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

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