🎼 Transposition Calculator
Pick a written note and the keys of your two instruments to see what the second player should read so you both sound the same concert pitch — with any octave shift called out.
🎼 Transpose Between Instruments
What is a Transposition Calculator?
It takes the mental arithmetic out of transposing. Choose the written note, the key of the instrument it's written for, and the key of the instrument you want to play it on, and it works out the note to read so the sounding pitch stays the same for everyone.
Handy when a trumpet player picks up a part written for horn, when you're arranging for a mixed brass section, or when you just want to check a transposition by ear against a tuner. The octave note keeps the result in a range you can actually play.
❓ Frequently Asked Questions
What does a transposition calculator do?
Brass instruments come in different keys — a B♭ trumpet, an F horn, an E♭ tenor horn — and their music is written so a written C sounds as a different concert pitch on each. This tool converts a written note from one instrument's key to another's so both players end up sounding the same concert pitch, and tells you whether the transposed note stays in the same octave.
Why do brass instruments transpose?
It lets a player switch between instruments of the same family — say trumpet and cornet, or the various sizes of horn — using the same fingerings for the same written notes. The music is 'transposed' on the page so the fingering stays consistent even though the instrument's actual pitch differs.
What is concert pitch?
Concert pitch is the actual sounding pitch, the one a piano or tuner reads. A B♭ trumpet playing its written C sounds a concert B♭. Transposing between two instruments really means routing through concert pitch: undo the first instrument's transposition, then apply the second's.
Does the octave shift matter?
Yes — some transpositions push the note past the top or bottom of the twelve-note scale, so the calculator reports an octave shift. In practice you'd move the note up or down that many octaves to keep it in a comfortable, readable range for the instrument.