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

Luminance Converter (cd/m² / nit / foot-lambert / stilb) | Online Free Tool | Elysia Tools

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

1Enter a non-negative luminance value in the Value field.
2Select the unit of the entered value, such as cd/m², nit, foot-lambert, or stilb.
3Choose the output unit for the converted result.
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.

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

Run this tool

Examples that match this tool

Continue with connected tools and hubs

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

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Convert LCD brightness to foot-lamberts

2. Convert 1000 nits to apostilb

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