// multi-utility computation suite · offline · instant · precise
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eng.illuminance-inverse-square Calculator
Calculates illuminance (lux) at a point from a light source using the inverse square law and cosine law. Illuminance follows the inverse square law — doubling the distance from a source reduces illuminance to one-quarter.
Inputs
Luminous Intensity Cd
Reference formula or conversion factor shown for context.
Distance M
Separation between two points or total path length. Check that units are consistent throughout the calculation.
Angle Deg
Reference formula or conversion factor shown for context.
Reflectance Pct
Reference formula or conversion factor shown for context.
Results
illuminance E (lux)
Sample size or count used in the calculation.
luminance L (cd/m²)
Sample size or count used in the calculation.
footcandles
Sample size or count used in the calculation.
E = I·cos(θ)/d²
Reference formula or conversion factor shown for context.
typical targets
Reference formula or conversion factor shown for context.
daylight outdoor
Reference formula or conversion factor shown for context.