Convert Apostilbs to Stilbs (asb to sb)
1 apostilb (asb) = 0.00003183098862 stilbs (sb). 1 sb = 31415.92654 asb. Example: 15 asb = 15 × 0.00003183098862 = 0.0004774648293 sb.
Also searched as apostilbs to sb, apostilbs in sb, apostilbs into stilbs, asb to sb, asb in stilbs, asb into stilb, apostilb to stilb, asb to stilbs converter and how many stilbs in an apostilb.
1 asb = 0.00003183098862 sb
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk apostilb to stilb converter to paste a column from Excel.
How to Convert Apostilb to Stilb
- 1 asb = 0.00003183098862 sb
- 1 sb = 31415.92654 asb
- Example: convert 15 asb to sb: 15 asb = 15 × 0.00003183098862 sb = 0.0004774648293 sb
Formula
sb = asb × 0.00003183098861838
or sb = asb ÷ 31415.9265359
Derivation from SI units:
- 1 asb = (1/π) cd/m² ≈ 0.3183 cd/m².
- 1 sb = 1 cd/cm² = 10⁴ cd/m².
- 1 asb = 0.3183098861838 cd/m² ÷ 10000 cd/m² per sb = 0.00003183098861838 sb
Both units are defined exactly, so the factor is exact. Apostilb definition: apostilb; Stilb definition: stilb.
Worked examples
- A reading of 31.5 asb converts to 0.001002676141 sb.
31.5 asb × 0.00003183098862 = 0.001002676141 sb - A value of 1000 asb is 0.03183098862 sb.
1000 asb × 0.00003183098862 = 0.03183098862 sb
Apostilb to Stilb conversion table
| Apostilbs (asb) | Stilbs (sb) |
|---|---|
| 1 asb | 0.00003183098862 sb |
| 4 asb | 0.0001273239545 sb |
| 10 asb | 0.0003183098862 sb |
| 31.5 asb | 0.001002676141 sb |
| 100 asb | 0.003183098862 sb |
| 318 asb | 0.01012225438 sb |
| 1000 asb | 0.03183098862 sb |
| 3180 asb | 0.1012225438 sb |
| 10000 asb | 0.3183098862 sb |
| 31800 asb | 1.012225438 sb |
Where it's used
Apostilbs are used for ophthalmic perimetry, while stilbs appear in older optics and lamp data. Both measure luminance (brightness of a surface or screen), so the conversion is a fixed factor.
Apostilb to other luminance units
| Conversion | 1 asb equals |
|---|---|
| apostilb to stilb | 0.00003183098862 sb |
| apostilb to nit | 0.3183098862 cd/m² |
| apostilb to foot-lambert | 0.09290304 fL |
| apostilb to candela per square foot | 0.02957195609 cd/ft² |
| apostilb to candela per square inch | 0.0002053608062 cd/in² |
| apostilb to lambert | 0.0001 L |
Frequently asked questions
How many stilbs are in 1 apostilb?
1 asb = 0.00003183098862 sb.
How do I convert apostilbs to stilbs?
Multiply the value in asb by 0.00003183098862, or divide it by 31415.92654. For example, 15 asb × 0.00003183098862 = 0.0004774648293 sb.
Is the asb to sb 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, "apostilb".
- 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".
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 Apostilbs to Stilbs (asb to sb). Retrieved October 25, 2026, from https://scientificconverters.com/luminance/apostilbs-to-stilbs/
IEEE
Scientific Converters, "Convert Apostilbs to Stilbs (asb to sb)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/luminance/apostilbs-to-stilbs/