Foot-lamberts to Candelas per Square Foot (fL to cd/ft2)
1 foot-lambert (fL) = 0.3183098862 candelas per square foot (cd/ft²). 1 cd/ft² = 3.141592654 fL. Example: 15 fL = 15 × 0.3183098862 = 4.774648293 cd/ft².
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1 fL = 0.3183098862 cd/ft²
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk foot-lambert to candela per square foot converter to paste a column from Excel.
How to Convert Foot-lambert to Candela per Square Foot
- 1 fL = 0.3183098862 cd/ft²
- 1 cd/ft² = 3.141592654 fL
- Example: convert 15 fL to cd/ft²: 15 fL = 15 × 0.3183098862 cd/ft² = 4.774648293 cd/ft²
Formula
cd/ft² = fL × 0.3183098861838
or cd/ft² = fL ÷ 3.14159265359
Derivation from SI units:
- 1 fL = (1/π) cd/ft² ≈ 3.426 cd/m².
- 1 cd/ft² = 1/0.09290304 cd/m² ≈ 10.764 cd/m².
- 1 fL = 3.426259099635 cd/m² ÷ 10.76391041671 cd/m² per cd/ft² = 0.3183098861838 cd/ft²
Both units are defined exactly, so the factor is exact. Foot-lambert definition: foot-lambert; Candela per Square Foot definition: candela per square foot.
Worked examples
- A reading of 10 fL converts to 3.183098862 cd/ft².
10 fL × 0.3183098862 = 3.183098862 cd/ft² - A value of 22 fL is 7.002817496 cd/ft².
22 fL × 0.3183098862 = 7.002817496 cd/ft²
Foot-lambert to Candela per Square Foot conversion table
| Foot-lamberts (fL) | Candelas per Square Foot (cd/ft²) |
|---|---|
| 1 fL | 0.3183098862 cd/ft² |
| 4 fL | 1.273239545 cd/ft² |
| 7 fL | 2.228169203 cd/ft² |
| 10 fL | 3.183098862 cd/ft² |
| 14 fL | 4.456338407 cd/ft² |
| 16 fL | 5.092958179 cd/ft² |
| 22 fL | 7.002817496 cd/ft² |
| 30 fL | 9.549296586 cd/ft² |
| 50 fL | 15.91549431 cd/ft² |
| 100 fL | 31.83098862 cd/ft² |
Where it's used
Foot-lamberts are used for cinema projection standards (DCI 14 fL), while candelas per square foot appear in US lighting engineering. Both measure luminance (brightness of a surface or screen), so the conversion is a fixed factor.
Foot-lambert to other luminance units
| Conversion | 1 fL equals |
|---|---|
| foot-lambert to candela per square foot | 0.3183098862 cd/ft² |
| foot-lambert to nit | 3.4262591 cd/m² |
| foot-lambert to apostilb | 10.76391042 asb |
| foot-lambert to candela per square inch | 0.002210485321 cd/in² |
| foot-lambert to stilb | 0.00034262591 sb |
| foot-lambert to lambert | 0.001076391042 L |
Frequently asked questions
How many candelas per square foot are in 1 foot-lambert?
1 fL = 0.3183098862 cd/ft².
How do I convert foot-lamberts to candelas per square foot?
Multiply the value in fL by 0.3183098862, or divide it by 3.141592654. For example, 15 fL × 0.3183098862 = 4.774648293 cd/ft².
Is the fL to cd/ft² 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, "footlambert".
- 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".
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). Foot-lamberts to Candelas per Square Foot (fL to cd/ft2). Retrieved October 25, 2026, from https://scientificconverters.com/luminance/foot-lamberts-to-candelas-per-square-foot/
IEEE
Scientific Converters, "Foot-lamberts to Candelas per Square Foot (fL to cd/ft2)," scientificconverters.com. Accessed: Oct. 25, 2026. [Online]. Available: https://scientificconverters.com/luminance/foot-lamberts-to-candelas-per-square-foot/