Conversions
Illuminance Converter
Use the illuminance converter for lighting estimates, photography notes, and classroom unit conversions.
Converted value
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- Value in lux
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- Conversion rate
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Student quick launch
Grade planning, algebra checks, and formulas students reach for most.
Study path
Use this calculator with
Follow these when you want the formula behind the answer, a short lesson, or nearby tools in the same topic.
What the illuminance converter solves
Use the illuminance converter for lighting estimates, photography notes, and classroom unit conversions.
Formula
How to use it
- Enter the value to convert.
- Choose the source unit and target unit.
- Use the shown conversion rate to check the direction.
How to read the answer
The converted value uses lux as the shared bridge unit so every pair in this unit family stays consistent.
Common mistakes and edge cases
- Make sure the units belong to the same measurement family.
- Check whether your source uses decimal prefixes or binary-style prefixes.
- Round only the final answer when the exact conversion factor matters.
Worked examples
Default conversion
Converted value
538.195521 lux
Reverse direction
Converted value
4.645152 foot-candles
Frequently asked questions
What formula does the illuminance converter use?+
It converts the source value into a base unit, then divides by the target unit factor.
Why is the conversion rate shown?+
The rate makes it easier to verify that the calculator used the direction you intended.
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Last updated: May 15, 2026