Tire Diameter Calculator

Tire & MPH For RPM Range

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 Tire Diameter
Tire width - Series - Wheel Diameter
Example 275 - 60 R 15
Tire Width
 Tire Series
 Wheel Diameter


Tire diameter in inches



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