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PHYSICS / THERMAL RADIATION

Stefan Boltzmann Net Power Calculator

Estimate net thermal-radiation power between a surface and large surroundings. Review the symbolic equation, substituted SI values, assumptions, and result together.

  • 01 Calculated in this tab
  • 02 Values stay in this browser tab
  • 03 Use boundary

Conversion input

Known value

Filter by unit name, symbol, or code. Your current selections remain available.

Preparing the calculator...

Use boundary

Calculation path

Estimate net thermal-radiation power between a surface and large surroundings. The page evaluates the displayed equation from your supplied values and presents both symbolic and substituted KaTeX working so the arithmetic can be checked.

Calculation path

P=epsilon sigma A(T^4-T_s^4)

What you provide

What you provide

  • Surface emissivity, using the same scenario as the other inputs
  • Radiating area expressed in m^2, using the same scenario as the other inputs
  • Object temperature expressed in K, using the same scenario as the other inputs
  • Surroundings temperature expressed in K, using the same scenario as the other inputs

What you receive

What you receive

  • Net radiative power in W from the stated equation
  • A symbolic formula plus substituted working with your values
  • Visible assumptions, field guidance, and an authoritative learning reference

Use boundary

Choose the maximum decimal places shown. This does not increase source accuracy.

Temperatures are absolute, emissivity is gray and constant, view factor is one, and convection or conduction is excluded.

Use internally consistent units and retain extra precision when carrying the result into another calculation.

Reviewed reference factors

Reviewed reference factors