Convert Apostilbs to Nits (asb to cd/m2)
1 apostilb (asb) = 0.3183098862 nits (cd/m²). 1 cd/m² = 3.141592654 asb. Example: 15 asb = 15 × 0.3183098862 = 4.774648293 cd/m².
Also searched as apostilbs to cd/m2, apostilbs in cd/m2, apostilbs into nits, asb to cd/m2, asb in nits, asb into nit, apostilb to nit, asb to nits converter and how many nits in an apostilb.
1 asb = 0.3183098862 cd/m²
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk apostilb to nit converter to paste a column from Excel.
How to Convert Apostilb to Nit
- 1 asb = 0.3183098862 cd/m²
- 1 cd/m² = 3.141592654 asb
- Example: convert 15 asb to cd/m²: 15 asb = 15 × 0.3183098862 cd/m² = 4.774648293 cd/m²
Formula
cd/m² = asb × 0.3183098861838
or cd/m² = asb ÷ 3.14159265359
Derivation from SI units:
- 1 asb = (1/π) cd/m² ≈ 0.3183 cd/m².
- 1 nit = 1 cd/m².
Both units are defined exactly, so the factor is exact. Apostilb definition: apostilb; Nit definition: nit.
Worked examples
- A reading of 31.5 asb converts to 10.02676141 cd/m².
31.5 asb × 0.3183098862 = 10.02676141 cd/m² - A value of 1000 asb is 318.3098862 cd/m².
1000 asb × 0.3183098862 = 318.3098862 cd/m²
Apostilb to Nit conversion table
| Apostilbs (asb) | Nits (cd/m²) |
|---|---|
| 1 asb | 0.3183098862 cd/m² |
| 4 asb | 1.273239545 cd/m² |
| 10 asb | 3.183098862 cd/m² |
| 31.5 asb | 10.02676141 cd/m² |
| 100 asb | 31.83098862 cd/m² |
| 318 asb | 101.2225438 cd/m² |
| 1000 asb | 318.3098862 cd/m² |
| 3180 asb | 1012.225438 cd/m² |
| 10000 asb | 3183.098862 cd/m² |
| 31800 asb | 10122.25438 cd/m² |
Where it's used
Apostilbs are used for ophthalmic perimetry, while nits appear in display brightness (phones, monitors, TVs). 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 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 stilb | 0.00003183098862 sb |
| apostilb to lambert | 0.0001 L |
Frequently asked questions
How many nits are in 1 apostilb?
1 asb = 0.3183098862 cd/m².
How do I convert apostilbs to nits?
Multiply the value in asb by 0.3183098862, or divide it by 3.141592654. For example, 15 asb × 0.3183098862 = 4.774648293 cd/m².
Is the asb to cd/m² 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".
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 4 (becquerel, gray, sievert, lux) and Table 2 (candela).
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 Nits (asb to cd/m2). Retrieved October 25, 2026, from https://scientificconverters.com/luminance/apostilbs-to-nits/
IEEE
Scientific Converters, "Convert Apostilbs to Nits (asb to cd/m2)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/luminance/apostilbs-to-nits/