Physics

Blackbody Radiation Calculator

Calculate Wien peak wavelength and Stefan-Boltzmann radiation power.

Last validated: 2026-02-14

Blackbody Radiation Calculator estimates peak wavelength and emitted power from temperature using blackbody relations. It is useful in physics coursework and thermal-emission intuition building. The tool gives quick numerical outputs from core formulas. Use it to validate hand calculations and scenario comparisons.

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Input Pattern

Enter values in the left panel, keep units explicit, run the calculation, then copy or share the result. Invalid fields are highlighted immediately.

Blackbody Inputs

Result

Peak wavelength (Wien): 499.616 nm

Radiant exitance sigma*T^4: 64168769.431116 W/m²

Total power (area * sigma*T^4): 64168769.431116 W

How to use this tool

Enter absolute temperature and any required area/emissivity inputs.
Run the calculator to compute peak wavelength and radiated power metrics.
Compare outputs across temperature values to analyze trends.

Worked Example

Auto-generated from the tool's current default or entered inputs.

Example Inputs

Temperature k: 5800.0
Area m2: 1.0
Peak wavelength m: 4.996158543103448e-07
Peak wavelength nm: 499.6158543103448
Radiant exitance w m2: 64168769.43111582

Expected Outputs

Temperature k: 5800
Area m2: 1
Peak wavelength m: 0
Peak wavelength nm: 499.615854

Interpretation

Temperature k is 5800.0. Use this as a decision input, not as a standalone conclusion.
Area m2 is 1.0. Use this as a decision input, not as a standalone conclusion.
Peak wavelength m is 4.996158543103448e-07. Use this as a decision input, not as a standalone conclusion.
Confirm unit consistency and operational constraints before applying this result in production or field conditions.

Scenario Compare (A vs B)

Use this to compare two input sets and quantify change in key outputs.

Scenario A

Temperature k

Area m2

Peak wavelength m

Peak wavelength nm

Radiant exitance w m2

Scenario B

Temperature k

Area m2

Peak wavelength m

Peak wavelength nm

Radiant exitance w m2

Confidence and limitations

Outputs are deterministic formula results and depend entirely on input quality and units.
Results are for planning and learning; verify with domain standards before safety-critical use.
Models are idealized and may ignore drag, friction, nonlinearity, and measurement error.

Formula References

SI-unit forms of classical mechanics and wave equations.
Idealized models unless explicitly stated otherwise.

Assumptions

Outputs are deterministic formula results and depend entirely on input quality and units.
Results are for planning and learning; verify with domain standards before safety-critical use.
Models are idealized and may ignore drag, friction, nonlinearity, and measurement error.

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