Calculatorism

Lumens to Lux Calculator

Convert luminous flux (lumens) and lit area to average illuminance (lux).

Input Data

Input Luminous flux Φ.
lm
Input Area A.
m²

Results

80lx
E = Φ / A = 800 lm / 10 m² = 80.000000 lx

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

Formula

E = Φ / A

Φ: luminous flux (lm), A: area (m²), E: illuminance (lx)

How to Use

  1. Enter luminous flux Φ (lumens).
  2. Enter lit area A (m²).
  3. Get average illuminance E (lux).

Case Studies

Φ = 1000 lm, A = 10 m²

E = 1000 / 10 = 100 lx (about a desk-lighting level).

FAQ

Average illuminance?

Assumes flux is spread uniformly over area A.

Relation to candela?

For a point source E = I/d² is consistent with this.

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:Lumens to Lux Calculator（/light/lumens-to-lux）。