Correct tire pressure affects more than just ride comfort — under-inflated tires wear out faster and reduce fuel economy, while over-inflated tires reduce traction and increase the risk of a blowout. This car tire pressure calculator helps you find the recommended PSI for your specific vehicle and load, since the ideal pressure differs between a lightly loaded car and one carrying passengers or cargo. Checking pressure monthly, ideally when tires are cold, gives the most accurate reading.
Tire Pressure Suite
Ensure maximum safety and tire life. Choose the tool you need below.
Use this when installing a different tire size than factory. It calculates the exact PSI needed to maintain your vehicle’s structural load capacity.
1. Original Specs (Door Jamb Sticker)
e.g. “91” in 205/55R16 91V
2. New Tire Specs (Sidewall)
Air contracts when cold. If you fill tires in a warm garage, they will lose pressure outside. Use this to calculate the exact pressure to fill them to *right now* to prevent winter TPMS warnings.
Temperature of your garage/current location.
The coldest average temperature outside.
Awaiting Specs
Enter your parameters above to calculate the safest exact tire pressure.
Recommended New Pressure
Maintains Original Load Capacity
OEM Capacity
0 lbs
New Capacity
0 lbs
Undersized Tire Warning
These tires have a lower max capacity than factory. Running at max pressure is required, but it technically reduces vehicle GVWR.
Current Fill Target
Fill to this pressure right now.
How it works:
You are filling tires in a °F location. When you drive outside into °F weather, the air will contract. Filling to the number above ensures your tires will drop perfectly to your target of PSI when cold.
Disclaimer: Always check tire sidewall to ensure you never exceed maximum rated pressure.
Tire pressure and tire size go hand in hand when it comes to overall tire maintenance and cost — if you’re not sure what size your vehicle takes, our car tire size calculator can help. Keeping tires properly maintained also reduces your long-term costs, which you can factor into your car maintenance cost calculator estimate alongside other routine upkeep.