What is the base SI unit for illumination?

The primary reference unit for illumination in this converter is the Lux (lx). All 6 supported illumination units are anchored to this standard.

Are these illumination conversion factors verified?

Yes, all illumination conversion constants on UnitConvertersGo are verified against NIST Special Publication 811 and ISO/IEC 80000 international metrology standards.

Illumination Converter

Enter a value below to convert between metric, imperial, and standard illumination units.

Convert Illumination

Enter a value and select the units to convert between lux, kilolux, and millilux.

Instant conversion

Value

From

Result

0.01 klx

10 lx = 0.01 klx

10 lx = 0.01 klx = 10,000 mlxGet Widget

You can change the units using the dropdowns above or click on a unit button.

Suggested Conversions

Common Illumination Reference Points

Here are some common illumination values in Lux (lx), Kilolux (klx), and Millilux (mlx). Click any preset value or arrow to load it into the converter.

Description	Lux (lx)	Kilolux (klx)	Millilux (mlx)
1 lux unit	1	0.001	1,000
5 lux	5	0.005	5,000
10 lux benchmark	10	0.01	10,000
25 lux	25	0.025	25,000
50 lux	50	0.05	50,000
100 lux reference	100	0.1	100,000

Illumination Conversion Formulas

Use the following formulas to convert between lux, kilolux, and millilux.

Lux to Kilolux

klx = lx × 0.001

Kilolux to Lux

lx = klx × 1,000

Lux to Millilux

mlx = lx × 1,000

Example: Convert 10 Lux (lx) to Kilolux (klx)

1 lx = 0.001 klx

10 lx × 0.001 = 0.01 klx

All illumination conversions are anchored to the international SI base unit (Lux) for full scientific and engineering accuracy.

More Lux & Kilolux Conversions

Convert from Lux

Convert to Kilolux

Frequently Asked Questions

1 lux (lx) equals 0.001 kilolux (klx). Multiply your lux value by 0.001 or enter it in the Illumination Converter above for instant calculation.

Illumination Converter

Quick Info

Lux (lx) is a primary illumination unit used globally across science, commerce, and daily measurement.
Kilolux (klx) is widely used alongside lx for practical illumination specifications and conversions.
Lux (lx) serves as the standardized reference base unit anchoring all 6 units in this category.
Verified accuracy: All conversion factors follow official NIST SP 811 and ISO/IEC 80000 metrology constants.

Illumination Units Comparison

Lux (lx)

SI derived unit of illuminance (1 lumen per square meter).

Kilolux (klx)

Equal to 1,000 lux (outdoor daylight benchmark).

Millilux (mlx)

Low-light starlight/moonlight illuminance unit (0.001 lx).

References

[1]NIST · NIST HB 133 / SP 811
Source
[2]BIPM · BIPM SI-9
Source
[3]NIST SP 811 · NIST SP 811 App. B.9
Source

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All Illumination Conversion Calculators (6)

Select any dedicated illumination pair below for worked examples and printable tables

Lux to Kilolux (lx to klx)Kilolux to Lux (klx to lx)Lux to Millilux (lx to mlx)Millilux to Lux (mlx to lx)Lux to Foot-candles (lx to fc)Foot-candles to Lux (fc to lx)

Category Conversion Matrix

Simultaneous comparison of 6 units in this category

Lux (lx)

Kilolux (klx)

0.001

Millilux (mlx)

1,000

Foot-candle (fc)

0.0929

Phot (lm/cm²) (ph)

0.0001

Nox (nx)

1,000

Illumination Unit Definitions & Symbols

Lux (lx)

SI derived unit of illuminance (1 lumen per square meter).

Kilolux (klx)

METRIC

Equal to 1,000 lux (outdoor daylight benchmark).

Millilux (mlx)

METRIC

Low-light starlight/moonlight illuminance unit (0.001 lx).

Foot-candle (fc)

US CUSTOMARY

Architectural and photography lighting unit (1 lm/ft² ≈ 10.7639 lux).

Phot (lm/cm²) (ph)

METRIC

CGS illuminance unit equal to 10,000 lux.

Nox (nx)

METRIC

Dark-adapted illuminance unit equal to 1 millilux (0.001 lx).

References

NIST · BIPM · ISO

[1]
NIST (NIST HB 133 / SP 811)·Checking the Net Contents of Packaged Goods, Handbook 133 - 2019 Edition & NIST SP 811
NIST HB 133 Standard
[2]
BIPM (BIPM SI-9)·The International System of Units (SI Brochure, 9th Edition)
BIPM SI Brochure
[3]
NIST SP 811 (NIST SP 811 App. B.9)·NIST Guide to the SI, Appendix B.9: Factors for Units Listed by Kind of Quantity or Field of Science
NIST SP 811 Appendix B.9

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