Authoritative definitions of the International System of Units and SI prefixes.
Dedicated unit pair
Stilbs to Foot-lamberts
Convert sb to fL instantly, then review the formula, assumptions, and rounding guidance.
Light & sound unitsInstant result
Decimals
Formula result = input × 10000 ÷ 3.4262590996. 1 sb = 2,918.6351 fL
Common examples
One value, several units
Candelas per square metre10,000 cd/m²
Nits10,000 nt
Foot-lamberts2,918.6351 fL
Conversion table
| sb | fL |
|---|---|
| 1 sb | 2,918.6351 fL |
| 2 sb | 5,837.2702 fL |
| 5 sb | 14,593.1754 fL |
| 10 sb | 29,186.3508 fL |
| 25 sb | 72,965.877 fL |
| 50 sb | 145,931.754 fL |
| 100 sb | 291,863.508 fL |
Conversion chart
1 sb2,918.6351 fL
5 sb14,593.1754 fL
10 sb29,186.3508 fL
25 sb72,965.877 fL
50 sb145,931.754 fL
Worked example
1 nit equals 1 cd/m².
Unit definition
Stilbs (sb) One stilbs equals 10,000 candela per square metre.
Unit history
Stilbs 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 sb to candela per square metre.
3. Convert the base value to fL and apply your display precision.
Understand the result before using it
Stilbs to Foot-lamberts converts a value measured in Stilbs (sb) into the equivalent value in Foot-lamberts (fL). 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 × 10000 ÷ 3.4262590996
Assumptions
- Stilbs and Foot-lamberts represent the same luminance quantity.
- The input is expressed in sb; the output is expressed in fL.
- The unit definitions and conventional relationship shown on this page apply.
Worked example
1 sb = 2,918.63507963 fL. 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 sb measurement in a document that expects fL.
- Compare a stilbs value with a value reported in foot-lamberts.
- Check the sb-to-fL 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 Stilbs to Foot-lamberts?
result = input × 10000 ÷ 3.4262590996 Using the displayed relationship, 1 sb equals 2,918.63507963 fL.
How many Foot-lamberts are in one Stilbs?
One Stilbs is 2,918.63507963 Foot-lamberts. The displayed digits may be rounded.
Can I reverse the sb to fL conversion?
Yes. Swap the source and target units in the converter. The reverse relationship converts fL back to sb.
Is the Stilbs to Foot-lamberts 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.