RGB to CMYK Converter
Convert RGB color values to CMYK percentages instantly using the standard RGB to CMYK formula.
Red (R)
33
Green (G)
150
Blue (B)
243
CMYK Result:
86%
38%
0%
5%
Color Preview:
What is an RGB to CMYK Converter?
RGB (Red, Green, Blue) is an additive color model used for screens, while CMYK (Cyan, Magenta, Yellow, Key/Black) is a subtractive model used for print. Because the two models mix color differently, converting between them requires a formula rather than a direct lookup — this tool applies the standard RGB to CMYK formula so you get accurate print-ready values from an on-screen color.
Example
RGB (33, 150, 243) converts to approximately cmyk(86%, 38%, 0%, 5%). The K (black) value comes from the darkest channel, and C, M, and Y are scaled relative to it.
Common Use Cases
- Preparing a screen color for print design, where CMYK is the standard color model.
- Checking how a brand's RGB color will translate to ink percentages on a printer.
- Converting a color picked from a design tool for use in print-ready templates.
FAQs
Why does RGB to CMYK need a formula instead of a direct table?
RGB and CMYK represent color using entirely different models — additive light versus subtractive ink — so there's no one-to-one mapping. The formula approximates the closest CMYK values, though actual printed colors can vary by printer and ink profile.
What's the formula used for RGB to CMYK conversion?
K = 1 − max(R', G', B'), where R', G', B' are the RGB values divided by 255. Then C = (1 − R' − K) / (1 − K), M = (1 − G' − K) / (1 − K), and Y = (1 − B' − K) / (1 − K), each expressed as a percentage.
Does this tool also convert CMYK back to RGB?
This page converts RGB to CMYK only. Use our separate CMYK to RGB converter if you need to go the opposite direction.