Foot-lamberts to Stilbs Converter
Enter the luminance in foot-lamberts below to convert it to stilbs.
Convert Foot-lamberts to Stilbs
Enter a value in foot-lamberts (fL) to convert to stilbs (sb).
Foot-lambert to Stilb Conversion Table
Table showing various foot-lambert measurements converted to stilbs. Click any preset value or arrow to load it into the converter.
| Foot-lamberts (fL) | Stilbs (sb) |
|---|---|
| 1 fL | 0.000342626 sb |
| 2 fL | 0.000685252 sb |
| 2.5 fL | 0.000856565 sb |
| 5 fL | 0.0017131 sb |
| 10 fL | 0.0034263 sb |
| 15 fL | 0.0051394 sb |
| 20 fL | 0.0068525 sb |
| 25 fL | 0.0085656 sb |
| 30 fL | 0.0102788 sb |
| 50 fL | 0.0171313 sb |
How to Convert Foot-lamberts to Stilbs
To convert foot-lamberts to stilbs, multiply the luminance by the following conversion ratio: 0.000342626 stilbs/foot-lambert.
Since one foot-lambert is equal to 0.000342626 stilbs, you can use this simple formula to convert:
The luminance in stilbs is equal to the luminance in foot-lamberts multiplied by 0.000342626.
For example, here's how to convert 5 foot-lamberts to stilbs using the formula above.
How Many Stilbs Are in a Foot-lambert?
There are 0.000342626 stilbs in a foot-lambert, which is why we use this value in the formula above.
Our foot-lambert to stilb calculator automatically converts your luminance measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Foot-lamberts and stilbs are both units used to measure luminance. Keep reading to learn more about each unit.
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). [1]
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.
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. [2]
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.
When converting luminance between foot-lamberts (fL) and stilbs (sb), keep full floating-point precision (1 fL = 0.000342626 sb; 1 sb = 2,918.6350793 fL) during intermediate calculations and round only the final stilb figure to match your instrument tolerance.
More Foot-lambert & Stilb Conversions
Need to calculate in the opposite direction? Use our stilbs to foot-lamberts calculator to switch your starting unit immediately. You can also explore related tools such as converting stilbs to foot-lamberts, converting candelas per sq. meter (nits) to stilbs, or converting candelas per sq. meter (nits) to kilocandelas per square meter.
Convert from Foot-lamberts
Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Length)·Luminance Metrology Standard — Foot-lamberts (fL) to Stilbs (sb)
- [2]BIPM SpecificationBIPM (SI Base Unit: Metre (m))·Unit Specifications: Foot-lambert (fL) & Stilb (cd/cm²) (sb)
- [3]NIST HB 133 ReferenceNIST HB 133 (NIST Handbook 133 (2019 Ed.))·Conversion Factors & Mathematical Basis (fL to sb)