Lux and Foot-Candles
Lux and foot-candles both measure illuminance — the amount of light falling on a surface — but in different unit systems. One foot-candle equals one lumen per square foot, while one lux equals one lumen per square meter. Since a square meter contains 10.7639 square feet, 1 foot-candle = 10.7639 lux.
To convert lux to foot-candles, simply divide by 10.7639. This exact factor comes from the geometric conversion between square meters and square feet, so the result is precise regardless of the light source.
Last reviewed August 2026