RGB to HEX Converter

How do you convert RGB to HEX?

Convert each of the three values (0 to 255) to a two-digit base-16 number and write them one after another behind a #. Divide the value by 16: the whole number is the first digit and the remainder is the second, with 10 to 15 written as A to F. Values below 16 get a leading zero.

Example: rgb(46, 139, 87)

So rgb(46, 139, 87) = #2E8B57, which happens to be the CSS color seagreen.

What is the RGB to HEX formula?

first digit = floor(value ÷ 16)
second digit = value mod 16
HEX = # + RR + GG + BB

How do you convert RGBA to HEX?

Multiply the alpha (0 to 1) by 255, round it, and add it as a fourth pair. rgba(46, 139, 87, 0.5) becomes #2E8B5780 because 0.5 × 255 = 127.5, rounded to 128 = 80 in hex. Paste an rgba() value above to see it.

How do I convert RGB to HEX in JavaScript or Python?

// JavaScript
const toHex = (r, g, b) => "#" + [r, g, b].map(v => v.toString(16).padStart(2, "0")).join("").toUpperCase();
toHex(46, 139, 87); // "#2E8B57"

# Python
"#{:02X}{:02X}{:02X}".format(46, 139, 87)  # '#2E8B57'

Is HEX the same as RGB?

Yes, for web colors they describe the same sRGB values in different notation. #2E8B57 and rgb(46, 139, 87) render identically; hex is shorter, rgb() is easier to read and edit. Both are defined in W3C, CSS Color Module Level 4.

Common RGB values in HEX

Color Code Converter · HEX to RGB Converter · CMYK to RGB Converter · RGB to CMYK Converter

Formulas checked October 2026 against W3C, CSS Color Module Level 4.