Convert Stilbs to Candelas per Square Inch (sb to cd/in2)
1 stilb (sb) = 6.4516 candelas per square inch (cd/in²). 1 cd/in² = 0.15500031 sb. Example: 15 sb = 15 × 6.4516 = 96.774 cd/in².
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1 sb = 6.4516 cd/in²
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk stilb to candela per square inch converter to paste a column from Excel.
How to Convert Stilb to Candela per Square Inch
- 1 sb = 6.4516 cd/in²
- 1 cd/in² = 0.15500031 sb
- Example: convert 15 sb to cd/in²: 15 sb = 15 × 6.4516 cd/in² = 96.774 cd/in²
Formula
cd/in² = sb × 6.4516
Derivation from SI units:
- 1 sb = 1 cd/cm² = 10⁴ cd/m².
- 1 cd/in² = 1/0.00064516 cd/m² ≈ 1550 cd/m².
- 1 sb = 10000 cd/m² ÷ 1550.003100006 cd/m² per cd/in² = 6.4516 cd/in²
Both units are defined exactly, so the factor is exact. Stilb definition: stilb; Candela per Square Inch definition: candela per square inch.
Worked examples
- A reading of 2 sb converts to 12.9032 cd/in².
2 sb × 6.4516 = 12.9032 cd/in² - A value of 20 sb is 129.032 cd/in².
20 sb × 6.4516 = 129.032 cd/in²
Stilb to Candela per Square Inch conversion table
| Stilbs (sb) | Candelas per Square Inch (cd/in²) |
|---|---|
| 0.1 sb | 0.64516 cd/in² |
| 0.5 sb | 3.2258 cd/in² |
| 1 sb | 6.4516 cd/in² |
| 2 sb | 12.9032 cd/in² |
| 5 sb | 32.258 cd/in² |
| 10 sb | 64.516 cd/in² |
| 20 sb | 129.032 cd/in² |
| 50 sb | 322.58 cd/in² |
| 100 sb | 645.16 cd/in² |
| 1000 sb | 6451.6 cd/in² |
Where it's used
Stilbs are used for older optics and lamp data, while candelas per square inch appear in lamp and LED specifications. 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 candela per square inch | 6.4516 cd/in² |
| stilb to nit | 10000 cd/m² |
| stilb to foot-lambert | 2918.63508 fL |
| stilb to apostilb | 31415.92654 asb |
| stilb to candela per square foot | 929.0304 cd/ft² |
| stilb to lambert | 3.141592654 L |
Frequently asked questions
How many candelas per square inch are in 1 stilb?
1 sb = 6.4516 cd/in².
How do I convert stilbs to candelas per square inch?
Multiply the value in sb by 6.4516. For example, 15 sb × 6.4516 = 96.774 cd/in².
Is the sb to cd/in² conversion exact?
Yes. Both units are defined exactly, and 1 sb is exactly 6.4516 cd/in².
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, "candela per square inch".
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 Candelas per Square Inch (sb to cd/in2). Retrieved October 25, 2026, from https://scientificconverters.com/luminance/stilbs-to-candelas-per-square-inch/
IEEE
Scientific Converters, "Convert Stilbs to Candelas per Square Inch (sb to cd/in2)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/luminance/stilbs-to-candelas-per-square-inch/