Authoritative definitions of the International System of Units and SI prefixes.
Dedicated unit pair
Foot-candles to Lux
Convert fc to lx instantly, then review the formula, assumptions, and rounding guidance.
Light & sound unitsInstant result
Decimals
Formula result = input × 10.7639104167 ÷ 1. 1 fc = 10.7639 lx
Common examples
One value, several units
Lux10.7639 lx
Phot0.0011 ph
Nox10,763.9104 nx
Conversion table
| fc | lx |
|---|---|
| 1 fc | 10.7639 lx |
| 2 fc | 21.5278 lx |
| 5 fc | 53.8196 lx |
| 10 fc | 107.6391 lx |
| 25 fc | 269.0978 lx |
| 50 fc | 538.1955 lx |
| 100 fc | 1,076.391 lx |
Conversion chart
1 fc10.7639 lx
5 fc53.8196 lx
10 fc107.6391 lx
25 fc269.0978 lx
50 fc538.1955 lx
Worked example
1 foot-candle equals approximately 10.7639 lux.
Unit definition
Foot-candles (fc) One foot-candles equals 10.7639104167 lux.
Unit history
Foot-candles is represented here using its modern SI definition or an internationally accepted relationship to an SI base unit.
Step by step
1. Parse the value, including fractions.
2. Convert fc to lux.
3. Convert the base value to lx and apply your display precision.
Understand the result before using it
Foot-candles to Lux converts a value measured in Foot-candles (fc) into the equivalent value in Lux (lx). The numerical value changes because the size and definition of the selected unit changes; the underlying quantity does not.
Calculated result
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.
Formula, assumptions, and example
Formula
result = input × 10.7639104167 ÷ 1
Assumptions
- Foot-candles and Lux represent the same illuminance quantity.
- The input is expressed in fc; the output is expressed in lx.
- The unit definitions and conventional relationship shown on this page apply.
Worked example
1 fc = 10.7639104167 lx. For another value, apply the same relationship and round only to the precision your source measurement supports.
When to use it
Good uses
- Read a fc measurement in a document that expects lx.
- Compare a foot-candles value with a value reported in lux.
- Check the fc-to-lx arithmetic before copying the result into another calculation.
Limitations
Common mistakes to avoid
- Decibel sound-pressure level is logarithmic and depends on the stated reference pressure.
- Round the output to a precision justified by the original measurement.
- Verify safety-critical, regulated, laboratory, and contractual conversions against the controlling standard.
Sources and further reading
These references explain the underlying standards or provide authoritative context. Your own contract, institution, clinician, product documentation, local code, or governing standard may be the controlling source.
Guidance on unit names, symbols, conversions, and numerical presentation.
Questions about this calculation
How do I convert Foot-candles to Lux?
result = input × 10.7639104167 ÷ 1 Using the displayed relationship, 1 fc equals 10.7639104167 lx.
How many Lux are in one Foot-candles?
One Foot-candles is 10.7639104167 Lux. The displayed digits may be rounded.
Can I reverse the fc to lx conversion?
Yes. Swap the source and target units in the converter. The reverse relationship converts lx back to fc.
Is the Foot-candles to Lux result exact?
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.