Quick reference table
Common illuminance conversions
| From | To |
|---|---|
| 1 fc | 10.76391042 lx |
| 1 lx | 0.09290304000 fc |
| 1 ph | 10,000 lx |
| 1 klx | 1,000 lx |
| 1 lm/ft² | 10.76391042 lx |
How to convert illuminance
Illuminance is how much light falls on a surface. Lux is used for office and street lighting standards, while foot-candles are common in the United States.
Every illuminance unit is a fixed multiple of one base unit, the lx. To convert a value, multiply it by the size of the starting unit and divide by the size of the target unit. For example, to convert fc to lx, multiply by 10.76391042. To go the other way, divide by 10.76391042.
The converter above does this for you and shows the exact formula under the result.
Worked examples
Foot-candles to Lux
| Foot-candles (fc) | Lux (lx) |
|---|---|
| 1 fc | 10.76391042 lx |
| 2 fc | 21.52782083 lx |
| 5 fc | 53.81955208 lx |
| 10 fc | 107.6391042 lx |
| 25 fc | 269.0977604 lx |
| 50 fc | 538.1955208 lx |
| 100 fc | 1,076.391042 lx |
| 1,000 fc | 10,763.91042 lx |
Lux to Foot-candles
| Lux (lx) | Foot-candles (fc) |
|---|---|
| 1 lx | 0.09290304000 fc |
| 2 lx | 0.1858060800 fc |
| 5 lx | 0.4645152000 fc |
| 10 lx | 0.9290304000 fc |
| 25 lx | 2.322576000 fc |
| 50 lx | 4.645152000 fc |
| 100 lx | 9.290304000 fc |
| 1,000 lx | 92.90304000 fc |
Illuminance units explained
| Unit | Symbol | Equals |
|---|---|---|
| Lux | lx | 1 lx = 1 lx |
| Kilolux | klx | 1 klx = 1,000 lx |
| Foot-candles | fc | 1 fc = 10.7639104167 lx |
| Phot | ph | 1 ph = 10,000 lx |
| Lumens per square meter | lm/m² | 1 lm/m² = 1 lx |
| Lumens per square centimeter | lm/cm² | 1 lm/cm² = 10,000 lx |
| Lumens per square foot | lm/ft² | 1 lm/ft² = 10.7639104167 lx |
| Nox | nox | 1 nox = 0.001 lx |
Popular conversions: lux to foot candles, fc to lux.
Frequently asked questions
How many lux is a foot-candle?
One foot-candle is about 10.764 lux. To estimate, multiply foot-candles by 10.
How do I convert fc to lx?
Multiply the value in fc by 10.76391042 to get lx. For example, 10 fc = 107.6391042 lx.
How many lx is 1 fc?
1 fc = 10.76391042 lx, and 1 lx = 0.09290304000 fc.
Does this illuminance converter work offline?
Yes. After the page has loaded once, all calculations run in your browser, so it keeps working without an internet connection.