Illumination / lx → fc
Convert Lux to Foot-candles
Convert illuminance on a surface between lux and foot-candles. Convert Lux (lx) to Foot-candles (fc). Find the formula, worked examples, unit definitions, and practical guidance below.
Reverse: Foot-candles to Lux →
How to convert lux to foot-candles
Illuminance is luminous flux per area, not radiant watts per area. One lux is one lumen per square meter. Photometric weighting prevents a universal lux-to-watts conversion.
Use x for the value in lx, b for the intermediate value in lx, and y for the result in fc.
fc = lx ÷ 10.763910416709722
Worked examples
10 lx ≈ 0.9290304 fc
Step 1: (10 × 1) ≈ 10 lx.
Step 2: 10 ÷ 10.7639104167 ≈ 0.9290304 fc.20 lx ≈ 1.8580608 fc
Step 1: (20 × 1) ≈ 20 lx.
Step 2: 20 ÷ 10.7639104167 ≈ 1.8580608 fc.
Results are rounded to 12 significant digits. Converting units does not increase the precision of the original measurement. Very large or small values outside JavaScript’s finite numeric range are rejected.
About Lux
Lux (lx) measures illumination under the conventions above. The base value in lx is (x × 1), where x is the numerical value in lx. Factors shown here are rounded for display; calculations use the stored factor.
About Foot-candles
Foot-candles (fc) measures illumination under the conventions above. The base value in lx is (x × 10.7639104167), where x is the numerical value in fc. Factors shown here are rounded for display; calculations use the stored factor.
Definitions and sources
Carry the same physical assumptions into subsequent physics calculations.
Lux to foot-candles reference table
| Lux (lx) | Foot-candles (fc) |
|---|---|
| 1 | 0.09290304 |
| 5 | 0.4645152 |
| 10 | 0.9290304 |
| 25 | 2.322576 |
| 50 | 4.645152 |
| 100 | 9.290304 |
| 1000 | 92.90304 |
Browse every illumination conversion →