Enter the number of teeth in contact and the total number of teeth into the Contact Ratio Calculator. The calculator will evaluate and display the Contact Ratio.

## Contact Ratio Formula

The following formula is used to calculate the Contact Ratio.

CR = TC / T
• Where CR is the Contact Ratio
• #TC is the number of teeth in contact
• #T is the total number of teeth

To calculate the contact ratio, divide the number of teeth in contact by the total number of teeth.

## How to Calculate Contact Ratio?

The following example problems outline how to calculate Contact Ratio.

Example Problem #1:

1. First, determine the number of teeth in contact.
• The number of teeth in contact is given as: 45.
2. Next, determine the total number of teeth.
• The total number of teeth is provided as: 100.
3. Finally, calculate the Contact Ratio using the equation above:

CR = #TC / #T * 100

The values given above are inserted into the equation below and the solution is calculated:

CR = 45 / 100 * 100 = 45.00 (%)

Example Problem #2:

For this problem, the variables required are provided below:

number of teeth in contact = 60

total number of teeth = 750