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Calculators appear courtesy of Mark Williams Enterprises

Gear Ratio and RPM Calculator
Instructions: Use this calculator to estimate various aspects of your performance. The defaults show suggested values. If you would like to find a value other than speed, fill in information for all the boxes and clear the value in box you would like an answer for. For example if you want to calculate RPM at a known speed, clear the RPM box or set it to 0.
Description: English Input:   Metric Input:
Tire Diameter: Inches MM 
Wheel Rollout:  Inches  MM 
Engine RPM: RPM  
Final Drive Ratio:  
Gear Ratio:  
Torque Converter Slip (%) %  
Speed:   MPH   KPH

Tire Size Calculator
Instructions: Enter the tire information found on the sidewall of your tire. For example a tire that is marked 205/65 R16 has a tread width of 205, a profile of 65, and a wheel size of 16". This will give an approximation of your tire diameter and rollout. Due to variations in tire construction and wheel widths this is not an exact number.
Enter Tread Width: Calculated Diameter (in) IN
Enter Profile: Calculated Diameter (mm) MM
Enter Wheel Diameter: (IN) Calculated Width (in) IN
Enter Wheel Diameter: (MM) Calculated Rollout (in) IN
    Calculated Rollout (mm) MM
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