RGB to HEX Color Converter
Convert any red, green and blue color values into a web-ready #RRGGBB hex code and a CSS rgb() string.
#4287F5 · rgb(66, 135, 245)
#4287F5
color mixRed
14.8%
Green
30.3%
Blue
54.9%
How does this calculator work?
To convert RGB to HEX, round and clamp each channel to 0-255, then write each as a two-digit hexadecimal pair and join them after a "#". For example rgb(66, 135, 245) becomes #4287F5. The same channels also form the CSS string rgb(66, 135, 245), describing an identical color.
Formula
How this is calculated
Each color channel — Red, Green and Blue — is an 8-bit value ranging from 0 to 255. Enter the three channel values; any input is rounded to the nearest integer and clamped into the 0..255 range so out-of-range numbers stay valid.
To build the hex code, every channel is converted from decimal to base-16 (hexadecimal). A single byte (0-255) maps to exactly two hex digits, so each value is padded with a leading zero when needed (for example 5 becomes "05"). The three two-digit pairs are concatenated after a leading "#" and uppercased to produce the standard #RRGGBB format used in CSS and design tools.
The CSS rgb() string simply lists the same clamped integer channels as rgb(R, G, B). Both notations describe the identical color: #FFFFFF equals rgb(255, 255, 255) (white) and #000000 equals rgb(0, 0, 0) (black). The donut shows the relative weight of each channel in the mix.
Frequently asked questions
Standard RGB uses 8 bits per channel, giving 256 possible levels (0-255) for red, green and blue. Values below 0 or above 255 are clamped to that range.
A value from 0 to 255 fits in one byte, which is exactly two hexadecimal digits (00 to FF). Smaller numbers are zero-padded so the result is always six digits total.
Yes. They are two notations for the same color. The hex form is compact while rgb() is more readable; both are valid CSS color values.
Also known as
TG we-Calculate Editorial Team. (2026). RGB to HEX Color Converter [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/rgb-to-hex-color-converter
TG we-Calculate Editorial Team. "RGB to HEX Color Converter." TG we-Calculate. 2026. https://we-calculate.com/calculator/rgb-to-hex-color-converter.
TG we-Calculate Editorial Team, "RGB to HEX Color Converter," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/rgb-to-hex-color-converter
@misc{wecalculate_rgb_to_hex_color_converter, title = {RGB to HEX Color Converter}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/rgb-to-hex-color-converter}}, year = {2026}, note = {TG we-Calculate} }
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