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Gear Finder Calculator

Enter the pinion size (in number of teeth), spur size (in number of teeth), tire size (in decimal inch value, ie for 2 1/2", enter 2.5), and your motor/engine's rated loaded RPM (no commas) and then click "Calculate".  

The Gear Ratio, Inches Per Revolution (IPR), Feet Per Second (FPR) and Miles Per Hour (MPH) will be calculated for you!

Fill Out This Side Only


Pinion Size: Gear Ratio: 
Spur Size: Inches Per Revolution: 
Tire Size: FPS: 
Loaded RPM: MPH: 


Original Concept and Base Code provided by Randall Smith (c), 1999



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This page last modified: 07/26/11