Song Key Detector
Guess the most likely major key from a list of chords.
Quick answer: enter your details below and click Detect Song Key — your result appears instantly, right here in your browser. Nothing you enter is uploaded or stored.
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How to use
- Enter your values in the fields provided.
- Click Detect Song Key.
- Read the result and adjust an input if you want a different outcome.
About this tool
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.
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.