01
Length Converter
Converts between 15 length and distance units instantly, showing the exact conversion factor…
Illuminance Converter
Converts between 6 illuminance and light level units instantly, showing the exact conversion factor and a full reference table.
Converters
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No sign-up
Free, unlimited
Enter a value to convert.
In short
Illuminance Converter is a free online tool on inputtesthub.com that converts between 6 illuminance and light level 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 Illuminance 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 Illuminance Converter
The Illuminance Converter converts between 6 illuminance and light level 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 — Lux, Foot-candle, Phot, Nox, Lumen per square metre, Lumen per square foot and more |
|---|---|
| Base unit | Lux |
| 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
Are there any usage caps on the Illuminance Converter?
No charge and no sign-up. There is no free tier to run out of because there is no paid tier — inputtesthub.com is funded by advertising rather than by metering the tool.
Is the Illuminance Converter safe to use with private information?
No. The Illuminance Converter runs entirely in your browser using JavaScript. Because the work happens locally, the tool also keeps working if your connection drops, and closing the tab is all it takes to discard everything.
When would I actually need the Illuminance Converter?
In practice it gets used for three things: 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.
Is there anything the Illuminance Converter cannot do?
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.
What figures does the Illuminance Converter work from?
Units supported is 6 — Lux, Foot-candle, Phot, Nox, Lumen per square metre, Lumen per square foot and more. Base unit is Lux. 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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