Blackbody Peak Wavelength Calculator
Apply λmax = b/T for spectral radiance expressed per unit wavelength.
A QUICK WALKTHROUGH
How to use this tool
- Enter a positive absolute temperature in kelvin.
- Calculate with b = 2.897771955 × 10⁻³ m·K.
- Read the peak wavelength in metres, micrometres, and nanometres.
Fixed law and units
The calculator uses Wien’s displacement constant b = 2.897771955 × 10⁻³ m·K and requires kelvin. It reports the same wavelength in m, µm, and nm.
Exact model scope
This is the peak of ideal-blackbody spectral radiance per unit wavelength (Bλ). A peak expressed per unit frequency uses a different form and cannot be obtained by simply converting this wavelength peak. Real emitters may differ.
GOOD TO KNOW
Common questions
Can I enter Celsius?
No. Convert to absolute temperature in kelvin first.
Is this the peak of every spectrum representation?
No. The displayed peak is specifically for spectral radiance per unit wavelength.