Free PSI tool
Tire Pressure Calculator — Correct PSI & Temperature Adjust
Find your correct tire pressure, adjust for temperature swings, and see how PSI affects safety, wear and fuel economy.
Your Correct Tire Pressure
Door-jamb PSI, corrected for conditions.
What PSI Should My Tires Be?
Use the driver’s door-jamb sticker, not the number on the tire sidewall — the sidewall shows the maximum, not the recommendation. Most cars: 32–35 PSI; trucks/SUVs: 35–40 PSI.
Temperature & Tire Pressure
- Tires gain/lose ~1 PSI per 10°F. A 30°F autumn drop = 3 PSI low.
- Set pressure for the coldest expected morning, not the afternoon.
- Check monthly — tires naturally lose 1–2 PSI per month.
Under vs Over Inflation
- Under-inflated: outer-edge wear, worse MPG, sloppy handling, blowout risk from heat.
- Over-inflated: center wear, harsher ride, less grip on rough roads.
- A few PSI over door-jamb for highway trips is fine; 10+ over is not.
Frequently Asked Questions
What PSI should my tires be?
Check the driver’s door-jamb sticker — typically 32–35 PSI for cars, 35–40 for trucks/SUVs. Never use the sidewall maximum as your target.
How does temperature affect tire pressure?
About 1 PSI per 10°F. Cold mornings in fall/winter are why TPMS lights come on — add air to reach the door-jamb spec cold.
Is it OK to overinflate tires slightly?
2–3 PSI over for highway efficiency is fine. Beyond 5 over, you lose grip and wear the centers prematurely.
How often should I check tire pressure?
Monthly, and before long trips — always cold. Tires lose 1–2 PSI per month naturally.
Why is my TPMS light on?
Usually 25% under-inflation from a temperature drop or slow leak. Inflate to spec; if the light stays on after driving, get the leak checked.
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