Tire Pressure Calculator

The correct tire pressure is listed on a sticker in your driver door jamb or in your owner manual. This is the cold tire pressure recommended by the manufacturer, typically between 30-35 PSI for passenger vehicles. Never use the maximum pressure shown on the tire sidewall as your target pressure.

Tire pressure changes approximately 1 PSI for every 10°F change in temperature. As temperatures drop in winter, your tires lose pressure. As they warm up from driving or hot weather, pressure increases. Always check tire pressure when tires are cold (before driving or after sitting 3+ hours).

Yes, when carrying additional weight (passengers, cargo, towing), you should increase tire pressure. Add approximately 1 PSI for every 100 lbs of extra load. Check your vehicle manual for specific load-adjusted pressure recommendations, especially for towing or maximum payload.

Atmospheric pressure decreases with altitude, which can affect tire pressure readings. At higher elevations (above 3,000 feet), tire pressure may read slightly lower. Adjust approximately 1 PSI lower for every 3,000 feet of elevation gain to maintain proper tire contact and wear.

Underinflated tires cause increased rolling resistance, reduced fuel economy (up to 3% loss), faster tire wear on outer edges, poor handling, longer stopping distances, and increased heat buildup that can lead to tire failure. Even 5 PSI low can significantly impact performance and safety.

Overinflated tires cause a harsher ride, reduced traction (smaller contact patch), faster wear in the center of the tread, increased risk of damage from road hazards, and unpredictable handling. The tire is more susceptible to impact damage and blowouts.

Check tire pressure at least once a month and before long trips. Tires naturally lose 1-2 PSI per month through normal permeation. Seasonal temperature changes require more frequent checks. Always check when tires are cold for accurate readings.

Yes, many vehicles specify different pressures for front and rear tires due to weight distribution and handling characteristics. Front tires often require higher pressure on front-wheel-drive vehicles. Always follow the manufacturer specifications on your door jamb sticker.

For extended highway driving, some manufacturers recommend adding 3-4 PSI to the cold tire pressure to compensate for increased heat buildup at sustained high speeds. However, never exceed the maximum pressure listed on the tire sidewall. Check your owner manual for specific recommendations.

Nitrogen maintains more stable pressure across temperature changes and permeates through rubber slower than air. However, regular air (78% nitrogen) works fine for most drivers. Nitrogen benefits are marginal for everyday driving but can be useful for racing or vehicles stored long-term.