There are seven classic colors in the rainbow: red, orange, yellow, green, blue, indigo, and violet.

Quick Scoop: Is it always seven?

Most schoolbooks and kids’ posters say a rainbow has seven colors, remembered by the acronym ROYGBIV (Red, Orange, Yellow, Green, Blue, Indigo, Violet). This convention traces back to Isaac Newton, who deliberately divided the spectrum into seven parts to match ideas about harmony and music notes.

In practice, the light in a rainbow is a continuous spectrum, so there are infinitely many shades blending into one another, not hard “bands.” That’s why some modern explanations and designs (like some rainbow flags) effectively treat it as six main colors and drop indigo altogether.

So, for everyday answers and homework: 7 colors in the rainbow. For physics nerds: it’s really a smooth spread of countless colors within that band of light.

Information gathered from public forums or data available on the internet and portrayed here.