Convert Stilbs to Foot-lamberts (sb to fL)
1 stilb (sb) = 2918.63508 foot-lamberts (fL). 1 fL = 0.00034262591 sb. Example: 15 sb = 15 × 2918.63508 = 43779.52619 fL.
Also searched as stilbs to fL, stilbs in fL, stilbs into foot-lamberts, sb to fL, sb in foot-lamberts, sb into foot-lambert, stilb to foot-lambert, sb to foot-lamberts converter and how many foot-lamberts in a stilb.
1 sb = 2918.63508 fL
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk stilb to foot-lambert converter to paste a column from Excel.
How to Convert Stilb to Foot-lambert
- 1 sb = 2918.63508 fL
- 1 fL = 0.00034262591 sb
- Example: convert 15 sb to fL: 15 sb = 15 × 2918.63508 fL = 43779.52619 fL
Formula
fL = sb × 2918.635079602
Derivation from SI units:
- 1 sb = 1 cd/cm² = 10⁴ cd/m².
- 1 fL = (1/π) cd/ft² ≈ 3.426 cd/m².
- 1 sb = 10000 cd/m² ÷ 3.426259099635 cd/m² per fL = 2918.635079602 fL
Both units are defined exactly, so the factor is exact. Stilb definition: stilb; Foot-lambert definition: foot-lambert.
Worked examples
- A reading of 2 sb converts to 5837.270159 fL.
2 sb × 2918.63508 = 5837.270159 fL - A value of 20 sb is 58372.70159 fL.
20 sb × 2918.63508 = 58372.70159 fL
Stilb to Foot-lambert conversion table
| Stilbs (sb) | Foot-lamberts (fL) |
|---|---|
| 0.1 sb | 291.863508 fL |
| 0.5 sb | 1459.31754 fL |
| 1 sb | 2918.63508 fL |
| 2 sb | 5837.270159 fL |
| 5 sb | 14593.1754 fL |
| 10 sb | 29186.3508 fL |
| 20 sb | 58372.70159 fL |
| 50 sb | 145931.754 fL |
| 100 sb | 291863.508 fL |
| 1000 sb | 2918635.08 fL |
Where it's used
Stilbs are used for older optics and lamp data, while foot-lamberts appear in cinema projection standards (DCI 14 fL). Both measure luminance (brightness of a surface or screen), so the conversion is a fixed factor.
Stilb to other luminance units
| Conversion | 1 sb equals |
|---|---|
| stilb to foot-lambert | 2918.63508 fL |
| stilb to nit | 10000 cd/m² |
| stilb to apostilb | 31415.92654 asb |
| stilb to candela per square foot | 929.0304 cd/ft² |
| stilb to candela per square inch | 6.4516 cd/in² |
| stilb to lambert | 3.141592654 L |
Frequently asked questions
How many foot-lamberts are in 1 stilb?
1 sb = 2918.63508 fL.
How do I convert stilbs to foot-lamberts?
Multiply the value in sb by 2918.63508. For example, 15 sb × 2918.63508 = 43779.52619 fL.
Is the sb to fL conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "stilb".
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "footlambert".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Stilbs to Foot-lamberts (sb to fL). Retrieved October 25, 2026, from https://scientificconverters.com/luminance/stilbs-to-foot-lamberts/
IEEE
Scientific Converters, "Convert Stilbs to Foot-lamberts (sb to fL)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/luminance/stilbs-to-foot-lamberts/