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Black Body Stefan-Boltzmann Flux Calculator

P/A = σT⁴ — radiation flux from a perfect black body.

Calculates the total radiated power per unit area from a black body at a given temperature using the Stefan-Boltzmann law.

Nadia Almasri By Nadia Almasri
Published Last reviewed 1 min read

Inputs

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

j* = σT⁴; σ = 5.670×10⁻⁸ W/(m²·K⁴)

In depth

Calculates the total radiated power per unit area from a black body at a given temperature using the Stefan-Boltzmann law.