Which illuminance units does this converter support?

It supports lux, kilolux, footcandle, phot, and nox.

What is the base unit for the conversion?

Lux is the SI base unit, equal to lumens per square metre (lm/m²).

Can I convert lux to footcandles?

Yes. For example, 500 lux equals approximately 46.451521 footcandles.

Does the result include other unit equivalents?

Yes. The result lists the equivalent value in all five supported units.

How many decimal places can I display?

You can choose from 0 to 10 decimal places.

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Illuminance Converter (lux / footcandle / phot / nox)

Convert illuminance between lux (lx = lm/m², SI base), kilolux (1 = 1000 lx), footcandle (1 = 10.7639104 lx), phot (1 = 10000 lx), and nox (1 = 0.001 lx). Converts via lux to the target unit and lists the equivalent value in all five units for reference. Reference values: full moon ≈ 0.25, office lighting ≈ 300–500, overcast day ≈ 1000, direct sunlight ≈ 100000 lux.

Execution

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2 examples

Office: 500 lux → footcandle ≈ 46.451521

500 lux ÷ 10.7639104 = 46.451521 fc. Standard office task lighting per WELL/LEED.

{"result":"500 lux = 46.451521 footcandle. All units: lux=500, kilolux=0.5, footcandle=46.451521, phot=0.05, nox=500000.","metadata":{"input":{"inputUnit":"lux","value":500,"outputUnit":"footcandle"},"result":{"outputValue":46.451521,"outputUnit":"footcandle","lux":500,"kilolux":0.5,"footcandle":46.451521,"phot":0.05,"nox":500000}}}

Direct sun: 100000 lux → kilolux = 100, phot = 10

100000 lux = 100 klx = 10 phot = 9290.304 fc. Bright direct sunlight on a clear day.

{"result":"100000 lux = 10 phot. All units: lux=100000, kilolux=100, footcandle=9290.304149, phot=10, nox=100000000.","metadata":{"input":{"inputUnit":"lux","value":100000,"outputUnit":"phot"},"result":{"outputValue":10,"outputUnit":"phot","lux":100000,"kilolux":100,"footcandle":9290.304149,"phot":10,"nox":100000000}}}

Inputs

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4 options

SettingsAdjust formats, ranges, numbers, and modes.4

Input unitselectOptionalValuenumberRequiredIlluminance in the selected Input unit. Must be non-negative.Output unitselectOptionalDecimal PlacesnumberOptional

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Illuminance Converter (lux / footcandle / phot / nox)

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Key facts

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Use cases

Examples

1. Convert office lighting to footcandles

2. Convert direct sunlight to phot

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