Enter the tire sidewall height (in) and the tire width (in) into the Tire Aspect Ratio Calculator. The calculator will evaluate and display the Tire Aspect Ratio.

## Tire Aspect Ratio Formula

The following formula is used to calculate the Tire Aspect Ratio.

TAR = SH / W

• Where TAR is the Tire Aspect Ratio (height:width)
• SH is the tire sidewall height (in)
• W is the tire width (in)

## How to Calculate Tire Aspect Ratio?

The following example problems outline how to calculate Tire Aspect Ratio.

Example Problem #1:

1. First, determine the tire sidewall height (in).
• The tire sidewall height (in) is given as: 12.
2. Next, determine the tire width (in).
• The tire width (in) is provided as: 15.
3. Finally, calculate the Tire Aspect Ratio using the equation above:

TAR = SH / W

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

TAR = 12 / 15  = .8 (height:width)

Example Problem #2:

For this problem, the variables required are provided below:

tire sidewall height (in) = 13

tire width (in) = 16

Test your knowledge using the equation and check your answer with the calculator above.

TAR = SH / W  = ?