About the CMYK to RGB Converter
This converter changes a colour from CMYK to RGB. You type the CMYK value into four number boxes for cyan, magenta, yellow and black, and the RGB value appears at once, together with a swatch so you can see the colour. Each ink percentage is turned into a fraction, and red, green and blue are 255 × (1 − ink) × (1 − black) for the matching ink. Out-of-range values are explained instead of being silently changed. The result can be copied with one tap. Everything is calculated in your browser, so nothing you type is uploaded.
Updated October 2026
How to use the CMYK to RGB Converter
- 1Enter the CMYK value in the boxes.
- 2Watch the colour swatch change.
- 3Read the RGB value in the large result box.
- 4Check the second line for the matching value in another notation.
- 5Press Copy result to keep it.
Why convert CMYK to RGB
Print specifications give CMYK values, but a website, a slide or an app needs RGB or hex. This conversion shows how the colour will look on a screen, with a swatch you can compare with the printed sample.
The same colour can be written in several notations, and each tool or file format prefers one. Having a quick converter means you do not have to guess or repeat the sum by hand when you move a colour from one place to another.
How the CMYK to RGB conversion works
Each ink percentage is turned into a fraction, and red, green and blue are 255 × (1 − ink) × (1 − black) for the matching ink.
For cmyk(0%, 47%, 100%, 0%), red is 255 × 1 × 1 = 255, green is 255 × 0.53 = 135 and blue is 255 × 0 = 0, so the colour is rgb(255, 135, 0). Converting the same orange to CMYK and back can be one unit off because of rounding.
- 100 percent black is black.
- 0, 0, 0, 0 is white.
- Printers use colour profiles for exact matches.
Limits and good habits
Values outside the allowed range, such as an RGB channel above 255 or a percentage above 100, are rejected with a message. Round-trip conversions can drift by one unit because of rounding. If you need a colour to match exactly in print, use the profile supplied by your printer.
The Color Converter on this site shows HEX, RGB, HSL, HSV and CMYK together for one colour, and the Color Contrast Checker tells you whether two colours are readable together.
Phone and computer
On a phone, tap each box and type; the swatch and the RGB value update as you go. On a computer the boxes sit on the left and the result on the right. The page works the same on both, and the Copy button gives you the value to paste into your design tool or style sheet. The reverse is the RGB to CMYK Converter, and the HEX to RGB Converter covers web colours.
Features
- CMYK to RGB as you type
- Colour swatch
- Clear messages for values out of range
- Copy the result
- Private: nothing is uploaded
- Works on phone and computer
Frequently asked questions
How do I convert CMYK to RGB?
Each ink percentage is turned into a fraction, and red, green and blue are 255 × (1 − ink) × (1 − black) for the matching ink. For cmyk(0%, 47%, 100%, 0%), red is 255 × 1 × 1 = 255, green is 255 × 0.53 = 135 and blue is 255 × 0 = 0, so the colour is rgb(255, 135, 0). Converting the same orange to CMYK and back can be one unit off because of rounding.
What is the CMYK to RGB formula?
Each ink percentage is turned into a fraction, and red, green and blue are 255 × (1 − ink) × (1 − black) for the matching ink.
What is cmyk(0%, 47%, 100%, 0%) as RGB?
rgb(255, 135, 0). For cmyk(0%, 47%, 100%, 0%), red is 255 × 1 × 1 = 255, green is 255 × 0.53 = 135 and blue is 255 × 0 = 0, so the colour is rgb(255, 135, 0). Converting the same orange to CMYK and back can be one unit off because of rounding.
Are the CMYK to RGB results exact?
The calculation is exact, but the values are rounded to whole numbers or whole percentages for display, so converting back and forth can differ by one unit.
Why does the colour look different on my screen and on paper?
Screens emit light and paper reflects it, and every screen and printer has its own profile. The converter gives the standard mathematical values; for print jobs, check a printed proof.
Is my input uploaded?
No. The conversion is done in your browser, and nothing is sent to a server.