Stefan–Boltzmann
P = εσAT⁴.
Inputs
Results
Power (W)
914.33
How to Use This Calculator
- Enter the blackbody surface temperature T (K).
- Set the emitting surface area (m2).
- Enter emissivity (1.0 for perfect blackbody, 0.95 for most non-metallic surfaces, 0.05 for polished aluminum).
- Review total radiated power in watts.
- Use for thermal engineering, building energy analysis, or stellar luminosity estimates.
How the result changes with T (K)
| T (K) | Power (W) |
|---|---|
| 10,000,000 | 990,047,373,557,400,000,000 |
| 35,000,000 | 148,568,983,994,457,340,000,000 |
| 65,000,000 | 1,767,296,439,760,806,200,000,000 |
| 90,000,000 | 6,495,700,817,910,101,000,000,000 |
What each input means
- T (K)
- Absolute temperature in Kelvin. Human body is about 310 K; Sun surface is about 5778 K.
- Area (m²)
- Surface area of the radiating body in square meters. Average human body surface area is about 1.7-1.9 m2.
- ε
- Emissivity of the surface (0-1). Human skin is about 0.97; polished metal can be below 0.1.
How this is calculated
Formula
P = ε × σ × A × T⁴Related Calculators
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