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Illuminance Converter Calculator

Work out illuminance converter instantly with clear inputs, formula shown and shareable results.

About Illuminance Converter Calculator

Each illuminance unit is defined as a multiple of the lux, so the conversion runs in two steps: multiply by the source unit's factor to reach lux, then divide by the target unit's factor. One factor per unit covers every pair in the list. One lux is one lumen per square metre; the foot-candle is one lumen per square foot, hence the 10.764 factor.

Formulas

Two-step conversion

result = value × factor(from) ÷ factor(to)

Base value

base (lux) = value × factor(from)

Worked example

With the default values below, Illuminance Converter Calculator returns Converted Value of 46.451520. Change any input above and every figure here is recalculated in your browser.

Inputs used

Value
500
From unitone of Lux (lx), Foot-candle (fc), Phot (ph), Nox, Lumen per square metre
Lux (lx)
To unitone of Lux (lx), Foot-candle (fc), Phot (ph), Nox, Lumen per square metre
Foot-candle (fc)

Results

Converted Value
46.451520
Result Unit
Foot-candle (fc)
Value in lux (base)
500.000000
Multiplier Applied
0.09290304

Step by step

  1. 1Values used
  2. 2Two-step conversion
  3. 3Base value
  4. 4Converted Value= 46.451520
  5. 5Result Unit= Foot-candle (fc)
  6. 6Value in lux (base)= 500.000000
  7. 7Multiplier Applied= 0.09290304

Assumptions and limits

  • The result is derived only from the 3 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 8 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Why route through lux?

With 5 units, direct pairs would mean 20 factors to maintain. Going via lux needs one factor per unit and gives the same answer.

Does the dropdown order matter?

Yes. The first is the unit your figure is already in; the second is what you want it in. Swapping them inverts the result.

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