Enter cyan, magenta, yellow, and black percentages to calculate an RGB preview.
Verify RGB/HEX, total area coverage, luminance and CMYK round-trip behavior.
| Measure | Value | Meaning |
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HEX/RGB/HSL/HSV/OKLCH conversions are numerical color-model operations. CMYK output is an RGB-derived approximation rather than ICC-profiled print proofing. WCAG contrast ratios measure luminance contrast only and do not certify a full interface. Color-blindness previews are design simulations, not medical tests.
CMYK values describe ink-like components, while RGB describes emitted-light components. A simple device-independent formula is useful for quick estimation, but professional conversions depend on ICC profiles, rendering intent, paper and ink conditions.
CMYK channels are commonly entered as percentages from 0 to 100, while formulas use fractions from 0 to 1. Confirm the input convention before comparing a manual result or code implementation.
In the simple conversion, K reduces all three RGB channels. A 100% K input should approach RGB 0,0,0, while 0% in all CMYK channels should approach RGB 255,255,255. These endpoints are useful sanity checks.
Converting CMYK to RGB and then back to CMYK does not guarantee the original four values because multiple CMYK combinations can map to similar RGB colors. Treat round-trip differences as a model limitation rather than automatically as a calculator defect.
If the color is for branding, proofing or production printing, use the profile specified by the printer or design workflow and compare a soft proof or physical proof. Browser sRGB display cannot validate the final appearance of process inks on paper.
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