CMYK to RGB converter
Enter the cyan, magenta, yellow and black percentages and get RGB values for CSS, code and screen design tools.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Enter cyan (c), magenta (m), yellow (y) and black (k).
- The result appears straight away and updates as you edit.
- Copy the result, or copy a link that keeps the same values to share it.
How it is calculated
With the percentages as fractions: R = 255 × (1 - C) × (1 - K), G = 255 × (1 - M) × (1 - K), B = 255 × (1 - Y) × (1 - K). Then: The channels are rounded to whole numbers from 0 to 255.
Example
Inputs: Cyan (C) = 60 %, Magenta (M) = 20 %, Yellow (Y) = 0 %, Black (K) = 20 %. Result: RGB code: rgb(82, 163, 204); Red (R): 82; Green (G): 163.
Limits and caveats
- CMYK uses the naive device-independent formula with no ICC profile, so it will not match a specific press, paper or ink.
- RGB channels are rounded to whole numbers, so nearby inputs can give the same result.
- All values are treated as sRGB, the default web color space, not Display P3 or Adobe RGB.
Questions about this tool
What does K do in the conversion to RGB?
K acts as an overall darkener: every channel is multiplied by (1 minus K), so K = 100% gives black whatever the other values are.
In what form do I enter CMYK values?
Enter each channel as a percentage from 0 to 100, as design apps show it, not as a fraction from 0 to 1.
Why are the RGB values whole numbers?
Each channel of a standard 8-bit screen color has 256 levels, 0 to 255, so the result is rounded to the nearest whole number.