How many notes are there on a standard grand piano?

A standard grand piano has 88 notes because it is designed to cover a wide range of pitches and frequencies. The piano's keys are organized in a repeating pattern of white and black keys, with 52 white keys and 36 black keys. This arrangement allows the player to access seven octaves and three additional notes, providing a comprehensive range of musical possibilities. With 88 notes, the grand piano can faithfully reproduce the melodies, harmonies, and chords required in various musical genres and compositions.