Candelas per Square Foot to Foot-lamberts (cd/ft2 to fL)
1 candela per square foot (cd/ft²) = 3.141592654 foot-lamberts (fL). 1 fL = 0.3183098862 cd/ft². Example: 15 cd/ft² = 15 × 3.141592654 = 47.1238898 fL.
Also searched as candelas per square foot to fL, candelas per square foot in fL, candelas per square foot into foot-lamberts, cd/ft2 to fL, cd/ft2 in foot-lamberts, cd/ft2 into foot-lambert, candela per square foot to foot-lambert, cd/ft2 to foot-lamberts converter and how many foot-lamberts in a candela per square foot.
1 cd/ft² = 3.141592654 fL
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk candela per square foot to foot-lambert converter to paste a column from Excel.
How to Convert Candela per Square Foot to Foot-lambert
- 1 cd/ft² = 3.141592654 fL
- 1 fL = 0.3183098862 cd/ft²
- Example: convert 15 cd/ft² to fL: 15 cd/ft² = 15 × 3.141592654 fL = 47.1238898 fL
Formula
fL = cd/ft² × 3.14159265359
Derivation from SI units:
- 1 cd/ft² = 1/0.09290304 cd/m² ≈ 10.764 cd/m².
- 1 fL = (1/π) cd/ft² ≈ 3.426 cd/m².
- 1 cd/ft² = 10.76391041671 cd/m² ÷ 3.426259099635 cd/m² per fL = 3.14159265359 fL
Both units are defined exactly, so the factor is exact. Candela per Square Foot definition: candela per square foot; Foot-lambert definition: foot-lambert.
Worked examples
- A reading of 2 cd/ft² converts to 6.283185307 fL.
2 cd/ft² × 3.141592654 = 6.283185307 fL - A value of 20 cd/ft² is 62.83185307 fL.
20 cd/ft² × 3.141592654 = 62.83185307 fL
Candela per Square Foot to Foot-lambert conversion table
| Candelas per Square Foot (cd/ft²) | Foot-lamberts (fL) |
|---|---|
| 0.1 cd/ft² | 0.3141592654 fL |
| 0.5 cd/ft² | 1.570796327 fL |
| 1 cd/ft² | 3.141592654 fL |
| 2 cd/ft² | 6.283185307 fL |
| 5 cd/ft² | 15.70796327 fL |
| 10 cd/ft² | 31.41592654 fL |
| 20 cd/ft² | 62.83185307 fL |
| 50 cd/ft² | 157.0796327 fL |
| 100 cd/ft² | 314.1592654 fL |
| 1000 cd/ft² | 3141.592654 fL |
Where it's used
Candelas per Square Foot are used for US lighting engineering, while foot-lamberts appear in cinema projection standards (DCI 14 fL). Both measure luminance (brightness of a surface or screen), so the conversion is a fixed factor.
Candela per Square Foot to other luminance units
| Conversion | 1 cd/ft² equals |
|---|---|
| candela per square foot to foot-lambert | 3.141592654 fL |
| candela per square foot to nit | 10.76391042 cd/m² |
| candela per square foot to apostilb | 33.81582189 asb |
| candela per square foot to candela per square inch | 0.006944444444 cd/in² |
| candela per square foot to stilb | 0.001076391042 sb |
| candela per square foot to lambert | 0.003381582189 L |
Frequently asked questions
How many foot-lamberts are in 1 candela per square foot?
1 cd/ft² = 3.141592654 fL.
How do I convert candelas per square foot to foot-lamberts?
Multiply the value in cd/ft² by 3.141592654. For example, 15 cd/ft² × 3.141592654 = 47.1238898 fL.
Is the cd/ft² to fL conversion exact?
Yes. Both units are defined exactly, so the ratio is exact; its decimal form does not terminate and is shown here to 10 significant figures (more with the precision selector).
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "candela per square foot".
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "footlambert".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Candelas per Square Foot to Foot-lamberts (cd/ft2 to fL). Retrieved October 25, 2026, from https://scientificconverters.com/luminance/candelas-per-square-foot-to-foot-lamberts/
IEEE
Scientific Converters, "Candelas per Square Foot to Foot-lamberts (cd/ft2 to fL)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/luminance/candelas-per-square-foot-to-foot-lamberts/