How Hex Color Codes Work: A 5-Minute Explainer for Non-Designers
#FF5733 looks like random characters but it is actually a recipe: how much red, how much green, how much blue. Once you see the pattern, you can read any color code.
Every color on your screen is made by mixing three colors of light: red, green, and blue. Each color channel ranges from 0 (none) to 255 (maximum). Pure red is 255 red, 0 green, 0 blue. Pure white is all three at 255. Pure black is all three at 0. Every other color is a specific mix of these three values.
What the Hex Code Means
A hex code like #FF5733 is just a compact way to write three numbers. Split it into pairs: FF, 57, 33. Each pair is a number in hexadecimal (base-16): FF = 255 in decimal, 57 = 87, 33 = 51. So #FF5733 means: 255 red, 87 green, 51 blue. Since red is maxed out and the others are low, this is a vivid orange-red.
Hexadecimal counts from 0-9 then A-F, where A=10, B=11, C=12, D=13, E=14, F=15. The highest two-digit hex number is FF = 15×16 + 15 = 255. The lowest is 00 = 0. This is why hex codes always have exactly 6 characters — two digits for each of three color channels.
Patterns That Let You Read Colors Instantly
#FF0000 is pure red (max red, no green, no blue). #00FF00 is pure green. #0000FF is pure blue. #FFFF00 is yellow (red + green, no blue). #FF00FF is magenta (red + blue, no green). #00FFFF is cyan (green + blue, no red). #FFFFFF is white (everything maxed). #000000 is black (everything off). #808080 is medium gray (all three channels at half).
Once you know these, you can estimate any hex code: #3B5BDB has low red (3B ≈ 59), medium green (5B ≈ 91), and high blue (DB ≈ 219) — it is a blue, specifically the blue CalcWolf uses. #2ECC71 has low red, high green, medium blue — it is the green used for success messages.
Explore hex codes interactively with our color picker — slide RGB values and see the hex code update in real time, or paste any hex code and see the color with its RGB and HSL equivalents.