# How To Calculate Gear Pitch

The diametral pitch of a gear describes how densely its teeth are set around it. The pitch is the ratio between the number of teeth and the gear's size, and engineers always express it as a whole number. This value is important for further calculations involving the gear, including the size of each of the gear's teeth. A smaller pitch corresponds with larger teeth, and smaller teeth belong on a gear with a larger pitch.

### Step 1

Measure the radius of the gear. Exclude the gear's teeth from your measurement. For this example, imagine a gear with a radius of 3 inches.

### Step 2

Multiply this measurement by 2: 3 × 2 = 6 inches.

### Step 3

Divide the number of teeth on the gear by this measurement. For example, if the gear has 28 teeth: 28 / 6 = 4.67.

### Step 4

Round this figure to the nearest whole number: 4.67 is approximately 5, so the gear has a pitch of 5.

### TL;DR (Too Long; Didn't Read)

"Pitch" sometimes instead refers to the circular pitch, which is the distance between corresponding points on successive teeth. To find this value, divide pi by the diametral pitch. With this example: 3.142 / 5 = 0.628 inches.

### Cite This Article

#### MLA

Menezes, Ryan. "How To Calculate Gear Pitch" *sciencing.com*, https://www.sciencing.com/how-8662572-calculate-gear-pitch/. 7 August 2017.

#### APA

Menezes, Ryan. (2017, August 7). How To Calculate Gear Pitch. *sciencing.com*. Retrieved from https://www.sciencing.com/how-8662572-calculate-gear-pitch/

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Menezes, Ryan. How To Calculate Gear Pitch last modified March 24, 2022. https://www.sciencing.com/how-8662572-calculate-gear-pitch/