Luminance / cd/m² → asb
Convert Candelas per square meter to Apostilbs
Convert visible-light luminance in candela per projected area. Convert Candelas per square meter (cd/m²) to Apostilbs (asb). Find the formula, worked examples, unit definitions, and practical guidance below.
Reverse: Apostilbs to Candelas per square meter →
How to convert candelas per square meter to apostilbs
Luminance describes directional brightness weighted for human vision. It differs from illuminance on a surface and cannot be converted to lux without geometry.
Use x for the value in cd/m², b for the intermediate value in cd/m², and y for the result in asb.
asb = cd/m² ÷ 0.3183098861837907
Worked examples
10 cd/m² ≈ 31.4159265359 asb
Step 1: (10 × 1) ≈ 10 cd/m².
Step 2: 10 ÷ 0.318309886184 ≈ 31.4159265359 asb.20 cd/m² ≈ 62.8318530718 asb
Step 1: (20 × 1) ≈ 20 cd/m².
Step 2: 20 ÷ 0.318309886184 ≈ 62.8318530718 asb.
Results are rounded to 12 significant digits. Converting units does not increase the precision of the original measurement. Very large or small values outside JavaScript’s finite numeric range are rejected.
About Candelas per square meter
Candelas per square meter (cd/m²) measures luminance under the conventions above. The base value in cd/m² is (x × 1), where x is the numerical value in cd/m². Factors shown here are rounded for display; calculations use the stored factor.
About Apostilbs
Apostilbs (asb) measures luminance under the conventions above. The base value in cd/m² is (x × 0.318309886184), where x is the numerical value in asb. Factors shown here are rounded for display; calculations use the stored factor.
Definitions and sources
Carry the same physical assumptions into subsequent physics calculations.
Candelas per square meter to apostilbs reference table
| Candelas per square meter (cd/m²) | Apostilbs (asb) |
|---|---|
| 1 | 3.14159265359 |
| 5 | 15.7079632679 |
| 10 | 31.4159265359 |
| 25 | 78.5398163397 |
| 50 | 157.079632679 |
| 100 | 314.159265359 |
| 1000 | 3141.59265359 |
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