Lighting standards in the US often use foot-candles, while most of the world uses lux. Offices are usually lit to about 300–500 lx (30–50 fc); direct sunlight gives up to 100,000 lx.
How to use the Lux to Foot Candles Converter
- Illuminance
- Every result field is editable: type into Foot-candles and Illuminance plus every other field update to match.
Results update as you type, every field has its own unit menu, and everything is calculated in your browser.
How it works
Enter a value in either unit using the unit menu.
Example values
How the main result changes when Illuminance changes and everything else stays at the example values above:
| Illuminance (lx) | Foot-candles (fc) |
|---|---|
| 250 | 23.2258 |
| 375 | 34.8386 |
| 500 | 46.4515 |
| 625 | 58.0644 |
| 750 | 69.6773 |
| 1,000 | 92.903 |
Formula
1 fc = 10.764 lx, 1 lx = 0.0929 fc
Worked example
Inputs — Illuminance: 500 lx.
Results — Foot-candles = 46.4515 fc; Lux = 500 lx.
Key terms
- Foot-candle
- One lumen per square foot.
Frequently asked questions
How many lux is one foot-candle?
10.764 lux.
How bright is a typical office?
300–500 lux.
How bright is full daylight?
10,000–100,000 lux.
Why the factor 10.764?
It is the number of square feet in a square metre.