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Mechanical / Chain drives
Chain / Sprocket Ratio Calculator
Relate sprocket tooth counts, drive ratio and rotational speed, or solve a target driven sprocket.
Sprocket drive
Chain-drive result
Output speed400 RPM
3:1 driven-to-driver ratio
- Drive ratio
- 3:1
- Output speed
- 400 RPM
- Speed change
- -66.67%
This ideal ratio ignores chain polygonal action, slip, load capacity, centre distance and sprocket availability. Verify minimum tooth count and chain selection against manufacturer data.