Calculate CIE 1931 xy Coordinates from Spectral Power Distribution (SPD)
This online CIE 1931 xy calculator takes a spectral power distribution (SPD) input in either 1 nm or 2 nm resolution, and calculates the CIE 1931 xy coordinates. Click on "Input SPD" to load your SPD. Several notes on the SPD input:
- For best results, copy and paste irradiance data from a spreadsheet program or plain text editor, with line breaks between each wavelength data point.
- Wavelength range is 380 - 780 nm.
- Irradiance values are in arbitrary units. The calculator will automatically normalize all values.
- Need to convert from a CCT value to CIE 1931 xy instead? See our CCT to CIE xy calculator here.
CIE 1931 xy Result:-
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