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HEX to CMYK Converter — Free Online Tool
Convert six-digit sRGB HEX colors to approximate mathematical CMYK channel percentages for rough planning.
JavaScript is needed for the interactive tool. The formula and worked example remain available below.
How to use the HEX to CMYK Converter
Convert six-digit sRGB HEX colors to approximate mathematical CMYK channel percentages for rough planning.
- Enter real measurements or prices in the interactive tool.
- Check unit labels and customize any applicable fees, waste allowances or product-specific rates.
- Review the result, formulas and limitations before using it in purchasing, pricing or production decisions.
HEX to CMYK Converter: formula & methodology
Normalize RGB components to 0–1. K = 1 − max(R,G,B); C, M and Y derive from each component adjusted for K.
The tool uses your entered values and explicitly labeled assumptions. Final results may be rounded for display, while intermediate arithmetic retains available numeric precision. Verify material, tax, device or platform specifications relevant to your situation.
Worked example
#FF0000 converts mathematically to approximately C0%, M100%, Y100%, K0%.
Try the example above and then change values to reflect your own project or comparison.
Frequently asked questions
Can I use this directly for commercial printing?
No. Real press CMYK conversion requires the correct ICC profile, paper, inks and rendering intent.
Why might a print shop produce other CMYK values?
A true color-managed conversion requires an ICC profile and press/paper details; the result here is mathematical, not a print-ready separation.
Which HEX values are supported?
Enter exactly six sRGB hexadecimal digits, for example #3366CC. Three-digit shorthand is not accepted.