Lux to Lumens Calculator
Determine total luminous flux by multiplying illuminance in lux by the lit area in square meters.
Assumes even light distribution across the area.
Examples
- 500 lux over 20 m² ⇒ 10,000 lumens
- 300 lux over 10 m² ⇒ 3,000 lumens
FAQ
What is lux?
Lux measures illuminance or light per unit area.
Why multiply by area?
Lumens quantify total light output; lux is lumens per square meter.
Does surface color matter?
This calculation assumes uniform reflection and ignores color.
Can I use feet²?
Convert feet² to m² before using this calculator.
Additional Information
- 1 lumen equals 1 candela·steradian.
- Typical office lighting ranges from 300–500 lux.
Relate photometry back to ISO 80000-2
Lumen calculations depend on steradians and standardized symbols. Learn how the standard defines these dimensionless quantities in the mathematical signs and symbols reference. Pair this converter with the academically styled candela, lumen, and lux articles to align intensity, flux, and illuminance concepts before documenting your results with ISO 80000-7 terminology. Dive further into solid-angle geometry with the steradian explainer and compare logarithmic lighting metrics with the decibel overview when your projects span photometry and acoustics.