Color converter
RGB to CMYK and CMYK to RGB
Type an RGB value or a CMYK value, and the other one appears as you type. Every other notation of the same color is listed below, with each step of the maths.
The converter needs JavaScript. The values shown are for #D3AF37, and the worked examples below read without it.
Result
Inside sRGB
Showing the last color that converted.
- RGB
rgb(211 175 55)- CMYK
cmyk(0% 17.1% 73.9% 17.3%)- HEX
#D3AF37- HSL
hsl(46.2 63.9% 52.2%)- OKLCH
oklch(76.55% 0.13847 91.55)
Color converters
Every format at once
The same color in every notation the converters know. Each name opens its own converter.
| Format | Value | Copy |
|---|---|---|
| Web and CSS | ||
| HEX CSS | #D3AF37 | |
| RGB CSS | rgb(211 175 55) | |
| sRGB (0 to 1) CSS | color(srgb 0.8275 0.6863 0.2157) | |
| Linear sRGB CSS | color(srgb-linear 0.65141 0.42869 0.0382) | |
| HSL CSS | hsl(46.2 63.9% 52.2%) | |
| HSV (HSB) Notation | hsv(46.2 73.9% 82.7%) | |
| HWB CSS | hwb(46.2 21.6% 17.3%) | |
| CSS color name CSS | goldenrodNearest ΔE00 5.00 | |
| Perceptual and CIE | ||
| OKLCH CSS | oklch(76.55% 0.13847 91.55) | |
| OKLab CSS | oklab(76.55% -0.00375 0.13842) | |
| CIELAB CSS | lab(73.19 4.7 62.68) | |
| CIE LCH CSS | lch(73.19 62.86 85.71) | |
| CIE XYZ (D65) CSS | color(xyz-d65 0.42882 0.44786 0.1) | |
| CIE XYZ (D50) CSS | color(xyz-d50 0.45463 0.45457 0.07797) | |
| CIE xyY Notation | xyY(0.43906 0.45855 0.44786) | |
| CIELUV Notation | luv(72.75 30.75 69) | |
| Wide gamut | ||
| Display P3 CSS | color(display-p3 0.80472 0.69157 0.30739) | |
| Rec. 2020 CSS | color(rec2020 0.74174 0.66017 0.25864) | |
| Adobe RGB (1998) CSS | color(a98-rgb 0.78545 0.68035 0.26584) | |
| ProPhoto RGB CSS | color(prophoto-rgb 0.67408 0.63343 0.26964) | |
| Print and paint | ||
| CMYK Notation | cmyk(0% 17.1% 73.9% 17.3%) | |
| RAL Classic Notation | RAL 1032 Broom yellowNearest ΔE00 3.02 | |
| Video | ||
| YCbCr (JPEG, BT.601) Notation | ycbcr(172.08 61.93 155.76) | |
| YCbCr (HD video, BT.709) Notation | ycbcr709(165.43 71.67 148.64) | |
| Code and platforms | ||
| Decimal integer Notation | 13872951 | |
| Android and Flutter ARGB Notation | 0xFFD3AF37 | |
| Android color int Notation | -2904265 | |
| SwiftUI and UIKit Notation | Color(red: 0.8275, green: 0.6863, blue: 0.2157) | |
| GLSL vec3 / vec4 Notation | vec3(0.8275, 0.6863, 0.2157) | |
| Embedded and terminal | ||
| RGB565 Notation | 0xD567Lossy | |
| ANSI 256 (xterm) Notation | 38;5;178Nearest ΔE00 3.11 | |
Every step of the maths
How RGB becomes CMYK
Each step shows the values for the color above, as the converter computes them.
- Start rgb()
rgb(211 175 55) - Back 8-bit channels
the three numbers are the bytes211 175 55 - Back sRGB channels, 0 to 1
each byte ÷ 2550.8275 0.6863 0.2157 - Then CMYK
K = 1 − max; C = (1 − R − K) / (1 − K), and the same for M and Ycmyk(0% 17.1% 73.9% 17.3%)
CMYK
About CMYK
CMYK gives the share of cyan, magenta, yellow and black ink; this page uses the simple formula with no printer profile, in which black is one minus the largest channel. Real printing needs an ICC profile for the paper and press, so these numbers are a starting point, not a proof.
How this page writes it
- Percentages to one decimal place, at which every 8-bit color comes back unchanged.
- Reads cmyk() and device-cmyk(), with percentages or 0 to 1, and plain numbers above 1 as percentages.
Watch for
- Profiled CMYK from print software will differ, sometimes a lot: rich blacks, ink limits and paper white all change the numbers.
Worked examples
RGB to CMYK
Each row is the converter's own output, and a test re-runs every row.
| Color | RGB | CMYK |
|---|---|---|
| White | rgb(255 255 255) | cmyk(0% 0% 0% 0%) |
| Black | rgb(0 0 0) | cmyk(0% 0% 0% 100%) |
| Middle gray | rgb(128 128 128) | cmyk(0% 0% 0% 49.8%) |
| Red | rgb(255 0 0) | cmyk(0% 100% 100% 0%) |
| Green | rgb(0 255 0) | cmyk(100% 0% 100% 0%) |
| Blue | rgb(0 0 255) | cmyk(100% 100% 0% 0%) |
| Royal blue | rgb(37 99 235) | cmyk(84.3% 57.9% 0% 7.8%) |
| Gold | rgb(211 175 55) | cmyk(0% 17.1% 73.9% 17.3%) |
Next
Related converters
Method
Sources and testing
- CSS Color Module Level 4, 5.1: the rgb() and rgba() functions w3.org
- CSS Color Module Level 5: the device-cmyk() function w3.org
- Conversions run in your browser with the site's shared color code; nothing you type is sent anywhere.
- An automated test recomputes every value on this page and reads every format back.
- Checked with a keyboard, the axe engine and Playwright in Chromium, in light and dark themes at phone and desktop widths. It has not yet been checked with a screen reader.
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