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Lighting Calculators

Lux Calculator

Illuminance in lux from lamp lumens and area, or the lumens needed for a target lux.

Enter values

Results update as you type.

Result

Illuminance

150 lux

In foot-candles
13.935
Suitable for
General living space
Area covered
20 m²

About the Lux Calculator

Illuminance in lux from lamp lumens and area, or the lumens needed for a target lux.

Also known as: illuminance calculator, lux from lumens, foot candles calculator, light level calculator.

How to use this calculator

  1. Enter calculate, area.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

lux = lumens ÷ area in m²

Worked example

Using the values pre-filled in the calculator above:

  • Calculate: Lux from lumens
  • Total lumens = 3,000
  • Area = 20 m²

the calculator returns:

  • Illuminance: 150 lux
  • In foot-candles: 13.935
  • Suitable for: General living space
  • Area covered: 20 m²