Stefan Boltzmann Calculator
What net thermal radiation is exchanged with the surroundings? Enter the stated inputs to calculate this model.
Result for the values shown.
Calculations run in your browser.
What to enter
| Input | Meaning and units |
|---|---|
| Emissivity (1) | Enter emissivity in 1; use the same basis as the other measurements. |
| Area (m²) | Area in square metres. Convert both dimensions consistently before multiplying them. |
| Surface temperature (K) | Enter surface temperature in K; use the same basis as the other measurements. |
| Surrounding temperature (K) | Enter surrounding temperature in K; use the same basis as the other measurements. |
Understanding your result
Read Net outward radiation (W) in the units and model stated on this page. The formula power=emissivity*5.670374419e-8*area*(T^4-surroundings^4) defines the relationship; measurement accuracy and model applicability are separate from numerical precision.
Common mistakes
- Mixing input units or changing the physical meaning of a variable without changing the model.
Check your calculation
- Use the worked example as a known reference case, then change one input at a time and check the direction and units of the response.
Calculation checks, sources and review limits
What net thermal radiation is exchanged with the surroundings?
What net thermal radiation is exchanged with the surroundings? Enter the stated inputs to calculate this model.
Common uses
- What net thermal radiation is exchanged with the surroundings
How it works
power=emissivity*5.670374419e-8*area*(T^4-surroundings^4)
Worked example
Enter Emissivity: 1 1; Area: 2 m²; Surface temperature: 300 K; Surrounding temperature: 300 K. Results: Net outward radiation: 0 W.