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Math & Numbers

Luminance Converter (cd/m² / nit / foot-lambert / stilb)

· Last updated：2026-08-01

Convert luminance between cd/m² (nit, SI base), stilb (1 = 10000 cd/m²), cd/ft² (1 = 10.76391 cd/m²), foot-lambert (1 = 3.426263 cd/m²), apostilb (1 = 0.31831 cd/m²), lambert (1 = 3183.099 cd/m²), and millilambert (1 = 3.183099 cd/m²). All non-SI units except stilb carry a 1/π factor from Lambertian diffuse-emission assumptions. Reference values: LCD display ≈ 200–300, comfortable eye level ≈ 1000, sun surface ≈ 1.6×10⁹ cd/m².

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Written by the Elysia Tools team

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category
Math & Numbers
Input types
select, number
Output type
json
Sample coverage
4
API ready
Yes

Overview

Convert luminance values between cd/m² (nit), stilb, cd/ft², foot-lambert, apostilb, lambert, and millilambert. Enter a non-negative value, select the input and output units, and choose the required decimal precision.

When to use

  • Convert LCD or display brightness from cd/m² (nit) to foot-lambert or another luminance unit.
  • Compare photometry values reported in SI and traditional luminance units.
  • Check reference levels such as typical LCD brightness near 200–300 cd/m² or comfortable eye-level luminance near 1000 cd/m².

How it works

  1. 1Enter a non-negative luminance value in the Value field.
  2. 2Select the unit of the entered value, such as cd/m², nit, foot-lambert, or stilb.
  3. 3Choose the output unit for the converted result.
  4. 4Set Decimal Places from 0 to 10, then review the converted value and unit values in the JSON result.

Use cases

  • Display engineering teams can convert monitor brightness specifications between nits, cd/ft², and foot-lamberts.
  • Photometry students can compare SI and traditional luminance units using consistent conversion values.
  • HDR and screen calibration workflows can express a luminance reference such as 1000 cd/m² in apostilb, lambert, or millilambert.

Examples

1. Convert LCD brightness to foot-lamberts

Display technician

Background

A display specification lists brightness as 300 cd/m², while a reference document uses foot-lamberts.

Problem

Find the equivalent luminance in foot-lamberts.

How to use

Enter 300 as the value, select cd/m² (nit) as the input unit, choose foot-lambert as the output unit, and leave Decimal Places at 6.

{"inputUnit":"cd/m²","value":300,"outputUnit":"foot-lambert","decimalPlaces":6}

Outcome

The result is 87.558953 foot-lambert.

2. Convert 1000 nits to apostilb

HDR display specialist

Background

An HDR display reference uses 1000 cd/m², but the comparison uses apostilb.

Problem

Convert the luminance into apostilb without changing the source value.

How to use

Enter 1000 as the value, select cd/m² (nit) as the input unit, choose apostilb as the output unit, and set Decimal Places to 6.

FAQ

What is the base unit for this luminance converter?

cd/m², also called nit, is the SI base unit used for the conversion.

Which luminance units are supported?

The converter supports cd/m² (nit), stilb, cd/ft², foot-lambert, apostilb, lambert, and millilambert.

Can I convert display brightness from nits to foot-lamberts?

Yes. Select cd/m² (nit) as the input unit and foot-lambert as the output unit.

What value should I enter for a typical LCD display?

A typical LCD display is approximately 200–300 cd/m². For example, 300 cd/m² converts to about 87.558953 foot-lambert.

How many decimal places can the result use?

You can choose between 0 and 10 decimal places. The default is 6.

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{"inputUnit":"cd/m²","value":1000,"outputUnit":"apostilb","decimalPlaces":6}

Outcome

The result is 3141.593439 apostilb.