RGB to CMYK Converter
Gives the CMYK percentages for an RGB colour.
CMYK
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Share sends a link that reopens these numbers. Copy details pastes the full breakdown as a list.
Cyan — %
Magenta — %
Yellow — %
Black — %
Reading this —
The formula
K = 1 − max(R, G, B) C = (1 − R − K) ÷ (1 − K)
R, G and B run from 0 to 1 here. Magenta and yellow follow the same pattern from G and B.
What to watch out for
Screens can show bright colours that ink cannot reach, so vivid colours often print duller.
Frequently Asked Questions
What is rgb(51, 102, 204) in CMYK?
75%, 50%, 0%, 20%.
What is black in CMYK?
0%, 0%, 0%, 100% by this formula. Printers often add other inks for a richer black.