Music Interval Calculator — name & semitones
Find the interval between two notes — its name and semitone count — or get the note a given interval away.
🔒 Runs entirely in your browser. Your input and output are never sent to a server or stored — fully private.
About this tool
The interval calculator names the distance between any two notes — a major third or a perfect fifth, say — and gives its size in semitones, or works the other way to find the note a chosen interval above or below a starting pitch. It is a quick helper for ear training, harmony homework or building chords by hand. Everything is worked out in your browser.
Frequently asked questions
What is a musical interval?
An interval is the pitch distance between two notes, described by a number and a quality — a minor third (three semitones) or a perfect fifth (seven semitones), for example. Intervals are the building blocks of chords, melodies and scales.
How many semitones is a perfect fifth?
A perfect fifth spans seven semitones — C up to G, for instance. The calculator shows the semitone count for any interval, which makes it easy to transpose a part or build a chord with the right spacing.