RPM Calculator

Find engine RPM at any road speed — or reverse it to see what speed you are turning at a given RPM. Built from tire diameter, gear ratio and final drive.

📊 Gear by gear

Change the gear ratio to check cruising RPM in any gear.

🚘 Final drive aware

Includes differential ratio so results match the real driveline.

🎯 Highway planner

See if your RPM sits in the torque band on the interstate.

🔒 Private

No data leaves your browser — all local.

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Gear it right.