Luminance Converter
Convert between 9 luminance units instantly. Enter a value, pick your units and get the result with the formula, a full conversion table and worked examples.
100 fL in all luminance units
Updates live as you type. Click a row to set it as the target unit.
| Unit | Symbol | Value |
|---|---|---|
| Apostilb | asb | 1,076.39 |
| Candela per sq metre | cd/m² | 342.626 |
| Nit | nt | 342.626 |
| Foot lambert | fL | 100 |
| Candela per sq foot | cd/ft² | 31.831 |
| Candela per sq inch | cd/in² | 0.221049 |
| Lambert | L | 0.107639 |
| Candela per sq centimetre | cd/cm² | 0.0342626 |
| Stilb | sb | 0.0342626 |
How to Convert Luminance Units
Luminance is the luminous intensity emitted per unit area in a given direction, which is how bright a display or surface appears. The SI unit is candela per square metre (cd/m²), also called the nit.
Every unit on this page is stored as a fixed factor relative to one reference unit, the candela per sq metre (cd/m²). Converting is a two step multiply and divide:
- Multiply your value by the factor of the source unit to get the value in cd/m².
- Divide that result by the factor of the target unit.
Foot lambert to Nit conversion table
| Foot lambert (fL) | Nit (nt) |
|---|---|
| 1 fL | 3.42626 nt |
| 2 fL | 6.85252 nt |
| 3 fL | 10.2788 nt |
| 4 fL | 13.705 nt |
| 5 fL | 17.1313 nt |
| 6 fL | 20.5576 nt |
| 7 fL | 23.9838 nt |
| 8 fL | 27.4101 nt |
| 9 fL | 30.8363 nt |
| 10 fL | 34.2626 nt |
| 15 fL | 51.3939 nt |
| 20 fL | 68.5252 nt |
| 25 fL | 85.6565 nt |
| 30 fL | 102.788 nt |
| 40 fL | 137.05 nt |
| 50 fL | 171.313 nt |
| 75 fL | 256.969 nt |
| 100 fL | 342.626 nt |
| 250 fL | 856.565 nt |
| 500 fL | 1,713.13 nt |
| 1,000 fL | 3,426.26 nt |
Luminance Units and Conversion Factors
Value of one unit expressed in cd/m².
| Unit | Symbol | In cd/m² |
|---|---|---|
| Apostilb | asb | 0.3183098862 |
| Candela per sq metre | cd/m² | 1 |
| Nit | nt | 1 |
| Foot lambert | fL | 3.4262591 |
| Candela per sq foot | cd/ft² | 10.76391042 |
| Candela per sq inch | cd/in² | 1,550.0031 |
| Lambert | L | 3,183.098862 |
| Candela per sq centimetre | cd/cm² | 10,000 |
| Stilb | sb | 10,000 |
Frequently Asked Questions
What is the SI unit of luminance?
The SI unit of luminance is the candela per sq metre (cd/m²). Luminance is the luminous intensity emitted per unit area in a given direction, which is how bright a display or surface appears.
How do I convert nt to fL?
To convert nit (nt) to foot lambert (fL), multiply the value in nt by 0.291864. For example, 1 nt = 0.291864 fL.
How do I convert fL to nt?
To convert foot lambert (fL) to nit (nt), multiply the value in fL by 3.42626. For example, 1 fL = 3.42626 nt.
How do I convert lambert to cd/m²?
To convert lambert (L) to candela per sq metre (cd/m²), multiply the value in lambert by 3,183.1. For example, 1 L = 3,183.1 cd/m².
Can I see a value in every luminance unit at once?
Yes. Enter a value and choose the source unit; the "all units" table below the converter instantly lists the equivalent in all 9 supported units. Click any row to make it the target unit.
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