Tire pressure falls roughly one psi for every ten degrees the temperature drops, which is why the warning light appears on the first cold morning. Enter your placard pressure and temperature to see where you actually are and what to reset it to.
Tyre Pressure Seasonal Adjustment Calculator — Stay in the Right Range All Year
Tyre pressure drops 1 PSI per 10°F of temperature change. If you set your tyres in summer and haven’t checked since, they’re probably underinflated.
Enter your baseline tyre pressure, current temperature, and target temperature. The calculator returns the corrected pressure and flags under/over-inflation.
Underinflated tyres reduce fuel economy, increase tyre wear, and increase blowout risk. NHTSA links tyre pressure directly to crash risk, particularly on motorways.
All drivers — especially useful for seasonal tyre swaps and anyone in a variable-temperature climate.
- NHTSA FMVSS 138 tyre pressure monitoring standards
- Manufacturer tyre placard requirements
- Seasonal pressure adjustment data
Disclaimer: This tool is provided for educational and informational purposes only and does not constitute legal, safety, or professional advice. Sunferno Automotive Accessories cannot verify how products are installed, used, or attached in your specific vehicle or situation — proper installation, use, and securement are solely the responsibility of the user. Laws and regulations vary by jurisdiction and change over time; always confirm current requirements with your local authorities or a qualified professional. Sunferno products must be used strictly in accordance with manufacturer instructions and applicable regulations.