Apostilbs to Candelas per Square Foot (asb to cd/ft2)
1 apostilb (asb) = 0.02957195609 candelas per square foot (cd/ft²). 1 cd/ft² = 33.81582189 asb. Example: 15 asb = 15 × 0.02957195609 = 0.4435793413 cd/ft².
Also searched as apostilbs to cd/ft2, apostilbs in cd/ft2, apostilbs into candelas per square foot, asb to cd/ft2, asb in candelas per square foot, asb into candela per square foot, apostilb to candela per square foot, asb to candelas per square foot converter and how many candelas per square foot in an apostilb.
1 asb = 0.02957195609 cd/ft²
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk apostilb to candela per square foot converter to paste a column from Excel.
How to Convert Apostilb to Candela per Square Foot
- 1 asb = 0.02957195609 cd/ft²
- 1 cd/ft² = 33.81582189 asb
- Example: convert 15 asb to cd/ft²: 15 asb = 15 × 0.02957195609 cd/ft² = 0.4435793413 cd/ft²
Formula
cd/ft² = asb × 0.02957195608853
or cd/ft² = asb ÷ 33.81582188903
Derivation from SI units:
- 1 asb = (1/π) cd/m² ≈ 0.3183 cd/m².
- 1 cd/ft² = 1/0.09290304 cd/m² ≈ 10.764 cd/m².
- 1 asb = 0.3183098861838 cd/m² ÷ 10.76391041671 cd/m² per cd/ft² = 0.02957195608853 cd/ft²
Both units are defined exactly, so the factor is exact. Apostilb definition: apostilb; Candela per Square Foot definition: candela per square foot.
Worked examples
- A reading of 31.5 asb converts to 0.9315166168 cd/ft².
31.5 asb × 0.02957195609 = 0.9315166168 cd/ft² - A value of 1000 asb is 29.57195609 cd/ft².
1000 asb × 0.02957195609 = 29.57195609 cd/ft²
Apostilb to Candela per Square Foot conversion table
| Apostilbs (asb) | Candelas per Square Foot (cd/ft²) |
|---|---|
| 1 asb | 0.02957195609 cd/ft² |
| 4 asb | 0.1182878244 cd/ft² |
| 10 asb | 0.2957195609 cd/ft² |
| 31.5 asb | 0.9315166168 cd/ft² |
| 100 asb | 2.957195609 cd/ft² |
| 318 asb | 9.403882036 cd/ft² |
| 1000 asb | 29.57195609 cd/ft² |
| 3180 asb | 94.03882036 cd/ft² |
| 10000 asb | 295.7195609 cd/ft² |
| 31800 asb | 940.3882036 cd/ft² |
Where it's used
Apostilbs are used for ophthalmic perimetry, while candelas per square foot appear in US lighting engineering. 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 candela per square foot | 0.02957195609 cd/ft² |
| apostilb to nit | 0.3183098862 cd/m² |
| apostilb to foot-lambert | 0.09290304 fL |
| 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 candelas per square foot are in 1 apostilb?
1 asb = 0.02957195609 cd/ft².
How do I convert apostilbs to candelas per square foot?
Multiply the value in asb by 0.02957195609, or divide it by 33.81582189. For example, 15 asb × 0.02957195609 = 0.4435793413 cd/ft².
Is the asb to cd/ft² 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, "candela per square foot".
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). Apostilbs to Candelas per Square Foot (asb to cd/ft2). Retrieved October 25, 2026, from https://scientificconverters.com/luminance/apostilbs-to-candelas-per-square-foot/
IEEE
Scientific Converters, "Apostilbs to Candelas per Square Foot (asb to cd/ft2)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/luminance/apostilbs-to-candelas-per-square-foot/