Harmonic Frequency (Hz)
1 277.2
2 554.4
3 831.6
4 1108.8
5 1386
6 1663.2
7 1940.4
8 2217.6
9 2494.8
10 2772
The frequencies of the notes on the trumpet can be calculated by multiplying the fundamental frequency by the appropriate harmonic number. For example, the frequency of the note C4 on the trumpet in B♭ is 277.2 Hz × 2 = 554.4 Hz.
The trumpet can also produce higher frequencies by using different fingering techniques. These techniques include overblowing, lip slurs, and pedal tones. Overblowing is a technique that produces a higher note than the one that would normally be produced by a given fingering. Lip slurs are a technique that produces a smooth transition between two notes. Pedal tones are a technique that produces a low note that is below the fundamental frequency of the trumpet.