Illuminance (Illumination) Converter
Illuminance is the amount of light falling on a surface per unit area. The SI unit is the lux, one lumen per square metre. One foot-candle, a lumen per square foot, is about 10.76 lux.
1 Lux = 0.09290304 Foot-candle
How to convert Lux to Foot-candle
One Lux equals 0.09290304 Foot-candle, so multiply any value in lx by 0.09290304 to get fc. To convert back, divide by 0.09290304 — or multiply by 10.76391042.
fc = lx × 0.09290304
Example: 25 lx × 0.09290304 = 2.322576 fc.
Lux to Foot-candle table
| Lux (lx) | Foot-candle (fc) |
|---|---|
| 1 | 0.09290304 |
| 2 | 0.18580608 |
| 3 | 0.27870912 |
| 4 | 0.37161216 |
| 5 | 0.4645152 |
| 10 | 0.9290304 |
| 15 | 1.3935456 |
| 20 | 1.8580608 |
| 25 | 2.322576 |
| 50 | 4.645152 |
| 75 | 6.967728 |
| 100 | 9.290304 |
| 250 | 23.22576 |
| 500 | 46.45152 |
| 1,000 | 92.90304 |
Foot-candle to Lux table
| Foot-candle (fc) | Lux (lx) |
|---|---|
| 1 | 10.76391042 |
| 2 | 21.52782083 |
| 3 | 32.29173125 |
| 4 | 43.05564167 |
| 5 | 53.81955208 |
| 10 | 107.6391042 |
| 15 | 161.4586563 |
| 20 | 215.2782083 |
| 25 | 269.0977604 |
| 50 | 538.1955208 |
| 75 | 807.2932813 |
| 100 | 1,076.391042 |
| 250 | 2,690.977604 |
| 500 | 5,381.955208 |
| 1,000 | 10,763.91042 |
Illuminance (Illumination) units at a glance
All 4 units this converter supports, each expressed in Lux (lx) and the other way round.
| Unit | Symbol | 1 unit in lx | 1 lx in unit |
|---|---|---|---|
| Lux | lx | 1 | 1 |
| Foot-candle | fc | 10.76391042 | 0.09290304 |
| Phot | ph | 10,000 | 0.0001 |
| Nox | nx | 0.001 | 1,000 |
Where illuminance (illumination) conversions are used
Lighting design (offices are typically lit to 300–500 lux), photography, horticulture, and workplace lighting standards.
Frequently asked questions
What is 1 Lux in Foot-candle?
1 Lux (lx) is 0.09290304 Foot-candle (fc).
What is 1 Foot-candle in Lux?
1 Foot-candle (fc) is 10.76391042 Lux (lx).
How do I convert Lux to Foot-candle?
Multiply the value in Lux by 0.09290304. For example, 5 lx × 0.09290304 = 0.4645152 fc. To go the other way, divide by 0.09290304.
How many units does the illuminance (illumination) converter support?
It converts between 4 units: Lux, Foot-candle, Phot, Nox.
More Light & Optics converters
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- Frequency-Wavelength ConverterConvert between electromagnetic frequency and wavelength (Hz ↔ nm)
Figures on this page are calculated with the same conversion factors as the converter above and shown to up to 10 significant figures. See our disclaimer before relying on a result in a professional or safety-critical context.