Convert Apostilb to Candela per Square Meter
Live bidirectional calculator for Apostilbs (asb) and Candelas per Square Meter (cd/m²) with verified formula and conversion charts.
Luminance6 units
How the Calculation Works (Linear Scaling)
Since 1 Candela per Square Meter = 3.141593 Apostilbs, divide the value in Apostilbs by 3.141593.
Apostilb to Candela per Square Meter Conversion Table
Precomputed values for quick reference and printing.
| Apostilb | Candela per Square Meter |
|---|---|
| 1 asb | 0.3183 cd/m² |
| 2 asb | 0.6366 cd/m² |
| 3 asb | 0.9549 cd/m² |
| 4 asb | 1.2732 cd/m² |
| 5 asb | 1.5915 cd/m² |
| 6 asb | 1.9099 cd/m² |
| 7 asb | 2.2282 cd/m² |
| 8 asb | 2.5465 cd/m² |
| 9 asb | 2.8648 cd/m² |
| 10 asb | 3.1831 cd/m² |
| 15 asb | 4.7746 cd/m² |
| 20 asb | 6.3662 cd/m² |
| 25 asb | 7.9577 cd/m² |
| 30 asb | 9.5493 cd/m² |
| 40 asb | 12.7324 cd/m² |
| 50 asb | 15.9155 cd/m² |
| 75 asb | 23.8732 cd/m² |
| 100 asb | 31.831 cd/m² |
| Candela per Square Meter | Apostilb |
|---|---|
| 1 cd/m² | 3.1416 asb |
| 2 cd/m² | 6.2832 asb |
| 3 cd/m² | 9.4248 asb |
| 4 cd/m² | 12.5664 asb |
| 5 cd/m² | 15.708 asb |
| 6 cd/m² | 18.8496 asb |
| 7 cd/m² | 21.9911 asb |
| 8 cd/m² | 25.1327 asb |
| 9 cd/m² | 28.2743 asb |
| 10 cd/m² | 31.4159 asb |
| 15 cd/m² | 47.1239 asb |
| 20 cd/m² | 62.8319 asb |
| 25 cd/m² | 78.5398 asb |
| 30 cd/m² | 94.2478 asb |
| 40 cd/m² | 125.6637 asb |
| 50 cd/m² | 157.0796 asb |
| 75 cd/m² | 235.6194 asb |
| 100 cd/m² | 314.1593 asb |
About Apostilb (asb)
A non-SI metric unit of luminance representing the luminance of a perfectly diffusing surface emitting 1 lumen per square meter (1 asb = 1/π cd/m² ≈ 0.3183 cd/m²). Also known historically as the blondel.
History: Introduced in Germany to simplify photometric calculations for Lambertian diffusing surfaces in metric units.
Common Uses: Ophthalmology (visual field perimetry testing), European optical engineering archives.
About Candela per Square Meter (cd/m²)
The SI coherent derived unit of luminance, representing the luminous intensity per unit projected area of an emitting or reflecting surface.
History: Standardized by the CIE and BIPM as the definitive metric quantity for perceived surface brightness.
Common Uses: Electronic display screen brightness ratings, roadway lighting design, architectural glare calculations.
❓ Frequently Asked Questions
How many Candelas per Square Meter are in 1 Apostilb?
There are exactly 0.31831 Candelas per Square Meter in 1 Apostilb (1 asb = 0.31831 cd/m²).
What is the formula to convert Apostilb to Candela per Square Meter?
The formula is: Candela per Square Meter = Apostilb / 3.141593. Since 1 Candela per Square Meter = 3.141593 Apostilbs, divide the value in Apostilbs by 3.141593.
How do I convert 1 asb to cd/m² manually?
To convert 1 asb to cd/m²: apply the formula Candela per Square Meter = Apostilb / 3.141593. Substituting gives: 1 / 3.141593 = 0.3183 cd/m².