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Illuminance Converter – Convert Lux and Foot-Candles

Convert illuminance between lux, foot-candles, phot and nox.

Illuminance Converter What is this? ↓
About the Illuminance Converter

What is the Illuminance Converter?

An illuminance converter changes a light-level measurement between lux and imperial or CGS light units.

Why use this calculator?

Lighting design, photography and safety standards specify illuminance, sometimes in lux and sometimes in foot-candles.

How to use it

  1. Enter the illuminance value.
  2. Choose the source and target units.
  3. Read the converted illuminance.

Formula

One lux is one lumen per square meter; one foot-candle equals about 10.764 lux.
A typical office is lit to roughly 300–500 lux.
Frequently Asked Questions
How many lux is one foot-candle?
One foot-candle is about 10.764 lux.
How bright is daylight?
Overcast daylight is around 1,000 lux, while direct sunlight can exceed 100,000 lux.
How precise are the conversions?
Conversions use standard, internationally defined factors and are rounded for display. They are accurate to the number of digits shown.
Can I convert back and forth without losing accuracy?
Yes. Enter the original value to get an exact inverse conversion; avoid chaining rounded results if you need maximum precision.
Which measurement system is used?
Both metric (SI) and US customary / imperial units are supported and clearly labelled.
Is this calculator free to use?
Yes. Every calculator on this site is completely free, with no hidden fees, no subscriptions and no limits on how many times you can use it.
How accurate are the results?
We use standard, widely accepted formulas and calculate in your browser using double-precision arithmetic. Results are rounded for readability, so treat them as reliable estimates rather than a guarantee. Real-world factors can vary the true figure.
Can I add this calculator to my own website?
Yes. Open this calculator page and use the "Add to your website" box in the sidebar to copy a ready-made iframe snippet, then paste it into any HTML page.
Does it work on a phone or tablet?
Yes. The layout is fully responsive, so it works on desktops, laptops, tablets and mobile phones, and every input adapts to touch screens.
Is the information I type kept private?
Yes. All calculations run locally in your browser. Nothing you enter is uploaded, stored or shared with anyone.

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