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Biology Calculators
Explore calculators across genetics, molecular biology, cell and microbial work, laboratory measurement, populations, ecology, evolution, microscopy, biochemistry and field sampling. Every calculator includes three complete clickable examples, a tailored visual before its inputs, an explicit equation and honest experimental boundaries.
20 biology collections146 available calculators
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Biology topics
Select a topic to reveal its calculators. Multiple topics can remain open at the same time.Genetics & InheritanceExplore transparent Mendelian probabilities, allele and genotype frequencies, pedigrees and Hardy-Weinberg expectations.6 available
- Punnett Square & InheritanceBuild one-, two- or three-locus crosses from parental genotypes. Inspect gametes, every combination, genotype probabilities and the chosen phenotype model.Open calculator
- Multiple-Offspring Inheritance ProbabilityCalculate exact-count and count-range probabilities from an entered per-offspring probability or a target genotype in a Mendelian cross.Open calculator
- X-Linked Inheritance ModelTrace one X-linked, two-allele locus through an XX × XY model cross. Keep within-XX, within-XY and all-offspring probabilities separate.Open calculator
- Educational Pedigree Genotype ProbabilityCombine entered parent relationships and genotype evidence in a small, one-locus educational pedigree. Show how evidence changes every member's genotype probabilities.Open calculator
- Observed Allele & Genotype FrequencyCount alleles from observed diploid genotypes or entered allele-copy totals. Compare records and calculate weighted pooled frequencies without assuming equilibrium.Open calculator
- Hardy–Weinberg Expectations & Exact ComparisonCalculate equilibrium genotype expectations from allele or genotype proportions, preserve ambiguous inverse solutions, or compare observed counts with a conditional exact test.Open calculator
DNA, RNA & ProteinInspect nucleotide sequences, transcription, translation, composition, reading frames and approximate molecular properties.9 available
- DNA-to-mRNA Strand-Aware TranscriptionConvert one declared DNA coding or template strand into a 5′→3′ mRNA record while retaining strand identity, direction and every supported IUPAC ambiguity symbol.Open calculator
- mRNA Reading-Frame TranslationTranslate one declared mRNA reading frame with NCBI standard code table 1, explicit stop handling, codon coordinates and ambiguity-aware amino-acid resolution.Open calculator
- Nucleic-Acid Complement and Reverse-ComplementGenerate same-order complements and 5′→3′ reverse complements for DNA or RNA while preserving every supported IUPAC ambiguity set.Open calculator
- DNA and RNA Sequence StatisticsAudit one DNA or RNA record for retained length, symbol frequencies and honest GC and AT/U intervals without assigning probabilities to IUPAC ambiguity codes.Open calculator
- DNA and RNA Sequence Molecular-WeightCalculate an average molecular weight from every base in one exact DNA oligonucleotide or RNA transcript and an explicitly selected terminal-chemistry model.Open calculator
- Protein Sequence Mass and CompositionCalculate average unmodified protein molecular weight and a complete amino-acid composition ledger from one exact standard-residue sequence.Open calculator
- Six-Frame Complete Open-Reading-Frame FinderFind every linear standard-code ATG-to-stop open reading frame across the three forward and three reverse-complement DNA frames, with exact input-strand coordinates and translations.Open calculator
- Codon Frequency and RSCU ComparisonCount complete codons in one or two declared coding records, calculate per-1,000 frequencies and relative synonymous codon usage, and expose every zero and trailing base.Open calculator
- Protein Isoelectric-Point ModelEstimate the pH of zero modeled net charge for one unmodified protein sequence and inspect every ionizable-group contribution at pI and a visitor-selected pH.Open calculator
PCR, qPCR & Molecular BiologyCalculate explicit primer, amplification, qPCR, copy-number, ligation and cloning-reaction relationships.10 available
- DNA Nearest-Neighbour Melting-TemperatureEstimate perfect-match DNA/DNA duplex melting with the SantaLucia unified nearest-neighbour parameters, explicit strand concentration, sodium-ion concentration, terminal terms and symmetry correction.Open calculator
- DNA and RNA Sequence StatisticsAudit one DNA or RNA record for retained length, symbol frequencies and honest GC and AT/U intervals without assigning probabilities to IUPAC ambiguity codes.Open calculator
- Primer-Pair Sequence-Property ComparisonCompare two exact DNA oligonucleotides under one declared nearest-neighbour sodium model and inspect exact reverse-complement tracts without issuing a compatibility verdict or annealing-temperature prescription.Open calculator
- Declared PCR Product BoundaryCalculate a linear or origin-crossing circular amplicon span from declared one-based inclusive product boundaries on a known template coordinate system.Open calculator
- Entered-Efficiency PCR Cycle ModelPropagate an entered starting-copy scenario through a declared number of cycles with one constant per-cycle amplification efficiency and retain a cycle ledger.Open calculator
- qPCR Standard-Curve Fit and QuantityFit Cq against entered log10 quantities, expose slope, intercept, residuals and R², derive the slope-based amplification factor, and optionally invert one Cq under that exact calibration.Open calculator
- qPCR ΔCq, ΔΔCq and Efficiency-Adjusted RatioRetain target and reference Cq records for one sample or a sample–calibrator comparison, then apply an explicitly selected equal-doubling or entered-efficiency relative-quantity convention.Open calculator
- DNA Mass-to-Molecule and Copy NumberConvert a declared total DNA mass or mass concentration into moles and molecules using an explicit approximate dsDNA, approximate ssDNA or exact entered molecular-mass basis.Open calculator
- Beer–Lambert ConcentrationSolve concentration, absorbance or molar extinction coefficient with explicit optical path length. Reconcile measured and original-sample concentration.Open calculator
- DNA Fragment Molar MixingConvert entered dsDNA fragment lengths and mass concentrations to fmol/µL, then calculate volumes for declared relative molar parts anchored to the first fragment's entered volume.Open calculator
Cell Biology & Cell CultureReconcile counts, viability, concentration, seeding, dilution, splitting, growth and doubling measurements.6 available
- Cell Count, Concentration & ViabilityReconcile chamber counts, counted volume and dilution. Keep total cells, assay-classified viable cells, concentration and whole-suspension yield distinct.Open calculator
- Cell Seeding Density & Volume PlannerTranslate your own viable-cell targets into stock aliquots for named vessel groups. Reconcile area, final volume, preparation allowance and available stock, or calculate densities from known aliquots.Open calculator
- Laboratory DilutionPlan a stock-to-working dilution, prepare an entered fold dilution, or recover a dilution factor from measured volumes. Keep stock, diluent and final volume separate.Open calculator
- Cell Culture Split RatioAllocate an entered fraction of a uniformly mixed cell suspension to multiple vessels. Reconcile stock used, material remaining and final suspension concentration.Open calculator
- Cell Population Doublings & Measured GrowthCalculate net population doublings, natural-log growth rates and doubling or halving times from measured totals. Compare intervals, correct for changing volumes, fit a chosen time window or reconcile passage records.Open calculator
- Confluency & Occupied AreaConvert recorded confluency to occupied area, pool measured regions by area, summarize image pixel counts or compare before/after coverage without treating it as a cell count.Open calculator
MicrobiologyWork with generation time, CFU, plate counts, dilution, growth and microbial-reduction records.8 available
- Cell Population Doublings & Measured GrowthCalculate net population doublings, natural-log growth rates and doubling or halving times from measured totals. Compare intervals, correct for changing volumes, fit a chosen time window or reconcile passage records.Open calculator
- Exponential Population ModelProject a constant-rate population, infer a starting value or rate, and find target times while keeping continuous growth separate from whole-period multiplication.Open calculator
- Colony Count & CFUReconcile plate counts across volumes and dilutions, normalize liquid or extracted samples, and keep zero and TNTC observations honest.Open calculator
- Serial Dilution Plate PlannerCompare expected plate counts from an entered stock estimate, cumulative dilution factors and plated volumes. Reconcile replicate plates with liquid demand.Open calculator
- Multiplicity & Ideal OccupancyKeep nominal infectious units per cell separate from an ideal Poisson occupancy model and from an observed occupied fraction.Open calculator
- Log & Percent ReductionCompare paired measured quantities, convert log and percent reductions, and preserve the direction and limits of nondetect results.Open calculator
- Most Probable Number ScenarioEstimate growth-unit concentration from positive and negative tube groups using an explicit Poisson dilution model. Retain all-negative and all-positive boundaries and label the uncertainty method.Open calculator
- Observed Decimal Reduction TimeCalculate endpoint or fitted D values from recorded time-course measurements, with an explicit fit window, residuals and limits for zero or censored data.Open calculator
Laboratory Dilution & QuantificationPlan biological dilution, working solutions, standards, absorbance, protein assays, normalization and master mixes.6 available
- Laboratory DilutionPlan a stock-to-working dilution, prepare an entered fold dilution, or recover a dilution factor from measured volumes. Keep stock, diluent and final volume separate.Open calculator
- Serial & Multi-Step Dilution PlannerBuild repeated or custom dilution steps and inspect every transfer, concentration and remaining tube volume. Catch a next transfer that exceeds the available mixture.Open calculator
- Linear Standard Curve & ConcentrationFit measured concentration–signal standards, inspect residuals and back-calculate multiple diluted samples. You can also use an existing validated linear calibration.Open calculator
- Beer–Lambert ConcentrationSolve concentration, absorbance or molar extinction coefficient with explicit optical path length. Reconcile measured and original-sample concentration.Open calculator
- Sample Loading & Concentration NormalizationPlan equal-mass sample loading or dilution to a common concentration. Reconcile sample, diluent and final volume for each entered stock.Open calculator
- Master Mix & Reagent ExcessScale a complete per-reaction recipe across samples and controls, with explicit excess and separately added components. Reconcile every reagent with the final reaction volume.Open calculator
Population BiologyCompare exponential and logistic population scenarios, growth rates, carrying capacity and life-table records.6 available
- Exponential Population ModelProject a constant-rate population, infer a starting value or rate, and find target times while keeping continuous growth separate from whole-period multiplication.Open calculator
- Logistic Population & Capacity ModelExplore an entered logistic population model, solve time or coefficient from compatible endpoints, and examine when a finite capacity can be inferred.Open calculator
- Population Change & Demographic LedgerReconcile consecutive population records with births, deaths, migration and explicit adjustments, keeping unexplained differences visible.Open calculator
- Stage & Age Population ProjectionProject an entered population vector through a fixed stage matrix, or separate survivor transitions and next-census recruitment, with inspectable contribution ledgers.Open calculator
- Cohort Survivorship RateSummarize fixed-cohort survival at a specified follow-up, with unequal cohort sizes and unknown status preserved. Distinguish a point-in-time fraction from a life table.Open calculator
- Closed Cohort Life Table SummaryBuild a time-resolved life table from complete counts of a closed cohort. Show interval losses, conditional survival and area under the recorded survivorship curve without extrapolating beyond follow-up.Open calculator
Ecology & BiodiversityCalculate richness, diversity, evenness, similarity, density and mark-recapture estimates with visible sampling assumptions.4 available
- Community DiversityInspect observed richness, Shannon entropy, Simpson indices and evenness from labelled taxa, with separate count and abundance-weight interpretations.Open calculator
- Community Taxon SimilarityCompare the recorded taxon identities of two communities using explicitly labelled Jaccard and Sørensen incidence similarities.Open calculator
- Mark–Recapture Population EstimateCompare two-occasion Chapman and Lincoln–Petersen estimates, with the observed overlap, distinct captures and model uncertainty kept separate.Open calculator
- Quadrat Sampling & Population DensityCombine quadrat counts using their sampled areas, compare field densities, and optionally scale the pooled density to an entered target area.Open calculator
Evolution & Population GeneticsModel selection, relative fitness, mutation, drift, fixation and inbreeding relationships without deterministic claims.9 available
- Declared Selection CoefficientCalculate a signed selection coefficient from an explicitly normalized relative-fitness value or from two comparable entered fitness components.Open calculator
- Relative Fitness NormalizationNormalize 2–20 comparable entered fitness components to either their observed maximum or a separate declared reference while preserving every raw value.Open calculator
- Mean Population Fitness ContributionWeight comparable type-specific fitness components by entered population frequencies or observed type counts and expose every contribution to the mean.Open calculator
- One-Generation Allele Frequency After SelectionApply entered AA, Aa and aa fitness components to either Hardy–Weinberg starting proportions or explicitly entered genotype frequencies for one deterministic weighting step.Open calculator
- Observed Mutant Frequency RecordCalculate record-level and pooled observed mutant proportions from explicit mutant and assayed-unit counts without relabelling the sample proportion as a mutation rate.Open calculator
- Mutation Event Rate and P₀ FluctuationCalculate either a direct externally identified mutation-event rate per declared opportunity or a limited zero-class fluctuation-test estimate with all model assumptions visible.Open calculator
- Genetic Drift Sampling SimulatorSimulate repeated neutral Wright–Fisher allele sampling with a recorded seed. Compare replicate trajectories and retain loss, fixation and ongoing variation as different outcomes.Open calculator
- Idealized Allele Fixation ProbabilityCompare the neutral eventual-fixation probability with a declared constant-size diploid diffusion scenario using entered initial frequency, effective size and genic selection coefficient.Open calculator
- Inbreeding Coefficient DefinitionKeep a heterozygosity-based within-population fixation index separate from an individual pedigree path coefficient, with each denominator and path contribution visible.Open calculator
Microscopy & Experimental DesignMeasure magnification, fields, scale bars, specimen size, plate volumes, replicates and reagent allowances.9 available
- Microscope Magnification & Optical Setup ComparisonCompare visual or camera optical setups, keep their magnification conventions separate, and solve the objective factor for an entered visual target.Open calculator
- Microscope Field of View & Specimen SpanFind a circular specimen-plane field from field number or a measured reference, solve a target field, and estimate a specimen span from its observed share of the diameter.Open calculator
- Microscope Numerical Aperture & Lateral Resolution ModelsCalculate an ideal lateral diffraction scale from numerical aperture or acceptance angle, distinguish Rayleigh and Abbe conventions, and inspect the NA implied by a target scale.Open calculator
- Microscope Scale Bar Length & Pixel PlannerPlan a calibrated scale bar, read the physical span of an existing bar, or recover its axis scale. Inspect whole-pixel alternatives, label error and fit against the final image extent.Open calculator
- Microscope Pixel Calibration & Physical Length ConverterEstablish horizontal and vertical specimen scales from a calibration image, known metadata or nominal sensor geometry; account for resizing, field extent and measured displacements.Open calculator
- Cell & Specimen Size Measurement LedgerConvert named image measurements into physical line lengths or areas, retain every record, and summarize the entered measurements without inferring cell shape or biological meaning.Open calculator
- Plate Well Volume PlannerAllocate working volumes to groups of wells, check entered well capacity, and calculate dispense volume, preparation excess and a separate reservoir allowance.Open calculator
- Experimental Replicate & Sample Requirement PlannerPlan independent experimental units, technical repeats and control measurements separately. Apply an entered attrition allowance without turning repeated measurements into independent samples.Open calculator
- Master Mix & Reagent ExcessScale a complete per-reaction recipe across samples and controls, with explicit excess and separately added components. Reconcile every reagent with the final reaction volume.Open calculator
Enzyme Kinetics & BiochemistryExplore Michaelis-Menten rates, linear transforms, activity, turnover, efficiency and entered inhibition scenarios.6 available
- Michaelis–Menten Rate & SubstrateCompare rates across substrate concentrations or solve the substrate concentration for an entered rate or fraction of Vmax.Open calculator
- Km & Vmax Curve FittingFit measured initial rates directly, or inspect explicit Lineweaver–Burk, Eadie–Hofstee and Hanes–Woolf linear fits with original-scale residuals.Open calculator
- Enzyme Activity & Specific ActivityConvert measured assay rates into activity per preparation volume, total activity and specific activity, with optional purification-stage comparisons.Open calculator
- kcat & Catalytic EfficiencyCalculate turnover from limiting rate and active catalytic centres, derive kcat/Km with molar units, and compare the full rate model with its low-substrate limit.Open calculator
- Reversible Enzyme InhibitionCompare uninhibited and inhibited rates for competitive, uncompetitive, pure noncompetitive or mixed models using explicit free-inhibitor scenarios.Open calculator
- Reaction Time-Window & Initial-RateFit a chosen part of a measured time course, subtract an entered blank drift and convert a calibrated signal slope to monitored-species rate.Open calculator
Electrophoresis & BlottingPlan gels, interpolate ladders, estimate fragment or protein size, load samples and normalize entered bands.7 available
- Agarose Gel ConcentrationSolve agarose mass, final preparation volume or mass-per-volume percentage. Distinguish grams per 100 mL from a mass fraction.Open calculator
- DNA Fragment Size & Migration CalibrationEstimate linear double-stranded DNA fragment sizes from a same-run ladder, or invert that calibration for an expected migration. Compare local interpolation with a declared log-linear fit and retain every sample result.Open calculator
- Gel Electrophoresis Voltage, Field & PowerRelate a supplied nominal field, electrode spacing and voltage. Optionally reconcile a measured current or entered resistance with electrical power and a constant-power energy scenario.Open calculator
- Electrophoresis Marker Run-Time & ProgressProject a named marker's position or time to an entered target using a supplied constant speed or a measured interval. Keep observed progress, future assumptions and already-passed targets visible.Open calculator
- SDS-PAGE Apparent Protein Mass & MigrationEstimate an apparent protein mass from matched SDS-PAGE standards using measured distances or relative migration Rf. Inspect local or fitted calibrations, residuals and expected migration for target masses.Open calculator
- Sample Loading & Concentration NormalizationPlan equal-mass sample loading or dilution to a common concentration. Reconcile sample, diluent and final volume for each entered stock.Open calculator
- Signal & Western Blot NormalizationNormalize background-corrected target bands to loading-reference signals and a control group, or compare already-normalized assay replicates with an entered reference group.Open calculator
Spectrophotometry & AssaysConvert calibrated absorbance and standard-curve measurements into transparent concentration and assay summaries.9 available
- Nucleic Acid AbsorbanceConvert corrected A260 into a mass concentration using an entered conversion factor, optical path and dilution. Calculate total recovered mass from the original sample volume.Open calculator
- DNA & RNA Absorbance RatioCalculate A260/A280 and A260/A230 for multiple DNA or RNA measurements. Inspect the underlying corrected absorbance values without automatic purity verdicts.Open calculator
- Optical Density DilutionPlan a dilution to an entered target optical density using either a required final volume or an available stock aliquot.Open calculator
- Bacterial Optical-Density Growth IntervalCalculate an apparent OD growth rate and doubling time from two readings or fit a user-chosen log-linear interval, while retaining blank correction, residuals and measurement limits.Open calculator
- Linear Standard Curve & ConcentrationFit measured concentration–signal standards, inspect residuals and back-calculate multiple diluted samples. You can also use an existing validated linear calibration.Open calculator
- ELISA Concentration from a 4PL CurveBack-calculate multiple ELISA samples from an entered four-parameter logistic calibration. Check asymptotes, the validated concentration interval and per-sample dilution.Open calculator
- Blank Corrected AbsorbanceSubtract the mean of entered blank measurements from multiple sample signals. Preserve signed differences and inspect blank variability.Open calculator
- Signal & Western Blot NormalizationNormalize background-corrected target bands to loading-reference signals and a control group, or compare already-normalized assay replicates with an entered reference group.Open calculator
- Detection & Quantitation Limit ScenarioCalculate SD-to-slope detection and quantitation estimates from entered response variability and multipliers. Keep estimates separate from validated assay limits.Open calculator
Flow Cytometry & Cell SortingReconcile events, nested gates, concentrations, compensation records, sort yield and recovery.6 available
- Flow Cytometry Gating and Event Percentage LedgerReconcile one or more nested flow-cytometry gates from entered event counts, preserving each immediate-parent percentage, starting-population percentage and excluded-event count.Open calculator
- Flow Cytometry Absolute Cell CountConvert an entered gated-event count into an absolute concentration by a measured acquisition volume or an entered counting-bead reference, with optional dilution reversal and whole-suspension extrapolation.Open calculator
- Flow Cytometry Spillover and CompensationCalculate a source-to-detector spillover coefficient, derive a conventional spillover matrix from entered single-stain summaries, or invert and apply an entered matrix to fluorescence observations.Open calculator
- Flow Cytometry Stain IndexCalculate one stain index from an explicit negative-population spread, use a separate P5-to-P95 percentile-width convention, or compare multiple entered records under one declared convention.Open calculator
- Flow Cytometry Proliferation IndexReconstruct precursor equivalents from entered dye-dilution generation amounts and keep FlowJo-style proliferation, division, precursor-frequency, expansion, replication and diluted-fraction metrics distinct.Open calculator
- Cell Sorting Yield & RecoveryReconcile starting target cells, sorter-reported deposited counts and physically recovered target cells while keeping yield, instrument-count recovery, viability and post-sort target fraction distinct.Open calculator
Bioinformatics & Sequence AnalysisCalculate sequence statistics, translations, identity, distance, explicit scores and restriction-fragment geometry.9 available
- DNA and RNA Sequence StatisticsAudit one DNA or RNA record for retained length, symbol frequencies and honest GC and AT/U intervals without assigning probabilities to IUPAC ambiguity codes.Open calculator
- Protein Sequence Mass and CompositionCalculate average unmodified protein molecular weight and a complete amino-acid composition ledger from one exact standard-residue sequence.Open calculator
- Dinucleotide Composition and Expected-FrequencyCount all 16 canonical dinucleotides in an overlapping, non-overlapping or circular record and compare observed frequencies with the retained windows' first- and second-position marginal expectations.Open calculator
- Protein Reverse-Translation DegeneracyMap every standard amino-acid residue to all synonymous NCBI table-1 codons, retain the exact combinatorial degeneracy and show a deterministic non-optimized representative record.Open calculator
- mRNA Reading-Frame TranslationTranslate one declared mRNA reading frame with NCBI standard code table 1, explicit stop handling, codon coordinates and ambiguity-aware amino-acid resolution.Open calculator
- Six-Frame Complete Open-Reading-Frame FinderFind every linear standard-code ATG-to-stop open reading frame across the three forward and three reverse-complement DNA frames, with exact input-strand coordinates and translations.Open calculator
- Pairwise Sequence Identity and Global AlignmentCompare equal-position records directly or construct one deterministic optimal global alignment with explicit match, mismatch, gap-open and gap-extension scores.Open calculator
- DNA Nearest-Neighbour Melting-TemperatureEstimate perfect-match DNA/DNA duplex melting with the SantaLucia unified nearest-neighbour parameters, explicit strand concentration, sodium-ion concentration, terminal terms and symmetry correction.Open calculator
- Linear and Circular Restriction-Digest MappingTurn entered interbase cut coordinates into exact fragment ledgers for linear or circular molecules and reconcile enzyme set A, set B and their combined double digest.Open calculator
Restriction Cloning & PlasmidsWork with restriction fragments, plasmid maps, insert ratios, assembly, transformation and colony-screening scenarios.6 available
- Linear and Circular Restriction-Digest MappingTurn entered interbase cut coordinates into exact fragment ledgers for linear or circular molecules and reconcile enzyme set A, set B and their combined double digest.Open calculator
- Cloning Colony & Insert Orientation Screening PlannerCombine entered insert, orientation and follow-up success assumptions. Estimate the chance of finding enough acceptable colonies or solve for a screening count.Open calculator
- DNA Fragment Molar MixingConvert entered dsDNA fragment lengths and mass concentrations to fmol/µL, then calculate volumes for declared relative molar parts anchored to the first fragment's entered volume.Open calculator
- Golden Gate Ordered Junction AuditRetain an entered linear or circular fragment order, verify its junction ledger, and flag literal duplicate, reverse-complement-reused, palindromic and extreme-composition 3- or 4-base overhangs without inventing a fidelity score.Open calculator
- Transformation Plate NormalizationNormalize one or more entered selective-plate colony counts for recovery volume, plated volume, pre-plating dilution and transformed DNA mass, then retain every plate-specific CFU/µg estimate.Open calculator
- Calibrated Plasmid Copy Number per CellInvert separate entered plasmid-target and chromosomal-reference qPCR calibration lines, then normalize their quantities by an entered reference-locus copies-per-cell convention.Open calculator
Immunology & Binding AssaysCalculate antibody dilution, equilibrium occupancy, kinetic constants, ELISA layouts and endpoint titres without clinical conclusions.6 available
- Laboratory DilutionPlan a stock-to-working dilution, prepare an entered fold dilution, or recover a dilution factor from measured volumes. Keep stock, diluent and final volume separate.Open calculator
- Binding Occupancy & Ligand BalanceCompare one-to-one binding from free or total ligand, or solve the free and total ligand concentrations for an entered occupancy target.Open calculator
- Binding Kd & BmaxEstimate equilibrium Kd from a specific-binding curve, measured free species and complex, or matched association and dissociation constants.Open calculator
- Binding Association & Dissociation KineticsCalculate one-site occupancy time courses, estimate kon and koff from observed relaxation rates, or fit a fixed-baseline dissociation trace.Open calculator
- ELISA Plate Layout PlannerAssign named blanks, standards, controls and sample replicates to a 24- or 96-well plate. Inspect every well and check the capacity before using the plan.Open calculator
- Endpoint Titre from Recorded DilutionsIdentify the highest tested dilution meeting an entered replicate rule. Keep bounded, all-negative, all-positive and nonmonotonic outcomes distinct.Open calculator
Plant Biology & PhotosynthesisSummarize leaf area, growth, assimilation, chlorophyll, stomatal density, germination and survival records.8 available
- Leaf Area MeasurementReconcile direct projected-area records, externally segmented image pixels or entered length–width coefficients into a labelled leaf-area ledger.Open calculator
- Specific Leaf Area RecordCalculate individual and pooled specific leaf area from matching projected leaf areas and oven-dry masses while keeping ratio averaging explicit.Open calculator
- Plant Relative Growth Rate IntervalCalculate a two-harvest log dry-mass rate or fit a deliberately selected series while retaining time order, mass records and log residuals.Open calculator
- Net Assimilation Rate Two-HarvestCalculate classical interval net assimilation rate from two comparable dry-mass and leaf-area harvests using a stable logarithmic mean area.Open calculator
- Chlorophyll Concentration from Entered CoefficientsApply a documented two-wavelength coefficient equation to chlorophyll a and b measurements. Reconcile dilution, extract volume and the entered sample mass.Open calculator
- Stomatal Density & IndexCalculate area-weighted stomatal density across microscope fields and, when separately counted, stomatal index relative to epidermal cells.Open calculator
- Germination PercentageSummarize germination counts across seed lots, preserving unassessed seeds and unequal lot sizes. Show both the assessed percentage and whole-lot bounds.Open calculator
- Seedling Survival RateReconcile initial seedlings with confirmed survivors and unknown follow-up status. Compare cohort percentages without equating missing seedlings with confirmed losses.Open calculator
Developmental & Comparative BiologyCompare stage duration, growth, allometric scaling, surface-area relationships and relative organ measurements.6 available
- Developmental Stage Duration RecordTurn explicitly staged start and end observations into record-level durations and stage-group summaries without fitting a thermal or developmental model.Open calculator
- Metamorphic Trait-Change RecordPreserve paired or comparable before-and-after trait records across a declared metamorphic transition, including signed loss, gain and interval log change.Open calculator
- Allometric Scaling RelationshipApply an entered reference power law or fit an equal-weight directional log–log relationship while keeping the anchor, exponent, residuals and unit dependence visible.Open calculator
- Biological Surface-Area-to-Volume GeometryCalculate external surface area, enclosed volume and linear-rescaling consequences for an explicitly chosen idealized geometry or entered measurements.Open calculator
- Organism Interval Growth ComparisonCompare positive-trait endpoint records over unequal intervals using signed absolute, proportional and natural-log rates while retaining every organism or cohort.Open calculator
- Relative Organ Size and Allometric ExpectationKeep a true same-quantity organ share separate from an observed-versus-expected allometric comparison and expose every entered reference term.Open calculator
Field Sampling & Experimental RecordsPlan capture, quadrat, transect, occupancy, detection, rarefaction, replicates, randomization and pooling records.10 available
- Mark–Recapture Population EstimateCompare two-occasion Chapman and Lincoln–Petersen estimates, with the observed overlap, distinct captures and model uncertainty kept separate.Open calculator
- Quadrat Sampling & Population DensityCombine quadrat counts using their sampled areas, compare field densities, and optionally scale the pooled density to an entered target area.Open calculator
- Transect Density & Encounter RateCalculate pooled encounter rate per kilometre or observed strip density using an explicitly measured full strip width. Preserve each transect's length and count.Open calculator
- Occupancy & Site Detection RecordSummarize repeated site visits, preserving detections, nondetections and missing surveys. Report observed site detection separately from model-estimated occupancy.Open calculator
- Detection Adjusted ObservationCompare observed counts divided by independently supplied inclusion probabilities. Preserve the observed counts, correction factors and hypothetical adjusted totals.Open calculator
- Biological Sampling EffortCompare sampling sessions by elapsed time, person-hours or exposure-unit hours. Preserve count and effort totals before calculating pooled encounter rate.Open calculator
- Individual-Based RarefactionCalculate expected taxon richness and conditional variation in a smaller random subset of genuine recorded individuals, without extrapolation.Open calculator
- Experimental Replicate & Sample Requirement PlannerPlan independent experimental units, technical repeats and control measurements separately. Apply an entered attrition allowance without turning repeated measurements into independent samples.Open calculator
- Reproducible Plate Randomization PlannerAssign named group replicates to a 24- or 96-well plate with a recorded seed. Choose complete-plate randomization or repeated group allocations within row blocks.Open calculator
- Biological Sample PoolingCombine measured stocks by entered volume or equal material contribution. Inspect each sample's contribution, available-volume constraint and the weighted pooled concentration.Open calculator