Lux to Footcandle Calculator

Lux to Foot-Candle Conversion

Lux and foot-candles both measure illuminance — how much light falls on a surface. Lux is the SI unit (lumens per square meter), while foot-candles are common in US lighting design (lumens per square foot). This calculator converts between them instantly in either direction.

Conversion Formula

$$1 \text{ foot-candle} = 10.764 \text{ lux}$$

To convert lux to foot-candles, divide by 10.764. To convert foot-candles to lux, multiply by 10.764.

Common Illuminance Levels

Office workspace: ~300–500 lux (28–46 fc)
Retail store: ~500–1000 lux (46–93 fc)
Direct sunlight: ~100,000 lux (~9,300 fc)

Frequently Asked Questions

What is the difference between lux and foot-candles?

Both measure illuminance. Lux uses square meters (SI), while foot-candles use square feet. One foot-candle equals 10.764 lux.

Which countries use foot-candles?

Foot-candles are most common in the United States. Most other countries use lux for lighting standards and specifications.

How do I convert lux to foot-candles?

Divide the lux value by 10.764. For example, 107.64 lux equals 10 foot-candles.

Is illuminance the same as brightness?

No. Illuminance measures light hitting a surface. Brightness (luminance) measures how bright a surface appears to an observer.

Can I use this for outdoor lighting?

Yes. The conversion applies at any illuminance level, from moonlight to direct sunlight.

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Lux to Foot-Candle Conversion

Conversion Formula

Common Illuminance Levels

Frequently Asked Questions

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