Stefan–Boltzmann Law Calculator
Calculate gray-body radiated power using P=σ ε A T⁴, with area in square meters and temperature in kelvin.
Total radiated power:
A QUICK WALKTHROUGH
How to use this tool
- Enter emissivity, area and absolute temperature.
- Calculate total emitted power.
- Interpret this as an ideal gray-body estimate.
Model and limits
Calculates total emitted power P=σ ε A T⁴, not net exchange with surroundings. Assumes a uniform-temperature gray surface with constant emissivity; real spectra, geometry and surroundings are not modeled. Inputs are calculated locally and not uploaded or saved.
GOOD TO KNOW
Common questions
Should temperature be Celsius?
No. Use absolute temperature in kelvin.
Is this net heat transfer?
No. Ambient radiation is not subtracted.