RGB to HEX Converter Online

Common RGB to HEX Conversion Table

Use this quick reference table to look up the HEX code for common colors. Each RGB value (Red, Green, Blue) maps to a 6-digit hexadecimal code you can paste straight into your HTML or CSS. Most design tools and color pickers display these HEX codes alongside their RGB values.

The Math: How to Manually Convert RGB to HEX

Each RGB channel is a decimal (base 10) number from 0 to 255, and each one becomes a two-character hexadecimal (base 16) value. To convert a single channel by hand, divide the value by 16. The quotient becomes the first hex digit and the remainder becomes the second, using the mapping 10=A, 11=B, 12=C, 13=D, 14=E, and 15=F.

Here is how the red channel value 255 converts to FF:

Do this for all three channels and join the results. For example, rgb(255, 165, 0) becomes FF, A5, and 00 (since 165 ÷ 16 = 10 remainder 5, and 10=A, 5=5), giving the HEX code #FFA500 (orange).

Understanding 3-Digit and 8-Digit Hex Codes

A hex color code is not always six digits. Depending on the format, it can be 3, 6, or 8 characters long:

• 6-digit hex: The standard form, written as #RRGGBB. Each pair of characters sets the Red, Green, and Blue channels, for example #FF0000 for pure red.
• 3-digit shorthand hex: When each channel uses a repeated pair, the code can be shortened. #F00 expands to #FF0000, and #0AF expands to #00AAFF. Shorthand only works when both characters in every pair are the same.
• 8-digit hex (RGBA): Written as #RRGGBBAA, this adds a fourth value, the alpha channel, which controls transparency. FF is fully opaque and 00 is fully transparent, so #FF000080 is red at about 50% opacity.

This is why a value like 255 255 255 255 has four numbers instead of three, it is an RGBA color. The first three values are white (255, 255, 255) and the last value, 255, is the alpha channel set to fully opaque, which is written as #FFFFFFFF in 8-digit hex.