Light (illuminance) converter
Light (illuminance) Converter – 3 Units, Exact Factors
1 foot-candle = 10.764 lux
1 fc ≈ 10.76391 lx
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Results
- 1 fc = 10.764 lx
- 5 fc = 53.82 lx
- 10 fc = 107.64 lx
- 25 fc = 269.1 lx
From
- Luxlx
- Foot-candles (US)fc
- Photsph
To
- Lux10.764lx
- Foot-candles (US)1fc
- Phots0.0010764ph
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About light (illuminance) conversions
Lux and foot-candles.
Common light (illuminance) conversions
Light (illuminance) units explained
| Unit | System | Definition and notes |
|---|---|---|
| Lux (lx) | SI (metric) | Base unit |
| Foot-candle (fc) | US customary | 1 fc ≈ 10.76391 lxOne lumen per square foot, about 10.764 lux. |
| Phot (ph) | other | 1 ph = 10,000 lx (exact) |
Foot-candles to lux conversion table
| Foot-candles (fc) | Lux (lx) |
|---|---|
| 0.1 fc | 1.0764 lx |
| 0.5 fc | 5.382 lx |
| 1 fc | 10.764 lx |
| 2 fc | 21.528 lx |
| 3 fc | 32.292 lx |
| 4 fc | 43.056 lx |
| 5 fc | 53.82 lx |
| 6 fc | 64.583 lx |
| 7 fc | 75.347 lx |
| 8 fc | 86.111 lx |
| 9 fc | 96.875 lx |
| 10 fc | 107.64 lx |
| 15 fc | 161.46 lx |
| 20 fc | 215.28 lx |
| 25 fc | 269.1 lx |
| 30 fc | 322.92 lx |
| 40 fc | 430.56 lx |
| 50 fc | 538.2 lx |
| 75 fc | 807.29 lx |
| 100 fc | 1,076.4 lx |
| 250 fc | 2,691 lx |
| 500 fc | 5,382 lx |
| 1,000 fc | 10,764 lx |
Frequently asked questions
Which light (illuminance) units can I convert?
lux (lx), foot-candles (fc), phots (ph).
How accurate are the results?
Every unit is stored with its exact defining factor (NIST SP 811, NIST Handbook 44 or the BIPM SI Brochure). Calculations use double-precision arithmetic and are rounded only for display, to 5 significant figures by default (trailing zeros dropped, so 1 km shows as 1000 m). You can choose Auto (up to 10 digits), fixed decimals or more significant figures, or switch to scientific or engineering notation.