Calculator category
Electrical Calculators
Use 63 professional tools for AC/DC power, conductors, raceways, loads, panels, motors, transformers, backup power, testing, lighting, EV charging, and field estimating. Move from measured or nameplate values to power, conductor, raceway, circuit, motor, transformer, lighting, backup-power, testing, and estimate checks. Local electrical rules remain required inputs.
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Electrical topics
Select a topic to reveal its calculators. Multiple topics can remain open at the same time.ElectricalUse 63 professional tools for AC/DC power, conductors, raceways, loads, panels, motors, transformers, backup power, testing, lighting, EV charging, and field estimating.63 available
Core Electrical & AC Power
- Ohm's Law CalculatorSolve voltage, current, resistance, and power from any supported pair of electrical quantities.Open calculator
- Electrical Power CalculatorSolve real power or load current for DC, single-phase AC, or balanced three-phase AC.Open calculator
- Voltage Drop CalculatorCalculate resistive/reactive voltage drop, receiving voltage, percentage drop, and conductor loss from measured cable data.Open calculator
- Power Factor and Power Triangle CalculatorReconcile real, apparent, and reactive power, power factor, and phase angle from a supported pair.Open calculator
- Three-Phase Line and Phase CalculatorConvert line and phase voltage/current for balanced wye or delta connections.Open calculator
- Electrical Energy and Operating Cost CalculatorEstimate energy, demand, operating cost, and annualized use for repeated electrical loads.Open calculator
- Series and Parallel Resistance CalculatorCalculate equivalent resistance, total current, and branch current or voltage for up to four resistors.Open calculator
- Voltage and Current Divider CalculatorCalculate an unloaded or loaded two-resistor voltage divider, or a two-branch current divider.Open calculator
- AC Impedance CalculatorCalculate series RLC impedance, phase angle, current, power factor, and real/reactive power at an entered frequency.Open calculator
- RLC Resonance CalculatorCalculate ideal series resonance, reactance at resonance, characteristic impedance, and quality factor.Open calculator
Conductors, Cable & Raceway
- Wire Resistance CalculatorCalculate conductor resistance, voltage drop, and I²R loss from resistivity, length, area, temperature correction, and parallel runs.Open calculator
- Required Conductor Size CalculatorCalculate a resistive, unity-power-factor minimum conductor area from allowable voltage drop, resistivity, length, current, phase, and parallel paths.Open calculator
- AWG, kcmil and mm² ConverterConvert conductor area among AWG, kcmil, circular mils, diameter, and square millimetres, including 00 through 0000 AWG.Open calculator
- Maximum Circuit Length CalculatorCalculate maximum one-way circuit length for entered conductor resistance, reactance, load character, and allowable voltage drop.Open calculator
- Cable Power Loss CalculatorCalculate conductor I²R loss, delivered power, efficiency, and energy cost for DC, single-phase, or balanced three-phase circuits.Open calculator
- Parallel Conductor CalculatorCalculate total area, equivalent resistance, current sharing, and loss for equal conductors in parallel per path.Open calculator
- Cable Ampacity Adjustment CheckerApply visitor-entered temperature, grouping, installation, and additional correction factors to a verified base ampacity.Open calculator
- Conduit Fill CalculatorCalculate raceway fill from up to four cable or conductor groups and compare it with a visitor-entered permitted fill percentage.Open calculator
- Cable Tray Fill CalculatorCalculate tray occupancy and permitted spare width or area against visitor-entered limits.Open calculator
- Electrical Box Fill CheckerTotal visitor-entered conductor, device, clamp, connector, and bonding volume allowances and compare them with box volume.Open calculator
- Pull Box and Junction Box Size CheckerCompare proposed pull-box dimensions with visitor-entered minimum dimensions from the selected code rule.Open calculator
- Conduit Bend and Offset CalculatorLay out equal-bend conduit offsets from offset, angle, and visitor-entered shrink multiplier.Open calculator
- Cable Pull Length and Waste CalculatorEstimate cable purchase length across repeated runs, vertical allowance, tails, and entered waste.Open calculator
Loads, Circuits & Panels
- Electrical Load Schedule CalculatorBuild a compact load schedule from four load groups with quantity, VA per item, power factor, and demand factor.Open calculator
- Demand and Diversity CalculatorApply visitor-entered demand factors to load groups and report coincident demand, the inverse connected-to-demand ratio, and spare capacity.Open calculator
- Continuous and Noncontinuous Load CalculatorApply visitor-entered multipliers to continuous and noncontinuous loads without assuming a jurisdiction.Open calculator
- Branch Circuit Capacity CheckerCompare design current with visitor-entered conductor ampacity, protective-device rating, and equipment terminal limit.Open calculator
- Feeder Load CalculatorCombine four downstream demand loads, an entered growth allowance, and feeder voltage/phase into required kVA and current.Open calculator
- Panel Phase Balance CalculatorCompare three phase loads and model moving one entered single-phase load between phases.Open calculator
- Panel Capacity and Spare Capacity CalculatorCompare panel/service capacity with connected load, demand factor, and entered reserve allowance.Open calculator
- Three-Phase Neutral Current CalculatorCalculate the fundamental-frequency neutral-current magnitude from three phase currents and entered phase angles.Open calculator
Motors & Drives
- Motor Full-Load Current CalculatorEstimate motor line current from shaft power, voltage, phase, efficiency, and power factor.Open calculator
- Motor Electrical Input and Shaft Output CalculatorCalculate motor input power, shaft output, efficiency loss, loading, and horsepower from measured electrical quantities.Open calculator
- Motor Efficiency CalculatorCalculate motor efficiency, loss, and annual loss energy from measured electrical input and shaft output.Open calculator
- Motor Torque CalculatorCalculate torque from shaft power and rotational speed, or shaft power from torque and speed.Open calculator
- Synchronous Speed and Motor Slip CalculatorCalculate AC motor synchronous speed, measured slip speed, slip percentage, and rotor frequency.Open calculator
- Motor Starting Current and kVA CalculatorEstimate motor starting current and starting kVA from full-load current or entered locked-rotor multiplier.Open calculator
- Motor Starting Voltage-Dip EstimatorEstimate source-bus voltage dip from motor starting kVA and visitor-entered source short-circuit capacity.Open calculator
- VFD Frequency and Motor Speed CalculatorEstimate induction-motor speed from VFD frequency, pole count, and entered slip, or solve required frequency for a target speed.Open calculator
- Motor Energy Savings CalculatorCompare annual input energy and cost for a more-efficient motor at the same shaft load and schedule.Open calculator
Transformers, Generators & Backup Power
- Transformer kVA and Current CalculatorSolve transformer kVA or line current and report both primary and secondary currents for single- or three-phase units.Open calculator
- Transformer Turns and Voltage Ratio CalculatorCalculate ideal transformer voltage, turns, current, and impedance ratios from either winding data.Open calculator
- Transformer Loading and Spare Capacity CalculatorCalculate transformer loading, spare kVA, derated capacity, and overload from nameplate and demand data.Open calculator
- Transformer Secondary Fault-Current EstimateEstimate transformer-terminal symmetrical secondary fault current from kVA, secondary voltage, nameplate impedance, and an optional upstream impedance already converted to the transformer base.Open calculator
- Generator kVA Sizing WorksheetCombine running loads, visitor-entered starting kVA, coincidence, reserve, and power factor into a generator planning requirement.Open calculator
- UPS Sizing and Runtime CalculatorEstimate UPS apparent-power requirement, battery energy, and idealized runtime from load, PF, reserve, efficiency, and battery data.Open calculator
- Battery Bank Capacity CalculatorCalculate required nominal amp-hours and series/parallel battery count for a compatible exact-voltage DC module configuration.Open calculator
- Battery Runtime CalculatorEstimate idealized battery runtime from nominal voltage, capacity, usable fraction, conversion efficiency, and load.Open calculator
- DC Inverter Load and Battery Current CalculatorCalculate inverter DC input current and AC apparent load, plus idealized runtime when battery capacity data is entered.Open calculator
Testing, Diagnostics & Power Quality
- Three-Phase Voltage Unbalance CalculatorCalculate average phase-to-phase voltage, maximum-deviation voltage unbalance, and deviation by phase.Open calculator
- Three-Phase Current Unbalance CalculatorCalculate average phase current, maximum-deviation current unbalance, and phase deviations from three measurements.Open calculator
- Power Factor Correction Capacitor CalculatorCalculate ideal fundamental-frequency capacitor-bank kVAR needed to move from an existing lagging power factor to a target power factor.Open calculator
- Total Harmonic Distortion CalculatorCalculate voltage or current THD from a fundamental RMS value and up to six entered harmonic RMS components.Open calculator
- Crest Factor CalculatorCalculate waveform crest factor from measured peak and RMS magnitude and compare it with an entered reference.Open calculator
- Insulation Resistance PI and DAR CalculatorCalculate polarization index and dielectric absorption ratio from timed insulation-resistance readings.Open calculator
- Fault Loop Impedance and Prospective Fault Current CalculatorCalculate prospective fault current from measured/entered loop voltage and impedance, and compare disconnection current requirements.Open calculator
- Current Transformer Ratio CalculatorCalculate CT secondary current, primary current, ratio, and required primary turns for a low-current measurement.Open calculator
- Current Transformer Burden CalculatorCalculate CT secondary burden from connected resistance/current or entered VA and compare it with the CT rated burden.Open calculator
Lighting, EV & Field Estimating
- Illuminance CalculatorCalculate average illuminance from luminaire quantity, lumens, utilization, maintenance, and illuminated area.Open calculator
- Required Luminaire Quantity CalculatorCalculate whole luminaires required for a target average illuminance and report installed maintained illuminance.Open calculator
- Lighting Circuit Load CalculatorCalculate connected lighting watts, AC apparent load, circuit current, energy, and entered-capacity margin for DC, single-phase, or balanced three-phase circuits.Open calculator
- EV Charging Power and Time CalculatorCalculate AC charging power, ideal battery energy need, wall energy, charging time, and entered-circuit utilization.Open calculator
- Electrical Material Takeoff CalculatorEstimate cable, conduit, boxes, devices, and optional entered cost for repeated circuit runs.Open calculator