Tire Pressure Adjustment Calculator
Calculate adjusted tire pressure based on temperature changes from the recommended PSI.
Adjusted Tire Pressure
Tire pressure changes with temperature due to gas expansion/contraction:
Pressure Change = Temperature Change (°F) × 1 PSI per 10°F
Adjusted PSI = Recommended PSI + Pressure Change
The rule of thumb:
- Tire pressure changes about 1 PSI for every 10°F (5.5°C) change in temperature
- Pressure increases in warmer weather
- Pressure decreases in colder weather
Example: If recommended pressure is 35 PSI (set at 70°F) and temperature drops to 30°F:
- Change = (30 - 70) / 10 = -4 PSI
- Adjusted pressure = 35 - 4 = 31 PSI (needs air added)
Safety tips:
- Check tire pressure when tires are cold (before driving)
- Never exceed the maximum PSI printed on the tire sidewall
- Under-inflated tires: increased wear, poor fuel economy, risk of blowout
- Over-inflated tires: reduced traction, uneven center wear