Nox to foot-candles
Type a value in nox to see it in foot-candles straight away, or type in the second box to convert back.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Type the value in the nox box.
- Read the result in foot-candles as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
fc = nx × 0.00009290304
Multiply the value in nox by 0.00009290304 to get foot-candles.
Example
To convert 25 nx to foot-candles: 25 × 0.00009290304 = 0.00232258 fc.
Conversion table
| Nox (nx) | Foot-candles (fc) |
|---|---|
| 1 | 0.000092903 |
| 2 | 0.000185806 |
| 3 | 0.000278709 |
| 5 | 0.000464515 |
| 10 | 0.00092903 |
| 20 | 0.00185806 |
| 25 | 0.00232258 |
| 50 | 0.00464515 |
| 100 | 0.0092903 |
| 250 | 0.0232258 |
| 500 | 0.0464515 |
| 1,000 | 0.092903 |
About the units
- Nox
- An old unit for very dim light equal to one millilux, exactly one thousandth of a lux.
- Foot-candle
- One lumen per square foot, exactly 10.763910416709722 lux, used in US lighting specifications.
Limits and caveats
- Results are rounded for display and computed with the browser's floating point precision (about 15 significant digits).
- Both unit factors are exact by their official definitions.
Questions about this tool
How many foot-candles are in one nox?
1 nx = 0.000092903 fc exactly.
How do I convert nox to foot-candles?
Use fc = nx × 0.00009290304. For example, 25 nx = 0.00232258 fc.
How many nox are in one foot-candle?
1 fc = 10,763.9 nx.
What is the difference between lux and lumens?
Lumens are the total light a lamp emits, while lux is how much of it lands on each square meter. A 1000 lumen lamp spread over 10 square meters gives 100 lux.
Why is a foot-candle about 10.764 lux?
A square foot is exactly 0.09290304 square meters, so one lumen per square foot equals 1 / 0.09290304 lumens per square meter.