01
Length Converter
Converts between 15 length and distance units instantly, showing the exact conversion factor…
Luminance Converter
Converts between 6 luminance and screen brightness units instantly, showing the exact conversion factor and a full reference table.
Converters
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Free, unlimited
Enter a value to convert.
In short
Luminance Converter is a free online tool on inputtesthub.com that converts between 6 luminance and screen brightness units instantly, showing the exact conversion factor and a full reference table. It needs no account, no download and no payment, and there is no daily usage limit. Everything is processed inside your own browser, so the data you paste is never uploaded to a server.
How to use the Luminance Converter
- Type the value you want to convert.
- Pick the unit you are converting from and the unit you want.
- The converted value and the exact conversion factor are shown instantly.
About the Luminance Converter
The Luminance Converter converts between 6 luminance and screen brightness units instantly, showing the exact conversion factor and a full reference table. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.
What people use it for
- Converting a measurement between metric and imperial without guessing.
- Checking a factor before using it in a spreadsheet or a piece of code.
- Reading a specification written in units you do not normally work in.
Details
| Units supported | 6 — Candela per square metre (nit), Nit, Foot-lambert, Lambert, Stilb, Apostilb and more |
|---|---|
| Base unit | Candela per square metre (nit) |
| Precision | Calculated in double precision and shown to 10 significant figures, so round-tripping a value returns the original |
Where this tool stops
Conversion factors here are the exact internationally defined values where one exists (an inch is exactly 25.4 mm, a pound is exactly 0.45359237 kg). Units defined by physical conditions — Mach number, atmospheric pressure, a "month" — depend on context and are marked in the table.
Frequently asked questions
Is there a limit on how often I can use the Luminance Converter?
It is free, with no account, no trial and no daily cap. Every converters tool on inputtesthub.com works the same way: open the page and use it.
Is the Luminance Converter safe to use with private information?
No. The Luminance Converter runs entirely in your browser using JavaScript. Nothing is transmitted, logged or stored, which you can verify yourself in the Network tab of your browser's developer tools.
Who is the Luminance Converter for?
The most common reasons people reach for it: converting a measurement between metric and imperial without guessing. Checking a factor before using it in a spreadsheet or a piece of code. Reading a specification written in units you do not normally work in. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
When is the Luminance Converter not the right tool?
Conversion factors here are the exact internationally defined values where one exists (an inch is exactly 25.4 mm, a pound is exactly 0.45359237 kg). Units defined by physical conditions — Mach number, atmospheric pressure, a "month" — depend on context and are marked in the table. Knowing where a tool stops being trustworthy matters more than the cases where it works.
Which values should I know?
Units supported is 6 — Candela per square metre (nit), Nit, Foot-lambert, Lambert, Stilb, Apostilb and more. Base unit is Candela per square metre (nit). Precision is Calculated in double precision and shown to 10 significant figures, so round-tripping a value returns the original. These are printed on the page itself, so you do not have to take them on trust.
Can I rely on this for exact work?
The calculation runs in double precision and the result is shown to ten significant figures, so converting a value and converting it back returns the original. What is displayed is rounded for readability; what is copied is not.
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