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RGB to CMYK Converter

Turn screen RGB values into CMYK ink percentages for print.

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CMYK
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Quick Tool Overview

The RGB to CMYK Converter turns red, green and blue channel values into cyan, magenta, yellow and black percentages, shows the ink coverage of each plate, and lists the colour in every other common notation.

What it does
Converts RGB colours to CMYK percentages
You give it
RGB channels, any colour notation or a picked colour
You get back
CMYK values, ink coverage and every format
Best for
Preparing screen colours for print
Converters Free, unlimited use No sign-up Runs in your browser

About the RGB to CMYK Converter

Screens make colour by adding red, green and blue light; printers make it by laying cyan, magenta, yellow and black ink on paper. A logo, a brand palette or a web graphic designed in RGB needs CMYK values before it goes to a print shop, a packaging supplier or a sign maker.

Enter the red, green and blue channels — or paste any colour notation, or use the picker — and the converter gives the CMYK percentages with the working formula, an ink coverage bar for each plate and the total ink. The same colour is also listed as HEX, HSL, HSV, OKLCH and CIELAB, with its contrast against white and black text. The page is honest about the limit: this is the standard mathematical conversion, and a press applies its own ICC profile.

Key features of the RGB to CMYK Converter

Ink coverage bars

Each plate is drawn as a bar, with the total ink percentage underneath.

Any input format

Type channels, paste rgb() or HEX, or use the colour picker.

Formula shown

The K and CMY calculation is written out, so the numbers can be checked.

Every notation

HEX, RGB, HSL, HSV, OKLCH and CIELAB of the same colour, each one click to copy.

Contrast figures

WCAG contrast against white and black text is shown on the swatch.

How to use the RGB to CMYK Converter

  1. 1

    Enter the RGB values

    Type red, green and blue from 0 to 255, paste a colour, or pick one.

  2. 2

    Read the CMYK

    Cyan, magenta, yellow and key percentages appear with the formula used.

  3. 3

    Check the ink coverage

    Bars show each plate, and the total tells you how heavy the colour will print.

  4. 4

    Copy any format

    Every notation of the colour is listed with its own copy button.

Frequently asked questions

Scale R, G and B to 0–1. K is 1 minus the largest of them; C is (1 − R − K) ÷ (1 − K), and M and Y follow the same pattern with G and B.

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