Note Calculator

A calculator for tone pitch, keys and intervals. The calculator produces equal scaled pure tones (sine waves) of one second length each, or any other duration and equal volume. But the human ear hears low tones much worse than high tones. So if you don't hear a low tone, first try a high one, before turning up your loudspeakers.

If you played a note, it will be marked by a red square and names and frequency of it will be displayed. If you choose a key (left column), the according notes will be marked blue on the upper keyboard, if you choose an interval (right column), they will be marked green. To form an interval, first play a tone to start it, then press an interval button. Play different notes on the upper and lower keyboard to show the ratio of their frequencies. Tuning determines the frequency of the standard pitch A4. The common value is 440 hertz. This value can be changed for each of the two keyboards individually.

Tone length: s | Sound on Sound off | Tuning keyboard A: Hz, Tuning keyboard B: Hz

In the music of the western culture, a tonal range from one frequency up to twice its frequency is divided into seven tones. The next eighth note is given the same name as the first with different markings, such as dashes. This division into seven tones is called heptatonic; from one note to the next of the same name, it is an interval of eight tones, an octave, from the Latin name for eight. It often begins with the note c, then continues with d, e, f, g, a, b, and c again. These are the root tones. Identical notes in different octaves have a pitch ratio of 2:1 or 4:1, and so on; apart from their pitch, they sound similar. Intervals with fewer than eight tones are given other numerical names, such as the fifth for five, although here there are more than eight different intervals, as semitones are also taken into account.