Candelas per Square Foot to Foot-lamberts Converter
Enter the luminance in candelas per square foot below to convert it to foot-lamberts.
Convert Candelas per Square Foot to Foot-lamberts
Enter a value in candelas per square foot (cd/ft²) to convert to foot-lamberts (fL).
Candela per Square Foot to Foot-lambert Conversion Table
Table showing various candela per square foot measurements converted to foot-lamberts. Click any preset value or arrow to load it into the converter.
| Candelas per Square Foot (cd/ft²) | Foot-lamberts (fL) |
|---|---|
| 1 cd/ft² | 3.1415926 fL |
| 2 cd/ft² | 6.2831853 fL |
| 2.5 cd/ft² | 7.8539816 fL |
| 5 cd/ft² | 15.7079632 fL |
| 10 cd/ft² | 31.4159265 fL |
| 15 cd/ft² | 47.1238897 fL |
| 20 cd/ft² | 62.831853 fL |
| 25 cd/ft² | 78.5398162 fL |
| 30 cd/ft² | 94.2477795 fL |
| 50 cd/ft² | 157.0796324 fL |
How to Convert Candelas per Square Foot to Foot-lamberts
To convert candelas per square foot to foot-lamberts, multiply the luminance by the following conversion ratio: 3.1415926 foot-lamberts/candela per square foot.
Since one candela per square foot is equal to 3.1415926 foot-lamberts, you can use this simple formula to convert:
The luminance in foot-lamberts is equal to the luminance in candelas per square foot multiplied by 3.1415926.
For example, here's how to convert 5 candelas per square foot to foot-lamberts using the formula above.
How Many Foot-lamberts Are in a Candela per Square Foot?
There are 3.1415926 foot-lamberts in a candela per square foot, which is why we use this value in the formula above.
Our candela per square foot to foot-lambert calculator automatically converts your luminance measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Candelas per Square Foot and foot-lamberts are both units used to measure luminance. Keep reading to learn more about each unit.
What Is a Candela per Square Foot?
A candela per square foot is a unit of luminance equal to 10.7639104 candelas per sq. meter (cd/m²), the base unit for luminance. Equal to 10.7639 cd/m². [1]
The candela per square foot is classified as a US customary unit of luminance. Candelas per Square Foot can be abbreviated as cd/ft²; for example, 1 candela per square foot can be written as 1 cd/ft².
When working with candelas per square foot (cd/ft²) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, candelas per square foot (cd/ft²) are widely used across standard luminance applications within US customary workflows, engineering documentation, and technical data sheets.
What Is a Foot-lambert?
A foot-lambert is a unit of luminance equal to 3.4262591 candelas per sq. meter (cd/m²), the base unit for luminance. Cinema projection luminance unit (1/π cd/ft² ≈ 3.426 cd/m²). [2]
The foot-lambert is classified as a US customary unit of luminance. Foot-lamberts can be abbreviated as fL; for example, 1 foot-lambert can be written as 1 fL.
When working with foot-lamberts (fL) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, foot-lamberts (fL) are widely used across standard luminance applications within US customary workflows, engineering documentation, and technical data sheets.
When converting luminance between candelas per square foot (cd/ft²) and foot-lamberts (fL), keep full floating-point precision (1 cd/ft² = 3.1415926 fL; 1 fL = 0.3183099 cd/ft²) during intermediate calculations and round only the final foot-lambert figure to match your instrument tolerance.
More Candela per Square Foot & Foot-lambert Conversions
Need to calculate in the opposite direction? Use our foot-lamberts to candelas per square foot calculator to switch your starting unit immediately. You can also explore related tools such as converting foot-lamberts to candelas per square foot, converting candelas per sq. meter (nits) to kilocandelas per square meter, or converting kilocandelas per square meter to candelas per sq. meter (nits).
Convert from Candelas per Square Foot
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Length)·Luminance Metrology Standard — Candelas per Square Foot (cd/ft²) to Foot-lamberts (fL)
- [2]BIPM SpecificationBIPM (SI Base Unit: Metre (m))·Unit Specifications: Candela per Square Foot (cd/ft²) & Foot-lambert (fL)
- [3]NIST HB 133 ReferenceNIST HB 133 (NIST Handbook 133 (2019 Ed.))·Conversion Factors & Mathematical Basis (cd/ft² to fL)