Gear Ratio Calculator

Calculates or estimates gear ratio for engineering use.

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Result

Gear ratio

3:1

Output RPM (if driver RPM known)

500 RPM

Gear Ratio Calculator — How It Works

Calculates or estimates gear ratio for engineering use. Try the Gear Ratio Calculator in your browser — instant results, no sign-up.

Enter your values in the fields shown. Results update live as you type.

Yes — runs entirely in your browser.