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These calculators will help you figure out your Tire Diameter & MPH For RPM Range. Fill in the fields below and click the "Calculate" button. JavaScript must be enabled in your browser for the calculation to work.

Calculate mph for RPM range
Tire diameter		Gear Ratio
This calculation assumes the car's transmission is in drive or 1:1 ratio, no overdrive. For Overdrive cars mutliply the overdrive ratio times the rear and gear ratio. Example a 700R4 transmission has an overdive ratio 0.7:1. For a 4.11 rear end multiply 4.11 x 0.7 = 2.877. Enter 2.877 as the number for the gear ratio to calculate speeds in overdive. JavaScript must be enabled in your browser for the calculation to work.
1000 rpm	mph	4500 rpm	mph
1500 rpm	mph	5000 rpm	mph
2000 rpm	mph	5500 rpm	mph
2500 rpm	mph	6000 rpm	mph
3000 rpm	mph	6500 rpm	mph
3500 rpm	mph	7000 rpm	mph
4000 rpm	mph	7500 rpm	mph