RGB to CMYK Converter
Enter red, green, and blue values to get an estimated CMYK breakdown for print reference. Copy the result as a starting point for a print workflow.
#6366F1
Click to change color
Red99
Green102
Blue241
Hue239
Saturation84
Lightness67
HSV / HSB
H239°
S59%
V95%
CMYK
C59%
M58%
Y0%
K5%
CIE LAB
L50
A39
B-70
XYZ (D65)
X25.77
Y18.5
Z85.42
CSS Formats
HEX#6366F1
RGBrgb(99, 102, 241)
HSLhsl(239, 84%, 67%)
HWBhwb(239 11% 33%)
Pantone Matches
Closest
Pantone 2685 C
#9D4EDC
Pantone Cool Gray 11
#53565A
Pantone 2592 C
#B83DBA
Quick Copy
How to use this converter
- Adjust the Red, Green, and Blue sliders, or type values directly into the number fields.
- Read the CMYK card, which shows cyan, magenta, yellow, and key (black) as percentages.
- Use the copy button on the CMYK card to copy the value.
Worked example
For rgb(51, 102, 153), a simple unprofiled conversion gives approximately C 66.67%, M 33.33%, Y 0%, K 40%. The converter rounds these for display tocmyk(67%, 33%, 0%, 40%).
rgb(51, 102, 153)→≈ cmyk(67%, 33%, 0%, 40%)Limitations to know
- CMYK values are estimates from an unprofiled conversion, not guaranteed print matches.
- The final printed color depends on the printer profile, inks, paper, and proofing.
- CMYK has a smaller color range than RGB, so vivid screen colors may print duller.
- Percentages are rounded to whole numbers for display.
Frequently asked questions
How do I convert RGB to CMYK?
Adjust the red, green, and blue sliders (or type values 0 to 255). The CMYK card updates to the estimated cyan, magenta, yellow, and key (black) percentages, which you can copy.
Are the CMYK values exact print matches?
No. The values are estimates from a simple unprofiled mathematical conversion. The final printed result depends on the printer profile, inks, paper, and proofing, so treat the output as a starting point for a proper print workflow.
What is the K channel?
K is key, meaning black. It is the amount of black ink added to deepen the color and improve text and shadow reproduction, separate from the cyan, magenta, and yellow inks.
Why does a bright screen color look duller in CMYK?
CMYK has a smaller color range than the RGB screen space. Vivid RGB colors often cannot be reproduced exactly with CMYK inks, so the converted values describe the closest printable approximation, which can look less saturated.