RPM Calculator

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Calculates the engine RPM based on vehicle speed, gear ratio, final drive ratio, and tire size.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Vehicle Speed, Gear Ratio, Final Drive Ratio, and Tire Diameter in the units shown.

Step 2

Read Wheel RPM and Engine RPM in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

See the inputs and their calculated results.

Vehicle Speed: 60 mph; Gear Ratio: 3.5; Final Drive Ratio: 3.73; Tire Diameter: 26 inches

Wheel RPM: 775.6984615 RPM; Engine RPM: 10,126.74342 RPM

Vehicle Speed: 70 mph; Gear Ratio: 3; Final Drive Ratio: 3.55; Tire Diameter: 25 inches

Wheel RPM: 941.1808 RPM; Engine RPM: 10,023.57552 RPM

Vehicle Speed: 50 mph; Gear Ratio: 4.1; Final Drive Ratio: 4.1; Tire Diameter: 28 inches

Wheel RPM: 600.2428571 RPM; Engine RPM: 10,090.08243 RPM

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