Convert RGB to HSB (or HSB to RGB) instantly — enter values, sliders, or a hex code and get accurate hue, saturation, and brightness output with no signup required.
How the RGB to HSB Conversion Works
HSB (Hue, Saturation, Brightness) — also called HSV — describes a color using three values instead of RGB’s red, green, and blue channels: Hue (0–360°) is the color’s position on the color wheel, Saturation (0–100%) is color intensity, and Brightness (0–100%) is how light or dark the color appears.
The conversion works in three steps:
- Normalize RGB — divide each of R, G, B by 255 so all three fall between 0 and 1.
- Find Brightness and Saturation — Brightness (B) equals the maximum of the three normalized values. Saturation (S) equals
(max − min) / max, or 0 if max is 0 (pure black). - Calculate Hue — Hue depends on which channel (R, G, or B) is the maximum, using the difference between the other two channels to determine where on the 360° wheel the color falls.
Example: RGB(59, 130, 246) — a mid-tone blue — normalizes to roughly (0.23, 0.51, 0.96). Brightness is 96% (the max value), Saturation is about 76%, and Hue works out to 217°, giving hsb(217, 76%, 96%).
The reverse conversion (HSB to RGB) runs the same logic backward: it uses Hue to determine which color sector the value falls in, then applies Saturation and Brightness to calculate the proportional R, G, and B channel values.
HSB vs RGB — What’s the Difference?
RGB and HSB describe the exact same colors — they’re just different ways of measuring them, and neither one is “better,” only better suited to different tasks.
RGB defines color by how much red, green, and blue light combine, which maps directly to how screens render pixels — this is why RGB (and its CSS relatives, HSL and hex) is the format used in stylesheets. HSB defines color the way a person intuitively thinks about it: what color is it (Hue), how vivid or muted is it (Saturation), and how light or dark is it (Brightness) — which is why design tools like Photoshop, Illustrator, and Affinity use HSB-style sliders for color pickers instead of raw RGB values.
In practice: designers pick and adjust colors in HSB because dialing in “a slightly darker, less saturated version of this blue” is intuitive with Brightness and Saturation sliders — then that color gets converted to RGB or hex for use in code, since browsers and CSS don’t natively support HSB.
When You’ll Need This Conversion
- Design handoff to development — a designer picks a shade in Photoshop’s HSB picker and needs the RGB or hex equivalent to hand off for CSS/theme styling.
- Matching a brand color across tools — brand guidelines are sometimes documented in HSB; converting to RGB/hex makes the color usable in a WordPress theme customizer or page builder.
- Programmatic color adjustments — developers building color pickers, theme customizers, or design tools often need to convert between the two formats to expose intuitive HSB controls while storing colors as RGB/hex under the hood.
FAQ
What is the HSB color model?
HSB stands for Hue, Saturation, and Brightness — a way of representing color using three values: Hue (0–360°) for the base color, Saturation (0–100%) for intensity, and Brightness (0–100%) for lightness or darkness, rather than RGB’s red/green/blue channel mix.
Is HSB the same as HSV?
Yes — HSB and HSV are the same color model with two different names for the same third value; “Brightness” and “Value” refer to identical measurements, so any RGB-to-HSB formula is also an RGB-to-HSV formula.
How do I convert RGB to HSB manually?
Normalize each RGB channel to a 0–1 range, set Brightness to the highest of the three normalized values, calculate Saturation as the difference between the highest and lowest values divided by the highest value, then derive Hue from which channel is dominant and the relative difference between the other two.
Is HSB the same as HSL?
No — HSB and HSL share the same Hue calculation but differ in the other two values: HSB’s Brightness measures pure lightness of the color at full saturation, while HSL’s Lightness is centered around a 50% midpoint, which is why the same color can report different Saturation and Lightness/Brightness numbers between the two models.
Where is HSB used in web design?
HSB is used almost exclusively in design software color pickers (Photoshop, Illustrator, Figma’s HSB mode) for intuitive color selection — CSS itself doesn’t support an hsb() function, so colors selected in HSB are converted to RGB, hex, or HSL before being used in a stylesheet or WordPress theme.