Photometry
asbtocd/m²
Convert apostilbs (asb) to candelas per square metre (cd/m²).
Factor1 asb = 0.3183099 cd/m²
Converter
asb
Accepts numbers or expressions, e.g. 150 + 14.7
Result
cd/m²
Rendered to 6 significant figures.
Formula
Formula
cd/m² = asb × 0.3183099
Multiply any value in apostilbs by 0.3183099 to obtain the value in candelas per square metre.
Worked example
Convert 100 asb to cd/m².
- 01Start with 100 asb.
- 02Multiply by the conversion factor: 100 × 0.3183099 = 31.831 cd/m².
Result100 asb = 31.831 cd/m²
Conversion table
| asb | cd/m² |
|---|---|
| 1 | 0.31831 |
| 2 | 0.63662 |
| 5 | 1.5915 |
| 10 | 3.1831 |
| 20 | 6.3662 |
| 50 | 15.915 |
| 100 | 31.831 |
| 200 | 63.662 |
| 500 | 159.15 |
| 1000 | 318.31 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from asb to cd/m²?
1 asb equals 0.3183099 cd/m². To convert, multiply the value in apostilbs by 0.3183099.
How do I convert 1 asb to cd/m²?
1 asb = 0.31831 cd/m². For any value, multiply by 0.3183099.
How do I convert cd/m² back to asb?
Divide by the same factor — or equivalently, multiply by 3.141593. So 1 cd/m² = 3.14159 asb.
When would I need to convert apostilb to candela per square metre?
Luminance conversions between asb and cd/m² are used in display engineering, road and traffic-signal design, and photometric measurement of luminous surfaces. cd/m² (nit) is the SI standard; foot-lambert and stilb appear in legacy datasheets and specialist optics work.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).