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Candela to Lux Calculator

Convert a point source luminous intensity (candela) and distance to illuminance (lux).

Input Data

Input Luminous intensity I.
cd
Input Distance d.
m

Results

250lx
E = I / d² = 1000 cd / 2² m² = 250.000000 lx

At a glance:Candela to Lux Calculator: enter parameters to compute results; complements related calculators.

Formula

E = I / d²

I: luminous intensity (cd), d: distance (m), E: illuminance (lx)

How to Use

  1. Enter luminous intensity I (candela).
  2. Enter distance d (meters).
  3. Get illuminance E (lux).

Case Studies

I = 10 cd, d = 2 m

E = 10 / 4 = 2.5 lx. Double the distance → quarter the illuminance.

FAQ

Inverse square law?

Point-source illuminance falls with the square of distance.

When valid?

For small (near-point) sources with normal incidence.

Related Tools

References

Content review: Calculatorism Science Team. Formula and numeric tests verified; results for reference only.

Found a problem with the results?

If this calculator's result is wrong, or you have any question about the calculation logic, please let us know. You are viewing:Candela to Lux Calculator（/light/candela-to-lux）。