Convert Nits to Apostilbs (cd/m2 to asb)
1 nit (cd/m²) = 3.141592654 apostilbs (asb). 1 asb = 0.3183098862 cd/m². Example: 15 cd/m² = 15 × 3.141592654 = 47.1238898 asb.
Also searched as nits to asb, nits in asb, nits into apostilbs, cd/m2 to asb, cd/m2 in apostilbs, cd/m2 into apostilb, nit to apostilb, cd/m2 to apostilbs converter and how many apostilbs in a nit.
1 cd/m² = 3.141592654 asb
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk nit to apostilb converter to paste a column from Excel.
How to Convert Nit to Apostilb
- 1 cd/m² = 3.141592654 asb
- 1 asb = 0.3183098862 cd/m²
- Example: convert 15 cd/m² to asb: 15 cd/m² = 15 × 3.141592654 asb = 47.1238898 asb
Formula
asb = cd/m² × 3.14159265359
Derivation from SI units:
- 1 nit = 1 cd/m².
- 1 asb = (1/π) cd/m² ≈ 0.3183 cd/m².
Both units are defined exactly, so the factor is exact. Nit definition: nit; Apostilb definition: apostilb.
Worked examples
- A reading of 500 cd/m² converts to 1570.796327 asb.
500 cd/m² × 3.141592654 = 1570.796327 asb - A value of 1600 cd/m² is 5026.548246 asb.
1600 cd/m² × 3.141592654 = 5026.548246 asb
Nit to Apostilb conversion table
| Nits (cd/m²) | Apostilbs (asb) |
|---|---|
| 100 cd/m² | 314.1592654 asb |
| 250 cd/m² | 785.3981634 asb |
| 300 cd/m² | 942.4777961 asb |
| 500 cd/m² | 1570.796327 asb |
| 600 cd/m² | 1884.955592 asb |
| 1000 cd/m² | 3141.592654 asb |
| 1600 cd/m² | 5026.548246 asb |
| 2000 cd/m² | 6283.185307 asb |
| 4000 cd/m² | 12566.37061 asb |
| 10000 cd/m² | 31415.92654 asb |
Where it's used
Nits are used for display brightness (phones, monitors, TVs), while apostilbs appear in ophthalmic perimetry. Both measure luminance (brightness of a surface or screen), so the conversion is a fixed factor.
Nit to other luminance units
| Conversion | 1 cd/m² equals |
|---|---|
| nit to apostilb | 3.141592654 asb |
| nit to foot-lambert | 0.291863508 fL |
| nit to candela per square foot | 0.09290304 cd/ft² |
| nit to candela per square inch | 0.00064516 cd/in² |
| nit to stilb | 0.0001 sb |
| nit to lambert | 0.0003141592654 L |
Frequently asked questions
How many apostilbs are in 1 nit?
1 cd/m² = 3.141592654 asb.
How do I convert nits to apostilbs?
Multiply the value in cd/m² by 3.141592654. For example, 15 cd/m² × 3.141592654 = 47.1238898 asb.
Is the cd/m² to asb 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
- 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).
- 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".
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 Nits to Apostilbs (cd/m2 to asb). Retrieved October 25, 2026, from https://scientificconverters.com/luminance/nits-to-apostilbs/
IEEE
Scientific Converters, "Convert Nits to Apostilbs (cd/m2 to asb)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/luminance/nits-to-apostilbs/