Kelvin to peak wavelength
Type a value in K to get it in nm instantly.
526.9nm
That's about the same as midday daylight. That is cool light: daylight and the blue-white of an overcast sky.
What it means
What color is that light?
Color temperature strictly describes a glowing black body. LEDs and fluorescents get a "correlated" temperature: the nearest match, not a real one.
The math
How to convert K to nm
Mireds are the reciprocal of kelvin: mireds = 1,000,000 ÷ K, and back again K = 1,000,000 ÷ mireds. Peak wavelength comes from Wien’s law, λ = 2,897,772 ÷ K nanometers.
Example: 5,500 K = 526.868 nm.
Every unit
Your color temperature in every unit
Tables
K to nm conversion table
| K | nm |
|---|---|
| 1,800 K | 1,609.87 nm |
| 2,200 K | 1,317.17 nm |
| 2,700 K | 1,073.25 nm |
| 3,200 K | 905.554 nm |
| 4,000 K | 724.443 nm |
| 5,000 K | 579.554 nm |
| 5,500 K | 526.868 nm |
| 6,500 K | 445.811 nm |
| 7,500 K | 386.37 nm |
| 10,000 K | 289.777 nm |
nm to K conversion table
| nm | K |
|---|---|
| 1,800 nm | 1,609.87 K |
| 2,200 nm | 1,317.17 K |
| 2,700 nm | 1,073.25 K |
| 3,200 nm | 905.554 K |
| 4,000 nm | 724.443 K |
| 5,000 nm | 579.554 K |
| 5,500 nm | 526.868 K |
| 6,500 nm | 445.811 K |
| 7,500 nm | 386.37 K |
| 10,000 nm | 289.777 K |
Quick answers
Quick answers
- How many nm is 1 K?
- 1 K is 2,897,770 nm.
- How many nm is 10 K?
- 10 K is 289,777 nm.
- How many nm is 5,500 K?
- 5,500 K is 526.868 nm.
The units
About these units
Kelvin (K)
The standard scale: the temperature a glowing body would need to look this color.
Peak wavelength (nm)
The wavelength a black body at this temperature radiates most strongly, by Wien’s law.
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