Authoritative definitions of the International System of Units and SI prefixes.
Dedicated unit pair
Foot-lamberts to Stilbs
Convert fL to sb instantly, then review the formula, assumptions, and rounding guidance.
Light & sound unitsInstant result
Decimals
Formula result = input × 3.4262590996 ÷ 10000. 1 fL = 0.0003 sb
Common examples
One value, several units
Candelas per square metre3.4263 cd/m²
Nits3.4263 nt
Stilbs0.0003 sb
Conversion table
| fL | sb |
|---|---|
| 1 fL | 0.0003 sb |
| 2 fL | 0.0007 sb |
| 5 fL | 0.0017 sb |
| 10 fL | 0.0034 sb |
| 25 fL | 0.0086 sb |
| 50 fL | 0.0171 sb |
| 100 fL | 0.0343 sb |
Conversion chart
1 fL0.0003 sb
5 fL0.0017 sb
10 fL0.0034 sb
25 fL0.0086 sb
50 fL0.0171 sb
Worked example
1 nit equals 1 cd/m².
Unit definition
Foot-lamberts (fL) One foot-lamberts equals 3.4262590996 candela per square metre.
Unit history
Foot-lamberts 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 fL to candela per square metre.
3. Convert the base value to sb and apply your display precision.
Understand the result before using it
Foot-lamberts to Stilbs converts a value measured in Foot-lamberts (fL) into the equivalent value in Stilbs (sb). 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 × 3.4262590996 ÷ 10000
Assumptions
- Foot-lamberts and Stilbs represent the same luminance quantity.
- The input is expressed in fL; the output is expressed in sb.
- The unit definitions and conventional relationship shown on this page apply.
Worked example
1 fL = 0.00034262590996 sb. 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 fL measurement in a document that expects sb.
- Compare a foot-lamberts value with a value reported in stilbs.
- Check the fL-to-sb 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-lamberts to Stilbs?
result = input × 3.4262590996 ÷ 10000 Using the displayed relationship, 1 fL equals 0.00034262590996 sb.
How many Stilbs are in one Foot-lamberts?
One Foot-lamberts is 0.00034262590996 Stilbs. The displayed digits may be rounded.
Can I reverse the fL to sb conversion?
Yes. Swap the source and target units in the converter. The reverse relationship converts sb back to fL.
Is the Foot-lamberts to Stilbs 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.