Authoritative definitions of the International System of Units and SI prefixes.
Dedicated unit pair
Lux to Foot-candles
Convert lx to fc instantly, then review the formula, assumptions, and rounding guidance.
Light & sound unitsInstant result
Decimals
Formula result = input × 1 ÷ 10.7639104167. 1 lx = 0.0929 fc
Common examples
One value, several units
Foot-candles0.0929 fc
Phot0.0001 ph
Nox1,000 nx
Conversion table
| lx | fc |
|---|---|
| 1 lx | 0.0929 fc |
| 2 lx | 0.1858 fc |
| 5 lx | 0.4645 fc |
| 10 lx | 0.929 fc |
| 25 lx | 2.3226 fc |
| 50 lx | 4.6452 fc |
| 100 lx | 9.2903 fc |
Conversion chart
1 lx0.0929 fc
5 lx0.4645 fc
10 lx0.929 fc
25 lx2.3226 fc
50 lx4.6452 fc
Worked example
1 foot-candle equals approximately 10.7639 lux.
Unit definition
Lux (lx) One lux equals 1 lux.
Unit history
Lux 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 lx to lux.
3. Convert the base value to fc and apply your display precision.
Understand the result before using it
Lux to Foot-candles converts a value measured in Lux (lx) into the equivalent value in Foot-candles (fc). 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 × 1 ÷ 10.7639104167
Assumptions
- Lux and Foot-candles represent the same illuminance quantity.
- The input is expressed in lx; the output is expressed in fc.
- The unit definitions and conventional relationship shown on this page apply.
Worked example
1 lx = 0.0929030400001 fc. 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 lx measurement in a document that expects fc.
- Compare a lux value with a value reported in foot-candles.
- Check the lx-to-fc 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 Lux to Foot-candles?
result = input × 1 ÷ 10.7639104167 Using the displayed relationship, 1 lx equals 0.0929030400001 fc.
How many Foot-candles are in one Lux?
One Lux is 0.0929030400001 Foot-candles. The displayed digits may be rounded.
Can I reverse the lx to fc conversion?
Yes. Swap the source and target units in the converter. The reverse relationship converts fc back to lx.
Is the Lux to Foot-candles 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.