Four percentages become three channels
After dividing percentages by 100, the model uses R = 255 × (1 − C) × (1 − K), with M and Y producing G and B. Output channels are rounded to whole bytes.
ONELESS / COLOR
CMYK to RGB
CMYK to RGB provides a quick mathematical screen-color estimate from cyan, magenta, yellow and black percentages. Keep the four inputs beside a large preview, read the resulting RGB channels and copy a HEX or RGB value. This is useful for rough reference and learning, with the limits of a profile-free conversion kept visible.
Open CMYK to RGB. JavaScript powers the workspace; the full guide is available below.
UNDERSTAND THE RESULT
Color, with a little context.
Black scales every output channel
At K = 100%, all three RGB channels are zero regardless of the other percentages. With every CMYK input at zero, the mathematical result is white.
An estimate is not a printing proof
Actual CMYK appearance depends on ink, paper, printer and the selected ICC profile. This tool uses no profile, gamut mapping or rendering intent and cannot promise a match to a physical print.
HOW TO USE IT
From a starting point to a usable result.
- Enter C, M, Y and K as percentages from 0 to 100. Decimal values and a trailing percent sign are accepted.
- Inspect the approximate screen color and the three channel cards. Correct any invalid field before copying.
- Copy RGB for a CSS rgb() value or HEX for a compact screen-color code. Reset returns the sample percentages.
A WORKED EXAMPLE
A simple red estimate
Enter C 0%, M 100%, Y 100%, K 0%. The formula returns rgb(255, 0, 0), or #FF0000. This mathematical endpoint does not assert that a real printer produces the same vivid screen red.
EVERYDAY USES
Make the next small decision easier.
Check the direction of a change
Increase black to see how the simple model reduces every RGB channel, or vary one ink percentage to understand its contribution.
Make a rough reference note
Copy a clearly labeled screen approximation for an early draft. Replace it with a profile-aware conversion when preparing production artwork.
LOCAL WORKSPACE
Your work stays in this browser.
The tool processes color values locally. It does not upload the input to a processing server or save it in browser storage. Leaving or reloading the page clears the working state. Copying places the selected result on your clipboard; sharing sends only the page address without your working values.
These tools describe sRGB colors. Browser decoding, color management and the display can affect what you see; they are not an ICC proofing workflow or a print-color guarantee. Read the site privacy policy for information about the surrounding website.
KEEP IT NEARBY
One less search next time.
Press Ctrl + D on Windows or Command + D on Mac to bookmark this page. Your browser may also offer Create shortcut or Add to Home Screen. Shortcuts open the tool; they do not include your colors or images.
Choose a shortcut icon
Soft Coral
Warm Peach
Sunset Orange
OneLess Blue
Rose PinkQUESTIONS, ANSWERED
A few useful details.
Will this match my printed sample?
There is no such guarantee. A print workflow needs the relevant output profile, material and device conditions.
Does the tool upload an ICC file?
No. It processes four percentages locally and does not accept profiles.
Why can different CMYK inputs produce the same RGB?
The simple equations do not have a unique inverse. Black and the other channels can trade contributions, and byte rounding can also collapse nearby results.
Why does RGB use integers?
The copied output is an 8-bit screen representation. Calculations retain fractions until the displayed and exported bytes are rounded.
What units should I use for the CMYK inputs?
Enter cyan, magenta, yellow and black as percentages from 0 to 100. Decimal percentages are accepted; do not enter an RGB byte value such as 255.
What does 100% K produce in the profile-free calculation?
It produces RGB black: 0, 0, 0. This describes the mathematical estimate, not the appearance of ink on a particular paper.
Can I use the RGB result on a website?
Yes, as an approximate screen color. Keep the original print specification separately because an RGB value cannot preserve a press profile or ink recipe.
REFERENCES
ANOTHER SMALL STEP
Keep the next tool close.
Ready for a little more color?
A screen-color estimate from four ink percentages.
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