How many nox is one foot-candle?

1 foot-candle equals 10,763.91 nox. The calculation is: 1 fc = 10.76391041671 lux, and 1 lux = 1000 nox, so 1 fc = 10,763.91041671 nox.

The nox (nx) is a unit of illuminance equal to 0.001 lux (one millilux). It was created to describe very dim lighting conditions — such as a starlit night at roughly 1 nox — without using inconveniently small decimal fractions of lux. It is not an SI unit and is rarely used outside specialist photometry and older references.

What is a foot-candle?

A foot-candle (fc) is a unit of illuminance equal to one lumen per square foot. It remains common in photography, film production, and US building codes. One foot-candle equals approximately 10.764 lux.

When would I need this specific conversion?

This converter is useful when you have fc measurements from a US-standard light meter and need to express them in nox — for example, when documenting very dim environments, comparing with archaic European photometry data, or evaluating night-sky quality standards that use nox thresholds.

How do I convert nox back to foot-candles?

Divide the nox value by 10,763.91. For example, 1000 nox ÷ 10,763.91 ≈ 0.0929 fc. Alternatively, use the swap button in the converter above.

Foot-candles to Nox Converter

Enter a value in foot-candles and instantly get the equivalent in nox; 1 fc = 10,763.91 nox.

Illuminance Converter

Foot-candles (fc)

Nox (nx)

1 fc = 10,763.91 nx | 1 nx = 0.00009290 fc

Common Lighting Levels

Environment	fc	nox

Click any row to load that value into the converter.

Summary

This converter translates foot-candle measurements into nox in real time. One foot-candle equals approximately 10.76391 lux, and one lux equals 1000 nox, so 1 fc is approximately 10,763.91 nox. The nox is a non-SI unit designed for very dim lighting conditions such as starlight or moonless nights, where expressing illuminance in plain lux gives inconveniently small decimals. All calculation runs in your browser with no server call.

How it works

Enter the illuminance value in foot-candles (fc) in the input field.
The converter applies the factor 1 fc = 10,763.91041671 nox (derived from 1 fc = 10.76391 lx and 1 lx = 1000 nx).
The nox result appears instantly, formatted to a readable precision.
Use the swap button to convert nox back to foot-candles.
Click any row in the reference table to load that scenario into the converter.

Use cases

Translate photographic light meter readings in fc into nox for low-light analysis.
Compare very dim illuminance values from US-standard fc measurements against nox thresholds.
Convert astronomical or nature-reserve lighting specs between foot-candle and nox units.
Evaluate night-sky quality data that references nox levels against fc-based sensor readings.
Work with historical photometry literature that mixes fc and nox notation.
Check dim-light compliance values across American and archaic European unit systems.

Frequently Asked Questions

Last updated: 2026-07-14 · Reviewed by Nham Vu