How to convert candelas per square foot to foot-lamberts
fL = cd/ft² × 3.141592654Multiply the value in candelas per square foot by 3.141592654. To go the other way, multiply by 0.3183098862 (or divide by 3.141592654).
A candela per square foot is larger than a foot-lambert: one candela per square foot contains 3.141592654 foot-lamberts.
Worked examples
- 1 candela per square foot1 cd/ft² × 3.141592654 = 3.141592654 fL
- 5 candelas per square foot5 cd/ft² × 3.141592654 = 15.70796327 fL
- 10 candelas per square foot10 cd/ft² × 3.141592654 = 31.41592654 fL
- 20 candelas per square foot20 cd/ft² × 3.141592654 = 62.83185307 fL
- 100 candelas per square foot100 cd/ft² × 3.141592654 = 314.1592654 fL
Candelas per square foot to foot-lamberts conversion table
Values are calculated by the conversion engine and rounded to 8 significant figures.
| Candelas per square foot (cd/ft²) | Foot-lamberts (fL) |
|---|---|
| 0.1 cd/ft² | 0.31415927 fL |
| 0.25 cd/ft² | 0.78539816 fL |
| 0.5 cd/ft² | 1.5707963 fL |
| 1 cd/ft² | 3.1415927 fL |
| 2 cd/ft² | 6.2831853 fL |
| 3 cd/ft² | 9.424778 fL |
| 4 cd/ft² | 12.566371 fL |
| 5 cd/ft² | 15.707963 fL |
| 6 cd/ft² | 18.849556 fL |
| 7 cd/ft² | 21.991149 fL |
| 8 cd/ft² | 25.132741 fL |
| 9 cd/ft² | 28.274334 fL |
| 10 cd/ft² | 31.415927 fL |
| Candelas per square foot (cd/ft²) | Foot-lamberts (fL) |
|---|---|
| 12 cd/ft² | 37.699112 fL |
| 15 cd/ft² | 47.12389 fL |
| 20 cd/ft² | 62.831853 fL |
| 25 cd/ft² | 78.539816 fL |
| 30 cd/ft² | 94.24778 fL |
| 40 cd/ft² | 125.66371 fL |
| 50 cd/ft² | 157.07963 fL |
| 75 cd/ft² | 235.61945 fL |
| 100 cd/ft² | 314.15927 fL |
| 250 cd/ft² | 785.39816 fL |
| 500 cd/ft² | 1,570.7963 fL |
| 1,000 cd/ft² | 3,141.5927 fL |
About the units
Candela per square foot (cd/ft²)
The candela per square foot (cd/ft²) is a unit of luminance in the US customary system. One candela per square foot equals 10.76391042 nits (cd/m²).
Foot-lambert (fL)
(1/π) cd/ft², about 3.426 cd/m². Cinema screens are specified around 14–16 fL. One foot-lambert equals 3.4262591 nits (cd/m²).
Frequently asked questions
How many foot-lamberts are in one candela per square foot?
There are 3.141592654 foot-lamberts in one candela per square foot, and this value is exact by definition.
How do I convert candelas per square foot to foot-lamberts?
Multiply the number of candelas per square foot by 3.141592654. For example, 10 cd/ft² × 3.141592654 = 31.41592654 fL.
How many candelas per square foot are in one foot-lambert?
One foot-lambert equals 0.3183098862 candelas per square foot. That is the reverse factor, 1 ÷ 3.141592654.
What is 10 candelas per square foot in foot-lamberts?
10 cd/ft² = 31.41592654 fL.
Is this cd/ft² to fL converter accurate?
Yes. Both units are defined exactly in terms of SI units, so the conversion factor is exact; results are shown to 12 significant figures by default and you can change precision in the converter. Calculations run in your browser using the same tested engine that generated this page.