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TireMath is an intuitive, easy-to-use application that provides answers to several different tire equations. What size tire is 33x12.5x15 in Metric? I got bigger tires, now is my speedometer off? What size gear ratio do I need after upgrading my tires? All these questions can be answered with this tool. TireMath includes the following calculations:

Metric to Standard Tire Conversion
Standard to Metric Tire Conversion
Speedometer Conversion based on Tire Size
Odometer Conversion based on Tire Size
Needed Gear Ratio based on Tire Size