Enter the current tire pressure and the change in temperature into the calculator to determine the new tire pressure.

## Tire Pressure Temperature Formula

The following formula is used to calculate the change in tire pressure with a change in temperature.

TP = OTP +/-   OTP * (TC/10) * .02
• Where TP is the new tire pressure (PSI)
• OTP is the original tire pressure (PSI)
• TC is the change in temperature (F)

To calculate the change in tire pressure due to temperature. multiply the original tire pressure by the change in temperature then multiply by .002. This is the change in pressure. Then add or subtract from the original pressure to find the new pressure.

## Does tire pressure change with temperature?

Yes, tire pressure does change with temperature. Since tires are filled with air, and air follows the laws of thermodynamics, the air pressure must change when the temperature of the air changes. These laws are known as the ideal gas laws.

As temperature increases, pressure will also increase. Conversely, as temperature decreases, tire pressure will also decrease.

## How to calculate tire pressure change with temperature?

Example Problem:

The following example outlines how to calculate a change in tire pressure with a change in temperature.

First, determine the original tire pressure. For this example, the original tire pressure is 32 psi.

Next, determine the change in temperature. In this case, the temperature dropped 30 degrees overnight.

Finally, calculate the change in tire pressure and new tire pressure using the formula above:

TP = OTP +/- OTP * (TC/10) * .02

TP = 32 +/- 32 * (30/10) * .02

TP = 32 +/- 1.92 = 30.08 PSI

In this example, you subtract the change in tire pressure from the original tire pressure because the temperature dropped.