Stilbs to Foot-lamberts Converter
Enter the luminance in stilbs below to convert it to foot-lamberts.
Convert Stilbs to Foot-lamberts
Enter a value in stilbs (sb) to convert to foot-lamberts (fL).
Stilb to Foot-lambert Conversion Table
Table showing various stilb measurements converted to foot-lamberts. Click any preset value or arrow to load it into the converter.
| Stilbs (sb) | Foot-lamberts (fL) |
|---|---|
| 1 sb | 2,918.6350793 fL |
| 2 sb | 5,837.2701586 fL |
| 2.5 sb | 7,296.5876982 fL |
| 5 sb | 14,593.1753965 fL |
| 10 sb | 29,186.3507929 fL |
| 15 sb | 43,779.5261894 fL |
| 20 sb | 58,372.7015858 fL |
| 25 sb | 72,965.8769823 fL |
| 30 sb | 87,559.0523787 fL |
| 50 sb | 145,931.7539645 fL |
How to Convert Stilbs to Foot-lamberts
To convert stilbs to foot-lamberts, multiply the luminance by the following conversion ratio: 2,918.6350793 foot-lamberts/stilb.
Since one stilb is equal to 2,918.6350793 foot-lamberts, you can use this simple formula to convert:
The luminance in foot-lamberts is equal to the luminance in stilbs multiplied by 2,918.6350793.
For example, here's how to convert 5 stilbs to foot-lamberts using the formula above.
How Many Foot-lamberts Are in a Stilb?
There are 2,918.6350793 foot-lamberts in a stilb, which is why we use this value in the formula above.
Our stilb to foot-lambert calculator automatically converts your luminance measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Stilbs and foot-lamberts are both units used to measure luminance. Keep reading to learn more about each unit.
What Is a Stilb?
A stilb is a unit of luminance equal to 10,000 candelas per sq. meter (cd/m²), the base unit for luminance. CGS luminance unit equal to 10,000 cd/m². [1]
The stilb is classified as a metric and SI-compatible unit of luminance. Stilbs can be abbreviated as sb; for example, 1 stilb can be written as 1 sb.
When working with stilbs (sb) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, stilbs (sb) are widely used across large-scale industrial, bulk, and macro-level luminance specifications within SI metric 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 stilbs (sb) and foot-lamberts (fL), keep full floating-point precision (1 sb = 2,918.6350793 fL; 1 fL = 0.000342626 sb) during intermediate calculations and round only the final foot-lambert figure to match your instrument tolerance.
More Stilb & Foot-lambert Conversions
Need to calculate in the opposite direction? Use our foot-lamberts to stilbs calculator to switch your starting unit immediately. You can also explore related tools such as converting foot-lamberts to stilbs, converting stilbs to candelas per sq. meter (nits), or converting candelas per sq. meter (nits) to kilocandelas per square meter.
Convert from Stilbs
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Length)·Luminance Metrology Standard — Stilbs (sb) to Foot-lamberts (fL)
- [2]BIPM SpecificationBIPM (SI Base Unit: Metre (m))·Unit Specifications: Stilb (cd/cm²) (sb) & Foot-lambert (fL)
- [3]NIST HB 133 ReferenceNIST HB 133 (NIST Handbook 133 (2019 Ed.))·Conversion Factors & Mathematical Basis (sb to fL)