Photometry Tools
Footcandles to Lux Calculator
Convert standard US unit footcandle (fc) illuminance to international metric lux (lx) quickly.
Calculation Input
Illuminance Equivalency
0.00 lx
Illuminance Class Target
Normal Office Reading
Exact Multiplication Factor
10.76391
Imperial vs Metric Light Density
Both footcandles ($fc$) and lux ($lx$) measure illuminance (light density hitting a surface). The difference is the scale: one footcandle equals one lumen per square foot, while one lux equals one lumen per square meter. Because 1 square meter is approximately $10.76391$ square feet, the formula is:
$$lx = fc \times 10.76391$$
To convert back from lux to footcandles, divide by the same constant: $fc = lx / 10.76391$.