Tire Pressure & Temperature Calculator
See how temperature affects your tire pressure and get load-adjusted PSI recommendations.
Section 1 — Temperature Compensation
Section 2 — Load Adjustment
Under-Inflation Impact on MPG & Tire Wear
| Under-Inflated By | Est. MPG Loss | Tire Wear Effect |
|---|---|---|
| 2 PSI | ~0.4% | Slight edge wear |
| 5 PSI | ~1.0% | Noticeable edge wear, heat buildup |
| 10 PSI | ~2.5% | Significant edge wear, handling affected |
| 15 PSI | ~4.0% | Severe wear, risk of blowout |
When to Check Tire Pressure
Always check tire pressure when tires are cold — before driving more than 1 mile. Driving warms the air inside the tire, causing pressure to rise 4–6 PSI above the cold reading. This is normal and does not mean you should let air out of a warm tire.
Where to Find the Correct PSI
The correct inflation pressure is on the sticker inside your driver's door jamb (or sometimes in the glove box or fuel door). Do NOT use the maximum PSI printed on the tire sidewall — that is the absolute maximum the tire can handle, not the recommended operating pressure for your vehicle.
Nitrogen vs. Air
Nitrogen-filled tires retain pressure more consistently because nitrogen molecules are larger and escape more slowly through the tire sidewall. The benefit is modest — roughly 1–2 PSI more stable over temperature swings. It is not worth paying a premium for nitrogen unless your vehicle sits for long periods or you track the car. Topping off with regular air is perfectly acceptable and does not harm nitrogen-filled tires.