Gearing Calculator


Ensure all fields are filled in. Enter numbers only in the first 4 boxes. For best results when printing, enable printing of background colours and pictures. In Internet Explorer and Firefox, this is located in File/Page Setup.


Enter the Number of Teeth on the Pinion:

Enter the Number of Teeth on the Spur:

Enter the Internal Drive Ratio:

Enter the Diameter of the Tyres:



Rollout is

Final Drive Ratio is


Enter a Title For Your Chart: