Illuminance Converter

Illuminance Converter — Convert Lux, Foot-Candle, Lumens/m² Online

The Illuminance Converter is a free online tool that converts between every common illuminance unit: lux (SI standard), foot-candle (US Imperial), phot, nox, lumens per square meter, and lumens per square foot. Whether you are a lighting designer specifying office illumination, a photographer measuring scene brightness, an agronomist planning greenhouse grow lights, or a video producer setting up studio lighting, this converter handles the math instantly.

Why Illuminance Units Matter

Illuminance measures how much light falls on a surface, and standards vary by region and industry. US building codes specify office lighting in foot-candles; ISO standards use lux. Photography traditionally uses foot-candles for incident-light meter readings; modern digital meters often display lux. Horticulture grow-light specifications mix both. Converting accurately ensures your designs meet local codes, your photos are properly exposed, and your plants get the photons they need.

How to Use the Converter

Enter your illuminance value, select the source unit (lux or foot-candle are most common), and pick the target unit. The conversion appears instantly. The standard relationship is 1 foot-candle ≈ 10.764 lux, but the tool handles all unit combinations correctly with full precision.

Common Use Cases

Lighting designers translate architectural specs between metric and imperial markets. Photographers calibrate light meters in foreign units. Indoor farmers plan grow-light intensity. Video producers verify camera exposure settings. Building inspectors confirm code compliance. The tool is free, instant, mobile-friendly, runs entirely in your browser, and requires no signup.

Tamer Baghdadi

CEO / Co-Founder