Tire pressure temperature calculator
Pressure falls about 1 PSI per 10°F — so the first cold morning of the season can light up the TPMS warning on perfectly healthy tires. See what yours should read right now.
On the driver's door jamb — not the "max" molded on the tire sidewall.
Expected pressure at 25°F
30.8PSI4.2 PSI below sticker from cold
Above the ~26PSI point where most TPMS lights trigger, so cold alone shouldn't set the light off. If the light is on anyway, a tire may actually be leaking — check each one with a gauge. Inflate back to 35 PSI cold — the sticker value, not the expected number above.
Rule of thumb: pressure moves about 1 PSI per 10°F. This calculator uses the ideal gas law, so it stays accurate across bigger swings — desert summer to deep-winter morning.