Candelas per Square Inch to Apostilbs (cd/in2 to asb)
1 candela per square inch (cd/in²) = 4869.478352 apostilbs (asb). 1 asb = 0.0002053608062 cd/in². Example: 15 cd/in² = 15 × 4869.478352 = 73042.17528 asb.
Also searched as candelas per square inch to asb, candelas per square inch in asb, candelas per square inch into apostilbs, cd/in2 to asb, cd/in2 in apostilbs, cd/in2 into apostilb, candela per square inch to apostilb, cd/in2 to apostilbs converter and how many apostilbs in a candela per square inch.
1 cd/in² = 4869.478352 asb
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk candela per square inch to apostilb converter to paste a column from Excel.
How to Convert Candela per Square Inch to Apostilb
- 1 cd/in² = 4869.478352 asb
- 1 asb = 0.0002053608062 cd/in²
- Example: convert 15 cd/in² to asb: 15 cd/in² = 15 × 4869.478352 asb = 73042.17528 asb
Formula
asb = cd/in² × 4869.478352021
Derivation from SI units:
- 1 cd/in² = 1/0.00064516 cd/m² ≈ 1550 cd/m².
- 1 asb = (1/π) cd/m² ≈ 0.3183 cd/m².
- 1 cd/in² = 1550.003100006 cd/m² ÷ 0.3183098861838 cd/m² per asb = 4869.478352021 asb
Both units are defined exactly, so the factor is exact. Candela per Square Inch definition: candela per square inch; Apostilb definition: apostilb.
Worked examples
- A reading of 2 cd/in² converts to 9738.956704 asb.
2 cd/in² × 4869.478352 = 9738.956704 asb - A value of 20 cd/in² is 97389.56704 asb.
20 cd/in² × 4869.478352 = 97389.56704 asb
Candela per Square Inch to Apostilb conversion table
| Candelas per Square Inch (cd/in²) | Apostilbs (asb) |
|---|---|
| 0.1 cd/in² | 486.9478352 asb |
| 0.5 cd/in² | 2434.739176 asb |
| 1 cd/in² | 4869.478352 asb |
| 2 cd/in² | 9738.956704 asb |
| 5 cd/in² | 24347.39176 asb |
| 10 cd/in² | 48694.78352 asb |
| 20 cd/in² | 97389.56704 asb |
| 50 cd/in² | 243473.9176 asb |
| 100 cd/in² | 486947.8352 asb |
| 1000 cd/in² | 4869478.352 asb |
Where it's used
Candelas per Square Inch are used for lamp and LED specifications, 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 Inch to other luminance units
| Conversion | 1 cd/in² equals |
|---|---|
| candela per square inch to apostilb | 4869.478352 asb |
| candela per square inch to nit | 1550.0031 cd/m² |
| candela per square inch to foot-lambert | 452.3893421 fL |
| candela per square inch to candela per square foot | 144 cd/ft² |
| candela per square inch to stilb | 0.15500031 sb |
| candela per square inch to lambert | 0.4869478352 L |
Frequently asked questions
How many apostilbs are in 1 candela per square inch?
1 cd/in² = 4869.478352 asb.
How do I convert candelas per square inch to apostilbs?
Multiply the value in cd/in² by 4869.478352. For example, 15 cd/in² × 4869.478352 = 73042.17528 asb.
Is the cd/in² 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 inch".
- 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 Inch to Apostilbs (cd/in2 to asb). Retrieved October 25, 2026, from https://scientificconverters.com/luminance/candelas-per-square-inch-to-apostilbs/
IEEE
Scientific Converters, "Candelas per Square Inch to Apostilbs (cd/in2 to asb)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/luminance/candelas-per-square-inch-to-apostilbs/