# Lux to Foot Candles Converter

URL: https://speedycalculator.com/calculators/physics/lux-to-footcandle/
Last updated: 2026-10-30

> The lux to foot-candles converter converts illuminance between lux (lumens per square metre) and foot-candles (lumens per square foot).

## Inputs

- Illuminance (lx, fc)

## Results

- Foot-candles
- Lux

## Formula

```
1 fc = 10.764 lx,  1 lx = 0.0929 fc
```

## Explanation

Lighting standards in the US often use foot-candles, while most of the world uses lux. Offices are usually lit to about 300–500 lx (30–50 fc); direct sunlight gives up to 100,000 lx.

### How to use the Lux to Foot Candles Converter

- **Illuminance**
- Every result field is editable: type into **Foot-candles** and **Illuminance** plus every other field update to match.

Results update as you type, every field has its own unit menu, and everything is calculated in your browser.

### How it works

Enter a value in either unit using the unit menu.

### Example values

How the main result changes when **Illuminance** changes and everything else stays at the example values above:

Illuminance (lx)Foot-candles (fc)25023.225837534.838650046.451562558.064475069.67731,00092.903

## Worked example

Inputs — Illuminance: 500 lx.

Results — **Foot-candles = 46.4515 fc**; Lux = 500 lx.

## Key terms

- **Foot-candle**: One lumen per square foot.

## FAQ

**How many lux is one foot-candle?**
10.764 lux.

**How bright is a typical office?**
300–500 lux.

**How bright is full daylight?**
10,000–100,000 lux.

**Why the factor 10.764?**
It is the number of square feet in a square metre.


## Sources

- [NIST – Fundamental physical constants](https://physics.nist.gov/cuu/Constants/)