Unlock musical flexibility with our free Chord Transposer. Instantly transpose any chord to a new key, simplifying song adaptation for guitar, piano, or any instrument. Ideal for musicians, arrangers, and students looking to change song keys with ease.
Formula:
The Chord Transposer works by calculating the musical interval (number of semitones) between your Original Key and your Target Key.
This interval is then applied to the root note of your Original Chord. The chord's quality (e.g., Major, minor, 7th, sus4) remains the same.
- Original Key Index (OKI)
- Target Key Index (TKI)
- Original Chord Root Index (OCRI)
- Transposition Interval (TI) = TKI - OKI
- New Chord Root Index (NCRI) = (OCRI + TI + 12) % 12
- New Chord = Note at NCRI + Original Chord Quality
For example, to transpose Cmaj from Key of C to Key of G:
- OKI (C) = 0
- TKI (G) = 7
- OCRI (C) = 0
- TI = 7 - 0 = 7 semitones
- NCRI = (0 + 7 + 12) % 12 = 7 (which is G)
- New Chord = Gmaj