How to convert footcandles to watts

Written by james clark
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How to convert footcandles to watts
Foot-candles are a measurement of illumination that can be converted into watts. (

A foot-candle is a measurement of illumination equal to the light produced by one candle at a distance of one foot. A watt measures the rate of energy conversion, which can also be described as the speed at which something such as a candle or light bulb consumes energy. Converting foot candles to watts is easy, but requires an intermediate step, which involves converting foot-candles to lumens, abbreviated as lux. A lumen is another measurement of light power.

Skill level:


  1. 1

    Determine the number of foot-candles for the conversion into watts. For this example, the number of foot-candles is 50.

  2. 2

    Convert foot-candles into lumens. One foot-candle equals to 10.76 lumens. In this example, 50 foot-candles multiplied by 10.76 equals 538 lumens, or lux (50 x 10.76 = 538).

  3. 3

    Convert the lumens into watts. One lumen equals 0.001496 watts of energy per square meter. In this example, 538 lumens multiplied by 0.001496 equals 0.804808 watts.

  4. 4

    Use this formula for your own calculations: Number of foot-candles x 10.76 x 0.001496 to convert foot-candles into watts.

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