About this tool
Find the power radiated by a surface from its temperature, area and emissivity.
P = ε·σ·A·(T⁴ − T_amb⁴) with σ = 5.670374419 × 10⁻⁸ W/(m²·K⁴). Temperatures are absolute (kelvin).
Formula: P = εσA(T⁴ − T_a⁴)
Example: Emissivity (0–1) = 1, Area (m²) = 1, Surface temperature (K) = 5,778, Surroundings temperature (K) = 0 → Net radiated power (W) = 63,200,699.735.
Set the surroundings to 0 K for the total emitted power.
Quick steps
- Enter your values — every field shows its unit.
- Press Calculate (or Try an example to see how it works).
- Read the results and copy them if you need them elsewhere.
The calculation runs in your browser. Nothing you type is sent to 1CLIK.
FAQ
How does the Stefan–Boltzmann Law Calculator work?
P = ε·σ·A·(T⁴ − T_amb⁴) with σ = 5.670374419 × 10⁻⁸ W/(m²·K⁴). Temperatures are absolute (kelvin).
What should I keep in mind?
Set the surroundings to 0 K for the total emitted power.
Is my data sent anywhere?
No. The numbers stay on your device; the page only shows the result.