Apostilbs to Candelas per Square Inch (asb to cd/in2)
1 apostilb (asb) = 0.0002053608062 candelas per square inch (cd/in²). 1 cd/in² = 4869.478352 asb. Example: 15 asb = 15 × 0.0002053608062 = 0.003080412093 cd/in².
Also searched as apostilbs to cd/in2, apostilbs in cd/in2, apostilbs into candelas per square inch, asb to cd/in2, asb in candelas per square inch, asb into candela per square inch, apostilb to candela per square inch, asb to candelas per square inch converter and how many candelas per square inch in an apostilb.
1 asb = 0.0002053608062 cd/in²
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk apostilb to candela per square inch converter to paste a column from Excel.
How to Convert Apostilb to Candela per Square Inch
- 1 asb = 0.0002053608062 cd/in²
- 1 cd/in² = 4869.478352 asb
- Example: convert 15 asb to cd/in²: 15 asb = 15 × 0.0002053608062 cd/in² = 0.003080412093 cd/in²
Formula
cd/in² = asb × 0.0002053608061703
or cd/in² = asb ÷ 4869.478352021
Derivation from SI units:
- 1 asb = (1/π) cd/m² ≈ 0.3183 cd/m².
- 1 cd/in² = 1/0.00064516 cd/m² ≈ 1550 cd/m².
- 1 asb = 0.3183098861838 cd/m² ÷ 1550.003100006 cd/m² per cd/in² = 0.0002053608061703 cd/in²
Both units are defined exactly, so the factor is exact. Apostilb definition: apostilb; Candela per Square Inch definition: candela per square inch.
Worked examples
- A reading of 31.5 asb converts to 0.006468865394 cd/in².
31.5 asb × 0.0002053608062 = 0.006468865394 cd/in² - A value of 1000 asb is 0.2053608062 cd/in².
1000 asb × 0.0002053608062 = 0.2053608062 cd/in²
Apostilb to Candela per Square Inch conversion table
| Apostilbs (asb) | Candelas per Square Inch (cd/in²) |
|---|---|
| 1 asb | 0.0002053608062 cd/in² |
| 4 asb | 0.0008214432247 cd/in² |
| 10 asb | 0.002053608062 cd/in² |
| 31.5 asb | 0.006468865394 cd/in² |
| 100 asb | 0.02053608062 cd/in² |
| 318 asb | 0.06530473636 cd/in² |
| 1000 asb | 0.2053608062 cd/in² |
| 3180 asb | 0.6530473636 cd/in² |
| 10000 asb | 2.053608062 cd/in² |
| 31800 asb | 6.530473636 cd/in² |
Where it's used
Apostilbs are used for ophthalmic perimetry, while candelas per square inch appear in lamp and LED specifications. 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 inch | 0.0002053608062 cd/in² |
| 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 stilb | 0.00003183098862 sb |
| apostilb to lambert | 0.0001 L |
Frequently asked questions
How many candelas per square inch are in 1 apostilb?
1 asb = 0.0002053608062 cd/in².
How do I convert apostilbs to candelas per square inch?
Multiply the value in asb by 0.0002053608062, or divide it by 4869.478352. For example, 15 asb × 0.0002053608062 = 0.003080412093 cd/in².
Is the asb to cd/in² 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 inch".
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 Inch (asb to cd/in2). Retrieved October 25, 2026, from https://scientificconverters.com/luminance/apostilbs-to-candelas-per-square-inch/
IEEE
Scientific Converters, "Apostilbs to Candelas per Square Inch (asb to cd/in2)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/luminance/apostilbs-to-candelas-per-square-inch/