Convert Candela per Square Foot to Apostilb
Convert candelas per square foot to apostilbs by entering a value below.
How to Convert Candelas per Square Foot to Apostilbs
The candela per square foot and apostilb are both units of luminance. 1 candela per square foot equals 33.815821888 apostilbs. This means to convert candelas per square foot to apostilbs, you multiply by 33.815821888.
Formula
Step-by-Step Example
Convert 5 cd/ft² to apostilbs:
We need to convert candelas per square foot to apostilbs
Since 1 cd/ft² = 33.815821888 asb, multiply by 33.815821888
5 × 33.815821888 = 169.07910944
5 cd/ft² = 169.07910944 asb
Candela per Square Foot to Apostilb Conversion Table
Quick reference table for common candela per square foot to apostilb conversions. Click any value for detailed calculation.
| Candelas per Square Foot (cd/ft²) | Apostilbs (asb) |
|---|---|
| 1 cd/ft² | 33.815821888 asb |
| 2 cd/ft² | 67.631643776 asb |
| 5 cd/ft² | 169.07910944 asb |
| 10 cd/ft² | 338.15821888 asb |
| 15 cd/ft² | 507.23732832 asb |
| 20 cd/ft² | 676.31643776 asb |
| 25 cd/ft² | 845.39554721 asb |
| 50 cd/ft² | 1690.7910944 asb |
| 100 cd/ft² | 3381.5821888 asb |
About These Units
Candela per Square Foot (cd/ft²)
Candelas per square foot (cd/ft²) is the imperial luminance unit equal to 10.76 nits. Used occasionally in US architectural lighting. One cd/ft² ≈ 3.14 foot-lamberts. Not commonly used; foot-lamberts preferred in US practice.
Apostilb (asb)
The apostilb (asb) equals 1/π cd/m² ≈ 0.318 nits. Represents the luminance of a perfect diffuser illuminated by 1 lux. Also called blondel. One apostilb ≈ 0.0929 foot-lamberts. Useful in theoretical calculations involving diffuse reflection.
Frequently Asked Questions
How do I convert candelas per square foot to apostilbs?
To convert candelas per square foot to apostilbs, multiply the value by 33.815821888. For example, 10 cd/ft² = 338.15821888 asb.
How many apostilbs are in 1 candela per square foot?
1 candela per square foot equals 33.815821888 apostilbs.
What is the formula for candelas per square foot to apostilbs?
The formula is: asb = cd/ft² × 33.815821888.