Blackbody Radiation Calculator

Your details

Choose Kelvin, Celsius, or Fahrenheit. The calculator converts to Kelvin internally.
Surface temperature of the emitting body. Default is the Sun's effective surface temperature (5778 K).
K
Ratio of actual emission to a perfect blackbody (0 = perfect reflector, 1 = ideal blackbody). Use 1 for theoretical blackbody calculations.
Radiating surface area in square metres. Used to calculate total emitted power.
m²
Wavelength at which to evaluate spectral radiance using Planck's law. 500 nm is mid-visible green light.
nm
Peak wavelength (Wien)Visible peak
501.5nm

Wavelength of maximum spectral radiance from Wien's displacement law

Spectral regionVisible light
Emissive power (M)63,200,699.735W/m²
Total radiated power63,200,699.735W
Spectral radiance at chosen wavelength26,375.6699W/sr/m²/nm
Peak spectral radiance26,376.2555W/sr/m²/nm
501.5 nm
X-ray / EUV<100Ultraviolet100-400Visible400-700Near-IR700-1000SWIR1000-3000Mid/Far-IR3000+

Peak at 501.5 nm: Visible light

  • The peak emission falls at 501.5 nm, in the visible light region of the spectrum.
  • Each square metre of surface radiates 63.20 MW/m² (Stefan-Boltzmann law).
  • The total surface emits 63.201 MW from 1 m².
  • Doubling the temperature to 11556 K would multiply radiated power by 16x (fourth-power scaling).

Next stepThe peak is in the visible band - this object emits most of its energy as light that human eyes can detect. It appears bright white or blue-white.

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