Convert on-screen RGB colors into the CMYK percentages used by printers. Screens add light with red, green and blue, but ink works the opposite way, subtracting light with cyan, magenta, yellow and a key black channel, so any color destined for print has to cross that gap. This tool applies the standard RGB to CMYK formula to give you a quick, math-based estimate of the four ink percentages, which is perfect for mockups, spec sheets and getting a feel for how a color splits into inks. Remember that exact print output also depends on paper and color profiles, so treat these numbers as a solid starting point. Everything is calculated locally in your browser.