How do I use the colour wheel to match colours?

The colour wheel places colours in a circle, so you can see which ones work together. Colours next to each other blend calmly; colours opposite each other create contrast. Choose a scheme first, then adjust how bright or soft each colour is.

The wheel in brief

The usual wheel has 12 colours:

3 primary: red, yellow, blue.
3 secondary: orange, green, violet (mixes of two primaries).
6 tertiary: mixes in between, like yellow-green or red-orange.

One half of the wheel is warm (reds, oranges, yellows), and the other is cool (greens, blues, violets).

Five schemes that work

Monochrome. One colour in several shades, light to dark. Calm and elegant. Add texture so it doesn't feel flat.

Analogous. Two or three neighbours on the wheel, like green, blue-green and blue. Soft and harmonious, good for bedrooms and living rooms.

Complementary. Two opposites, like blue and orange or green and red. Strong contrast: use one as the main colour and the other as a small accent.

Split complementary. One colour plus the two neighbours of its opposite. Contrast, with less tension.

Triadic. Three colours evenly spaced, like red, yellow and blue. Lively. Use soft versions in homes, or the room gets loud.

Brightness matters more than hue

The same scheme can look calm or loud. Interiors rarely use pure colours: they use softened ones (with white, grey or black added). Terracotta, sage and dusty blue are a gentle triad; red, green and blue are not.

Neutrals

White, beige, grey, black and wood tones don't sit on the wheel but go with everything. They give the eye a rest between colours.

Putting it to work

Choose a scheme.
Pick soft or deep versions to suit the mood.
Split them with the 60-30-10 rule.
Test them in your room's real light.

A 3D render with your colours and your light shows the result before you paint.