Free Stefan-Boltzmann Calculator
Calculate thermal radiation power using the Stefan-Boltzmann law: P = epsilon * sigma * A * T^4.
m²
K
Radiated Power
56,704.00 W
Radiated Power (kW)56.7040 kW
Radiated Power vs Emissivity (0-1)
Stefan-Boltzmann Law
Every object radiates thermal energy proportional to the fourth power of its temperature.
Formula
P = epsilon * sigma * A * T^4
where sigma = 5.6704 x 10^-8 W/(m²·K^4) is the Stefan-Boltzmann constant and epsilon is the emissivity (1 for a perfect black body).
Example Calculation
A perfect black body (epsilon=1) at 1000 K with 1 m² surface area.
- 01P = epsilon * sigma * A * T^4
- 02P = 1 * 5.6704e-8 * 1 * 1000^4
- 03P = 5.6704e-8 * 1e12
- 04P = 56,704 W = 56.7 kW
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