Free Wien Peak Wavelength Calculator
Find the peak emission wavelength of a blackbody from its temperature using Wien's displacement law: lambda_max = b / T.
K
Peak Wavelength (nm)
501.52 nm
Peak Wavelength0.00000050 m
Peak Wavelength (µm)0.5015 µm
Peak Wavelength (nm) vs Temperature
Wien's Displacement Law
lambda_max = b / T
where b = 2.8978 × 10⁻³ m·K (Wien's displacement constant).
Hotter objects peak at shorter wavelengths. The Sun (5778 K) peaks at about 502 nm (green-yellow visible light). A human body (310 K) peaks at about 9.35 µm (infrared).
Example Calculation
The Sun at T = 5778 K.
- 01lambda_max = 2.8978e-3 / 5778
- 02= 5.016e-7 m = 501.6 nm
- 03This is in the green part of the visible spectrum.