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Spur Gear Dimensions Calculating Formulas

There are 2 main types of spur gears, the Imperial (Standard) and the Module which is the Metric type of spur gear.

For the Module Pitch Spur Gear the formulas below will give you the Module Spur Gear Dimensions:

To find the Spur Gear Metric Module: Divide the Pitch diameter (in millimeters) by the number of teeth.

To find the Spur Gear Metric Module: Divide the Circular Pitch (in millimeters) by PI (3.1416)

To find the Spur Gear Metric Module: Divide 25.4 by the Diametral Pitch

To find the Spur Gear Metric Module: Divide the Outside Diameter (in millimeters) by the number of teeth plus 2

To find the Metric Spur Gear Pitch Diameter: Multiply the Metric Module by the Number of Teeth

To find the Metric Spur Gear Pitch Diameter: Multiply the Module by 2 and then subtract it from the Outside Diameter

To find the Metric Spur Gear Outside Diameter: Add 2 to the Number of Teeth and multiply it by the Metric Module

To find the Metric Spur Gear Diametral Pitch: Divide 25.4 by the Module

To find the Metric Spur Gear Circular Pitch: Multiply the Module by PI (3.1416)

To find the Metric Spur Gear Addendum: The Addendum is equal to the Module

To find the Metric Spur Gear Whole Depth: Multiply 2.157 by the Module

To find the Thickness of the Tooth: Multiply the Pitch Diameter (Millimeters) by the Sine of 90° Divided by the Number of Teeth

To find the Metric Spur Gear Metric Module: Divide the Pitch diameter (in millimeters) by the number of teeth.

As you can see, calculating the Spur Gear Dimensions can be a daunting task. Very time consuming and costly. Fortunately there is an inexpensive time saving alternative to manually calculating spur gear dimensions. Spur Gear Calculator™ seen below instantly calculates the spur gear dimensions with just a few inputs needed from you.

Above is the Main Menu in Spur Gear Calculator™. Here you can choose either the Imperial (English) Spur Gear Calculator or the Module (Metric) Spur Gear Calculator. Below is an example of an Imperial Spur Gear Calculation:

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As you can see in the Imperial Spur Gear Calculator example above, Spur Gear Calculator™ calculated the dimensions for Outside Diameter, Pitch Diameter, Whole Depth, Root Diameter, Addendum, Dedendum, Clearance, Circular Tooth Thickness, Circular Pitch and the Basic Circle just by entering 2 variables and choosing the Pressure Angle in the dialog seen below:

Above is the Imperial Spur Gear Calculator Input Dialog. You simply enter the Number of Teeth, the Diametral Pitch Diameter, choose the desired Pressure angle and Spur Gear Calculator™ instantly makes the necessary calculations.

Above is an example of a Module Spur Gear Calculator calculation. Spur Gear Calculator™ calculated the dimensions for Diametral Pitch, Circular Pitch, Outside Diameter, Root Diameter, Pitch Diameter, Circular Tooth Thickness, Addendum, Dedendum and Whole Depth just by entering 2 variables into the dialog seen below:

Above is the Module Spur Gear Calculator Input Dialog. You simply enter the Module and the Number of Teeth and Spur Gear Calculator™ instantly makes the necessary calculations.

This saves you a Substantial Amount of Time and Money! Spur Gear Calculator™ comes with an unconditional, 100% Money Back Guarantee if you are not completely satisfied. So why not order today and start saving time and money calculating spur gear dimensions?