Music Transposer
Transpose musical notes by any interval or from one key to another. Free online music transposition calculator with pitch shift chart and note distribution.
About This Calculator
The Music Transposer lets you transpose musical notes and chords by any interval or from one key to another. Singers, instrumentalists, songwriters, and music students use it to quickly find the correct pitches after a key change, accommodate different vocal ranges, or transpose sheet music for transposing instruments.
In music, transposition means shifting every note in a passage by the same interval — the relative distances between notes stay the same, so melodies and chord shapes remain intact, just at a higher or lower pitch. The calculator supports two methods: transpose by interval where you specify the exact number of semitones (0–12, covering the complete octave) and direction (up or down), and transpose by key where you select the original key and the target key and the calculator computes the interval automatically. You can enter up to 6 notes at once to transpose whole chords or short melodic phrases.
The transposition uses the twelve-tone equal temperament scale where each semitone is exactly the 12th root of 2 apart — the standard tuning system for virtually all Western music since the 18th century. The pitch shift bar chart shows the original and transposed note positions (0 = C, 11 = B) so you can visualise the interval shift, and the distribution doughnut chart shows the pitch-class spread of the transposed notes.
Common Transposition Examples
- Capo transposition: Placing a capo on fret 2 of a guitar raises the pitch by a major second (2 semitones). A C chord shape produces a D sound.
- Transposing instruments: A B-flat trumpet sounds a major second lower than written. To write for B-flat trumpet at concert pitch, transpose the part up a major second.
- Vocal key change: If a song in C is too high for a singer, transpose it down to A (3 semitones down, a minor third) to lower the range.
Frequently Asked Questions
How does the Music Transposer work?
Select a transpose method — by interval (semitone count) or by key (from one key to another). Choose the interval or source/target key pair, select up to 6 notes from the chromatic scale, and click Transpose. The calculator shifts every note by the specified interval and displays the transposed result with a pitch shift chart.
What does transpose mean in music?
To transpose in music means to change the key of a note, chord, or entire piece by moving every note up or down by a consistent interval. This preserves the relative intervals between the notes while shifting the overall pitch level. Transposition is commonly used to accommodate different vocal ranges or instrument tunings.
How many semitones are in common intervals?
Common intervals in semitones: perfect unison (0), minor second (1), major second (2), minor third (3), major third (4), perfect fourth (5), tritone (6), perfect fifth (7), minor sixth (8), major sixth (9), minor seventh (10), major seventh (11), perfect octave (12). A semitone is the smallest interval in Western twelve-tone equal temperament, equal to one fret on a guitar or one key on a piano.
How do I transpose a song from one key to another?
To transpose a song from one key to another, first determine the interval between the original key and the target key. For example, transposing from C major to G major is a perfect fifth (7 semitones) up. Then move every note in the melody and every chord by that same interval. This tool automates this process — simply enter your notes and select the transpose settings.
What is the difference between transposing by interval and transposing by key?
Transposing by interval (semitones) lets you specify the exact number of semitones up or down to shift each note, giving you fine control over the transposition. Transposing by key lets you select the original key and the target key — the calculator automatically computes the interval between them. The key method is more intuitive when you want to match a specific key signature.
Can I transpose chords with this calculator?
Yes, you can transpose up to 6 notes at once, which covers most chord voicings. Simply enter the root notes of your chord (e.g., C, E, G for a C major chord) and select the desired interval or key change. Each note will be transposed individually by the same interval, preserving the chord quality (major, minor, diminished, etc.) at the new pitch level.
Is this music transposer free?
Yes, this music transposition calculator is completely free to use with no registration or hidden charges. You can bookmark or share your calculation via URL — the browser link saves all your note selections and transpose settings for easy reference.