Tire Pressure Adjustment by Temperature
Tire PSI changes ~1 psi per 10°F. Adjust for outdoor temp delta from setting temp.
Result
Adjusted PSI
34.5 psi
25°F change → +2.5 psi.
- Current PSI32
- Current temp50°F
- Target temp75°F
- Temp change25°F
- PSI change~1 psi per 10°F+2.5 psi
- Predicted PSI34.5
Step-by-step
- Pressure scales with absolute temperature (Gay-Lussac).
- Rule of thumb: 1 psi per 10°F change.
- New PSI = 32 + (75 − 50) / 10 = 34.5.
How to use this calculator
- Enter current PSI + temp.
- Enter target temp.
- Adjust PSI if needed.
About this calculator
Tire pressure obeys Gay-Lussac's law: at constant volume, pressure varies with absolute temperature. Practical rule: ~1 psi per 10°F. Inflating to 32 psi on a 70°F summer day → 28 psi on a 30°F winter morning. Always set pressure to the door-jamb spec at "cold" temperature (sitting overnight in same temp as ambient). Driving heats tires +10-15°F → +1-2 psi. Severely under-inflated tires (>5 psi low) wear faster, run hotter, and waste fuel.
Frequently asked
Cold (parked overnight) at start of a temp-change season — fall and spring. Set to door-jamb spec.
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