Tire Pressure Calculator
Adjusted PSI
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Temperature Adjustment
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Load Adjustment
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Understanding Tire Pressure
Tire pressure changes with temperature: for every 10°F change in ambient temperature, tire pressure changes by approximately 1 PSI. This means your tires can be significantly underinflated in cold weather if you set them during warm months. Checking tire pressure when tires are cold (before driving) gives the most accurate reading.
The recommended tire pressure for your vehicle is listed on the driver's door jamb sticker and in your owner's manual. This is the pressure recommended for normal load conditions. When carrying extra weight (passengers, cargo), you may need to increase pressure, typically about 1 PSI for every 5% increase in load above normal.
Never exceed the maximum pressure listed on the tire sidewall. Properly inflated tires improve fuel economy by 3-4%, extend tire life, and improve handling and safety. Underinflated tires increase rolling resistance, cause uneven wear, and can lead to blowouts.
Frequently Asked Questions
How often should I check tire pressure?
Check tire pressure at least once a month and before long trips. Check when tires are cold, meaning the car has been parked for at least 3 hours or driven less than a mile.
Why do tires lose pressure in cold weather?
Air contracts when cold, reducing pressure. Tires typically lose about 1 PSI for every 10°F drop in temperature. A tire set to 32 PSI in 80°F summer weather could drop to 28 PSI at 40°F.
Should front and rear tires be the same pressure?
Not always. Many vehicles have different recommended pressures for front and rear tires. Check your door jamb sticker for the specific recommendations for your vehicle.
Is it bad to overinflate tires?
Overinflated tires have a smaller contact patch, reducing traction and causing center wear. They also provide a harsher ride and are more susceptible to damage from potholes.