Stefan-Boltzmann Law Calculator
Free calculate blackbody radiation, power radiated, and emissivity. determine power from temperature using p = εσat⁴ for thermal radiation.
Input Parameters
Blackbody: 1.0, Polished metal: 0.05-0.1
Results
Enter parameters to calculate radiated power
Stefan-Boltzmann Law
Formula
P = εσAT⁴
Where:
- • P = power radiated (W)
- • ε = emissivity
- • σ = Stefan-Boltzmann constant (5.67×10⁻⁸ W/m²·K⁴)
- • A = surface area (m²)
- • T = temperature (K)
Stefan-Boltzmann Constant
σ = 5.670374419×10⁻⁸ W/m²·K⁴
Common Emissivities
- • Blackbody: 1.0
- • Human skin: 0.98
- • Water: 0.96
- • Polished aluminum: 0.05