maratoolHow to convert lux to foot-candles
Type an illuminance — read lux, foot-candles, or phots instantly.
US lighting specs quote foot-candles while meters and international standards read lux. The Lux to Foot-Candles Converter applies the exact 10.7639 ratio both ways.
How it works
- Pick units — "Foot-candle (fc)" to "Lux (lx)", or any other pair.
- Type a value — the result updates as you type, with swap and copy.
- Copy — one click, with "Copied!" feedback.
Illuminance conversion factors
Every unit converts through the lux (the base unit). To convert A → B, multiply by A's factor and divide by B's:
| Unit | = this many luxs |
|---|---|
| Kilolux (klx) | 1,000 |
| Lux (lx) | 1 |
| Lumen per square meter (lm/m²) | 1 |
| Foot-candle (fc) | 10.76391041671 |
| Phot (ph) | 10,000 |
| Nox (nx) | 0.001 |
When you need it
Grow-light and photography charts mix the units freely: 50 fc for houseplants is 538 lx; a 500 lx office is 46.5 fc. For screen brightness (cd/m²), you want luminance, not illuminance.
Sources & methodology
Conversion factors follow NIST Special Publication 811; exact-by-definition factors are marked in the tool itself. All math runs client-side in your browser — nothing is uploaded.
More conversion guides
- How to convert nits to foot-lamberts (screen brightness)
- How to convert lumens, kilolumens, and cd·sr
- How to convert mcd to candela and candlepower
Or browse everything at once in the new unit & sizing converters roundup.