Stefan-Boltzmann Law Calculator

Calculate the power radiated by a thermal body using the Stefan-Boltzmann law.

Calculate

Temperature (K)

Surface Area (m²)

Ambient Temperature (K, optional)

Emissivity (0-1)

1 = ideal blackbody

Results

Total Radiated Power: 3.8489e+26 W

Power Density: 6.3201e+7 W/m²

Stefan-Boltzmann Law

P = εσAT⁴

Net radiation: P = εσA(T⁴ - T₀⁴)

σ = 5.670374419 × 10⁻⁸ W/(m²·K⁴)

ε = emissivity (0 to 1)