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# Calculator for Ideal Black Bodies

## Calculate black body radiation with the Stefan-Boltzmann law

An ideal black body is a theoretical model for something which absorbs every incoming electromagnetic radiation. Practically, this model is used e.g. for stars and furnaces. The radiation of a black body can be calculated with the Stefan-Boltzmann law.

Please enter two values and select the units. The third value will be calculated.

The formula is P = σ * A * T^{4} with the Stefan-Boltzmann constant σ = 5,670367 * 10^{-8} W / m^{2} / K^{4}

Example: the Sun with its surface area of 6087799000000 square kilometers and surface temperature of 5778 Kelvin has a radiant power of 384.75 exawatts (10^{18} watts). The radiant power per square meter is 63.2 megawatts.

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