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Key Transposition Calculator

Transpose musical keys up or down by any number of semitones. Useful for changing song keys, capo calculations, and instrument transposition.

Transposition Result

Original Key:
G Major
New Key:
C Major
Interval:
Perfect 4th up
Capo Position (guitar):
Capo 5 (play G shapes)
Pitch Shift:
+5 semitones

Key Transposition Calculator

Enter a key and semitone shift get your new key, interval name, capo position, and a full transposition chart instantly. You can also calculate pitch shift from BPM for tempo-based key changes.

G Major +5 → C Major
D Major −2 → C Major
A Minor +7 → E Minor
1

Pick your key

Choose any of the 12 chromatic notes and select Major or Minor.

2

Set semitones

Type a number or tap a quick-button (+5, +7, −2…). Positive = up, negative = down.

3

Read the result

New key, interval name, capo position, and full chart appear instantly.

↑ Try the calculator above

How to Use the Key Transposition Calculator

  • Select your original key Choose from C, C♯, D… through B. Enharmonic pairs (e.g. C♯/D♭) are shown together.
  • Choose Major or Minor This controls how the result is labeled and which scale the chart references.
  • Enter semitones (−12 to +12) Positive numbers transpose up; negative numbers transpose down. Use the quick-buttons for common intervals.
  • Read your outputs The result panel updates immediately — new key, interval name, capo fret, and pitch shift all shown at once.
  • Check the full chart Scroll down in the result panel to see every chromatic note transposed by the same interval — useful for transposing entire chord progressions.
Tip: Use the +5 (4th up) or +7 (5th up) quick-buttons for the most common key change moves in pop and jazz.

What Does the Calculator Show?

Output 1
New Key

The key that results from your transposition. Shown with full name (e.g. "C Major"). This is the key you'll perform, arrange, or mix in after the shift.

Output 2
Interval Name

The music-theory name for your semitone distance — e.g. "Perfect 4th up" for +5 semitones. Useful for communicating key changes with other musicians.

Output 3
Capo Position

If you're a guitarist, this shows which fret to place the capo so you can play familiar open-chord shapes in the new key. Example: Capo 5, play G shapes → sounds in C.

Output 4
Transposition Chart

A complete table showing all 12 chromatic notes transposed by your chosen semitone value. Use it to transpose every chord in a song at once.

Quick Semitone Reference

All key transpositions are based on semitone distance — the number of half-steps between two notes on the chromatic scale.

Semitones Interval Name Common Use Example (from G)
1 Minor 2nd Subtle key nudge G → G♯
2 Major 2nd Singer range tweak G → A
3 Minor 3rd Relative key shift G → A♯
4 Major 3rd Common modulation G → B
5 Perfect 4th Capo 5 / DJ pitch match G → C
6 Tritone Maximum contrast G → C♯
7 Perfect 5th Circle of fifths move G → D
8 Minor 6th Modal transposition G → D♯
9 Major 6th Brass transposition G → E
10 Minor 7th Blues/jazz key work G → F
11 Major 7th Rare, tight key change G → F♯
12 Octave Same key, higher octave G → G
How many semitones in an octave? 12. That's why transposing by +12 or −12 returns you to the same key, just one octave higher or lower.

When Would You Use a Key Transposition Calculator?

🎤

Singers — Matching Vocal Range

Song too high? Transpose down 2–3 semitones. Too low? Shift up. Enter your song's original key, set the semitone shift, and immediately see the new key to share with your accompanist.

🎸

Guitar — Capo Placement

Want to play in C Major using open G shapes? Transpose G → C (+5 semitones). The calculator tells you: Capo 5. No theory needed — just pick up and play.

🎹

Piano — Easier Key Signatures

A♭ Major (4 flats) too complex? Transpose down 1 semitone to G Major (1 sharp). Same piece, much easier to read and play. Use the transpose key calculator to find the simplest equivalent key.

🎧

DJs & Producers — Key Matching

Need two tracks to blend harmonically? Find the semitone difference between their keys and pitch-shift one track by that amount. Use the semitone calculator to get the exact number before touching your DAW.

How to Transpose a Key Manually

No tool nearby? Here's the fastest manual method:

  • Count semitones between keys Write out the 12 chromatic notes (C, C♯, D, D♯, E, F, F♯, G, G♯, A, A♯, B) and count the steps from your start key to your target key.
  • Apply that number to every chord root If the distance is +5, move every chord root up 5 semitones. Am → Dm, G → C, Em → Am, and so on.
  • Keep the chord quality the same Major stays major, minor stays minor, dominant 7th stays dominant 7th. Only the root pitch changes.
  • Check accidentals against the new key signature C♯ and D♭ are the same pitch — use whichever spelling the new key signature calls for. The calculator handles this automatically.
All Keys Transposition Chart
Original +5 semitones

FAQ

Yes — always. Transposing by any non-zero number of semitones results in a new key with a different set of pitches and a different key signature. The melody and chord relationships stay the same; only the pitch level and key name change.

Key transposition means shifting all the notes in a piece of music up or down by the same interval. The result is musically identical content in a new key. It's used to match a singer's range, suit an instrument, or align tracks in a mix.

There are 12 semitones in one octave. This is why the calculator range goes from −12 to +12 — transposing by ±12 returns you to the same key name, just one octave higher or lower in pitch.

Use a capo — each fret raises pitch by 1 semitone. To transpose up 5 semitones, place the capo on fret 5 and play your normal open chord shapes. The calculator shows exactly which capo fret corresponds to your chosen semitone shift.

A perfect fifth is 7 semitones. It's one of the most common transposition intervals in music — moving one step clockwise on the circle of fifths. Example: C to G is a perfect fifth (+7 semitones).

Yes. Enter your original key and semitone shift, then use the transposition chart at the bottom of the result panel. Every row shows a source note alongside its transposed equivalent — map your chord roots through the chart to transpose the full progression.

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