Song Key Detector: Which Key Do These Chords Belong To?
Chords from one key tend to cluster together. Counting which key's scale holds the most of your chords points to the likely answer.
What is the Song Key Detector?
A song's chords usually belong to one key more than any other. Paste chords separated by commas and this tool scores each major key by how many of its scale chords appear, and names the best match as a best guess, not a certainty.
How to use it
- Enter your values in the fields provided.
- Click Detect Song Key.
- Read the result and adjust an input if you want a different outcome.
Worked example
Chords C, G, Am, and F match C major on all 4 chords, so C major is the best guess.
What key are the chords C, G, Am, and F in?
All four chords belong to the C major scale, so C major is the best match, with 4 of 4 chords matching.
Frequently asked questions
What do I enter to get a result?
Fill in every field with your own numbers or choices, then run the tool. Empty number fields count as zero, so check them before you trust the output.
Can I reuse this result elsewhere?
Yes. The result is calculated in your browser from the values you entered, so you can copy the numbers into your own notes or plan.