Calculator category
Light & radiation Calculators
Convert light and radiation quantities, then solve photometry, optics, physical decay, counting, concentration, attenuation, and bounded time-distance-shielding workflows with explicit assumptions. Select the already determined photometric or radiation quantity and convert only its unit. Unit conversion cannot derive exposure, biological effect, perceived brightness, or safety limits.
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Light & radiation topics
Select a topic to reveal its calculators. Multiple topics can remain open at the same time.Light & radiationConvert light and radiation quantities, then solve photometry, optics, physical decay, counting, concentration, attenuation, and bounded time-distance-shielding workflows with explicit assumptions.19 available
- Illuminance ConverterConvert illuminance among lux, kilolux, foot-candles, and phot while keeping the incident-area basis explicit.Open calculator
- Luminance ConverterConvert candela-per-area, nit, foot-lambert, and lambert units.Open calculator
- Radioactivity ConverterConvert becquerels and curies across common metric scales.Open calculator
- Absorbed Radiation Dose ConverterConvert absorbed radiation dose among gray, milligray, microgray, and rad units.Open calculator
- Equivalent Radiation Dose ConverterConvert sievert, millisievert, microsievert, rem, and millirem units.Open calculator
- Lumen, Lux and Area CalculatorSolve total luminous flux, average illuminance, or illuminated area from the other two quantities, with square-metre and square-foot reconciliation.Open calculator
- Candela, Lumens and Beam Angle CalculatorSolve luminous intensity, luminous flux, or the full apex angle of an ideal uniform circular cone while exposing the cone solid angle.Open calculator
- Point-Source Illuminance and Distance CalculatorSolve illuminance, luminous intensity, distance, or incidence angle using the point-source inverse-square and cosine relationship.Open calculator
- Luminous Efficacy, Lumens and Power CalculatorSolve luminous efficacy, luminous flux, or input power and report the corresponding lumens-per-watt relationship without assigning a technology preset.Open calculator
- Lighting Measurement and Uniformity CalculatorSummarize an entered grid of illuminance measurements with minimum, maximum, mean, range, min-to-average, min-to-max, and optional target counts.Open calculator
- Display Contrast and Luminance Range CalculatorCalculate measured white-to-black contrast, luminance range, and stops, with an optional second measured condition for side-by-side comparison.Open calculator
- Radiant Power, Irradiance and Area CalculatorSolve radiant power, irradiance, or exposed area and optionally calculate radiant energy and radiant exposure over an entered duration.Open calculator
- Photon Energy, Wavelength and Frequency CalculatorSolve vacuum wavelength, frequency, or single-photon energy with exact SI constants and optionally convert radiant power into photon rate.Open calculator
- Radioactive Decay and Half-Life CalculatorSolve remaining activity, initial activity, elapsed time, or physical half-life and report decay constant, mean lifetime, fractions, half-lives elapsed, and integrated transformations.Open calculator
- Activity, Atoms and Isotope Mass CalculatorCalculate activity from entered atom count or isotope mass, physical half-life, molar mass, and isotopic fraction, with specific activity and atom-count reconciliation.Open calculator
- Radioactivity Concentration CalculatorSolve total activity, activity concentration, or sample quantity on a mass, volume, or area basis with compatible units enforced.Open calculator
- Radiation Count Rate, Background and Efficiency CalculatorCalculate gross, background, and net count rates, counting uncertainty, and efficiency-corrected activity from entered counts and measurement times.Open calculator
- Radiation Attenuation, HVL and TVL CalculatorSolve transmitted intensity, initial intensity, absorber thickness, or linear attenuation coefficient and report transmission, HVL, TVL, and attenuation lengths.Open calculator
- Radiation Time, Distance and Shielding Scenario CalculatorModel a point-source rate or accumulated dose using reference distance, scenario distance, time, occupancy, and entered shielding transmission or HVL count, with bounded reverse solves.Open calculator