Kelvin to watts per square meter
Type a value in K to get it in W/m² instantly.
459.3W/m²
That's 1.04× as hot as the Earth’s surface, while a person is 1.03× hotter. It radiates about 459.3 W from every square meter.
Convert the other way: W/m² to K
What it means
How much does it radiate?
These are for a perfect black body. A real surface radiates its emissivity times as much — around 0.95 for skin and paint, 0.05 for polished metal.
The math
How to convert K to W/m²
Two laws at once: W/m² = 5.670 × 10⁻⁸ × T⁴ for the power, and peak nm = 2,897,772 ÷ T for the color.
Example: 300 K = 459.3 W/m².
Every unit
Your temperature in every unit
Tables
K to W/m² conversion table
| K | W/m² |
|---|---|
| 3 K | 4.593×10⁻⁶ W/m² |
| 100 K | 5.67037 W/m² |
| 288 K | 390.105 W/m² |
| 300 K | 459.3 W/m² |
| 500 K | 3,543.98 W/m² |
| 1,000 K | 56,703.7 W/m² |
| 2,000 K | 907,260 W/m² |
| 3,000 K | 4,593,000 W/m² |
| 5,778 K | 63,200,700 W/m² |
| 10,000 K | 567,037,000 W/m² |
W/m² to K conversion table
| W/m² | K |
|---|---|
| 3 W/m² | 85.2859 K |
| 100 W/m² | 204.926 K |
| 288 W/m² | 266.959 K |
| 300 W/m² | 269.698 K |
| 500 W/m² | 306.436 K |
| 1,000 W/m² | 364.416 K |
| 2,000 W/m² | 433.366 K |
| 3,000 W/m² | 479.598 K |
| 5,778 W/m² | 564.991 K |
| 10,000 W/m² | 648.033 K |
Quick answers
Quick answers
- How many W/m² is 1 K?
- 1 K is 5.67×10⁻⁸ W/m².
- How many W/m² is 10 K?
- 10 K is 0.000567037 W/m².
- How many W/m² is 300 K?
- 300 K is 459.3 W/m².
The units
About these units
Kelvin (K)
Absolute temperature, which is what the law needs.
Watts per square meter (W/m²)
The power radiated from each square meter.
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