Calculate Color Rendering Index (CRI) from Spectral Power Distribution (SPD)
This online CRI calculator takes a spectral power distribution (SPD) input in either 1 nm or 2 nm resolution, and calculates the Color Rendering Index (general and extended), including the individual R values. 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.
- CRI values are not calculated for non-white sources. If you do not see a CRI result, confirm that your light source has a DC < 0.0054.
SPD Input
Calculated CRI General (R1-R8):
-Calculated CRI Extended (R1-R15):
-CRI Individual R Values Result
- Score:
- 25
- 50
- 75
- 100
Want to learn more?
Visit our product support center to learn more about our products. Download spec sheets, test reports and reach out to us with any questions.