Lux to Foot Candles Converter
Convert between lux and foot candles - two common units for measuring illuminance
Illuminance Conversion Calculator
International standard unit (lumens per square meter)
US standard unit (lumens per square foot)
Conversion Results
Quick Reference Conversions
1 lux = 0.0929 foot candles
10 lux = 0.929 foot candles
100 lux = 9.29 foot candles
1000 lux = 92.9 foot candles
1 foot candle = 10.764 lux
10 foot candles = 107.64 lux
50 foot candles = 538.2 lux
100 foot candles = 1076.4 lux
Example Calculations
Office Lighting Example
Office illuminance requirement: 500 lux
Conversion to foot candles:
fc = 500 lx ÷ 10.76391 = 46.45 foot candles
Result: Office needs approximately 46.5 foot candles
Reading Light Example
Reading requirement: 30 foot candles
Conversion to lux:
lx = 30 fc × 10.76391 = 322.92 lux
Result: Need approximately 323 lux for comfortable reading
Common Illuminance Levels
Unit Comparison
Lux (lx)
- • International standard unit
- • Lumens per square meter
- • Used worldwide
- • Metric system unit
Foot Candles (fc)
- • US standard unit
- • Lumens per square foot
- • Common in North America
- • Imperial system unit
Understanding Illuminance Units
What is Illuminance?
Illuminance is the amount of light that falls on a surface per unit area. It measures how bright or dark a space feels and depends on both the light source's luminous flux (lumens) and the distance from the source.
Key Differences
- •Lux: Measures illuminance per square meter (SI unit)
- •Foot candles: Measures illuminance per square foot (Imperial unit)
- •1 square meter = 10.76391 square feet
Conversion Formulas
fc = lx ÷ 10.76391
lx = fc × 10.76391
Practical Applications
- •Architectural lighting design
- •Workplace safety standards
- •Photography and videography
- •Energy efficiency calculations
Relationship with Lumens
Both lux and foot candles are derived from lumens, which measure the total amount of light emitted by a source:
- •Lumens (lm): Total light output from a source
- •Lux (lx): Lumens per square meter (lm/m²)
- •Foot candles (fc): Lumens per square foot (lm/ft²)