Candelas per Square Foot to Apostilbs (cd/ft2 to asb)
1 candela per square foot (cd/ft²) = 33.81582189 apostilbs (asb). 1 asb = 0.02957195609 cd/ft². Example: 15 cd/ft² = 15 × 33.81582189 = 507.2373283 asb.
Also searched as candelas per square foot to asb, candelas per square foot in asb, candelas per square foot into apostilbs, cd/ft2 to asb, cd/ft2 in apostilbs, cd/ft2 into apostilb, candela per square foot to apostilb, cd/ft2 to apostilbs converter and how many apostilbs in a candela per square foot.
1 cd/ft² = 33.81582189 asb
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk candela per square foot to apostilb converter to paste a column from Excel.
How to Convert Candela per Square Foot to Apostilb
- 1 cd/ft² = 33.81582189 asb
- 1 asb = 0.02957195609 cd/ft²
- Example: convert 15 cd/ft² to asb: 15 cd/ft² = 15 × 33.81582189 asb = 507.2373283 asb
Formula
asb = cd/ft² × 33.81582188903
Derivation from SI units:
- 1 cd/ft² = 1/0.09290304 cd/m² ≈ 10.764 cd/m².
- 1 asb = (1/π) cd/m² ≈ 0.3183 cd/m².
- 1 cd/ft² = 10.76391041671 cd/m² ÷ 0.3183098861838 cd/m² per asb = 33.81582188903 asb
Both units are defined exactly, so the factor is exact. Candela per Square Foot definition: candela per square foot; Apostilb definition: apostilb.
Worked examples
- A reading of 2 cd/ft² converts to 67.63164378 asb.
2 cd/ft² × 33.81582189 = 67.63164378 asb - A value of 20 cd/ft² is 676.3164378 asb.
20 cd/ft² × 33.81582189 = 676.3164378 asb
Candela per Square Foot to Apostilb conversion table
| Candelas per Square Foot (cd/ft²) | Apostilbs (asb) |
|---|---|
| 0.1 cd/ft² | 3.381582189 asb |
| 0.5 cd/ft² | 16.90791094 asb |
| 1 cd/ft² | 33.81582189 asb |
| 2 cd/ft² | 67.63164378 asb |
| 5 cd/ft² | 169.0791094 asb |
| 10 cd/ft² | 338.1582189 asb |
| 20 cd/ft² | 676.3164378 asb |
| 50 cd/ft² | 1690.791094 asb |
| 100 cd/ft² | 3381.582189 asb |
| 1000 cd/ft² | 33815.82189 asb |
Where it's used
Candelas per Square Foot are used for US lighting engineering, while apostilbs appear in ophthalmic perimetry. Both measure luminance (brightness of a surface or screen), so the conversion is a fixed factor.
Candela per Square Foot to other luminance units
| Conversion | 1 cd/ft² equals |
|---|---|
| candela per square foot to apostilb | 33.81582189 asb |
| candela per square foot to nit | 10.76391042 cd/m² |
| candela per square foot to foot-lambert | 3.141592654 fL |
| candela per square foot to candela per square inch | 0.006944444444 cd/in² |
| candela per square foot to stilb | 0.001076391042 sb |
| candela per square foot to lambert | 0.003381582189 L |
Frequently asked questions
How many apostilbs are in 1 candela per square foot?
1 cd/ft² = 33.81582189 asb.
How do I convert candelas per square foot to apostilbs?
Multiply the value in cd/ft² by 33.81582189. For example, 15 cd/ft² × 33.81582189 = 507.2373283 asb.
Is the cd/ft² 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
- 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 foot".
- 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). Candelas per Square Foot to Apostilbs (cd/ft2 to asb). Retrieved October 25, 2026, from https://scientificconverters.com/luminance/candelas-per-square-foot-to-apostilbs/
IEEE
Scientific Converters, "Candelas per Square Foot to Apostilbs (cd/ft2 to asb)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/luminance/candelas-per-square-foot-to-apostilbs/