Find your car's correct tire pressure on the driver's door jamb

The right amount of air for your tires is not a guess — it is a specific number printed on your car. Open the driver's side door and look at the edge where the door closes. You will see a sticker or placard with tire information. The number you need is labeled tire pressure or PSI (pounds per square inch). This is the pressure your tires should have when they are cold — meaning the car has not been driven for at least three hours, or has been driven less than a mile at low speed.

Do not use the maximum pressure printed on the tire itself. That number is the highest pressure the tire can safely hold, not the pressure your car needs. Using it will make your ride harsh and wear out your tires faster in the middle. The door jamb number is what matters.

Write down the PSI number or take a photo of the sticker before you go to check your tires. Most cars need between 30 and 35 PSI, but yours may be different depending on the vehicle weight and tire size.

Key Takeaways

  • Your car's correct tire pressure is printed on a sticker inside the driver's door jamb, not on the tire itself.
  • Check your tire pressure when the car is cold — after at least three hours of sitting or a short, slow drive.
  • You will need a tire pressure gauge, which costs five to fifteen dollars and is available at any auto parts store or gas station.
  • If your tires are low, add air at a gas station pump or tire shop; if they are over, let a small amount out by pressing the valve stem.

Get a tire pressure gauge and learn how to use it

A tire pressure gauge is a small handheld tool that measures how much air is in your tire. You can buy one at any auto parts store, gas station, or online for five to fifteen dollars. Digital gauges are easier to read than stick gauges, but both work. Keep one in your car so you can check pressure anytime.

To use the gauge, remove the plastic cap from the tire valve stem — the small metal nub sticking out of the wheel. Press the gauge firmly onto the valve stem until you hear a small hiss of air. Hold it steady for a second or two. The gauge will show a number. That number is your current tire pressure in PSI. Write it down and compare it to the number on your door jamb sticker.

If the gauge reading is within two PSI of the target number, your tire pressure is fine. If it is lower, you need to add air. If it is higher, you need to let some out.

Add air at a gas station or tire shop if pressure is low

Most gas stations have an air pump near the fuel pumps, usually free to use. Some tire shops and car washes also have them. Drive to the pump and park so the valve stem is straightforward to reach. Remove the plastic cap from the valve stem and keep it somewhere you will not lose it.

Attach the air hose to the valve stem firmly. The pump may have a dial or digital display showing the pressure as it fills. Many pumps let you set the target pressure, and they will stop automatically when you reach it. If yours does not, check the pressure with your gauge every few seconds to avoid overfilling.

When you reach the target pressure, remove the hose and replace the plastic cap on the valve stem. Check all four tires this way — do not assume they are all the same. The spare tire, if you have a full-size one, should also be checked and filled to the pressure listed on the door jamb sticker or in your owner's manual.

Let air out if your tires are overinflated

If your gauge reading is higher than the target pressure, you need to release some air. This is simpler than adding air. Press the small metal pin inside the valve stem with your finger or a small tool — a pen cap works. You will hear air escape. Press for one second, then check the pressure again with your gauge. Repeat until you reach the target number.

It is straightforward to let out too much air, so go slowly and check often. If you do let out too much, you can always add more air at a pump.

Check your tire pressure once a month and before long trips

Tires naturally lose air over time — about one PSI per month in normal conditions. Cold weather also causes pressure to drop. Make it a habit to check your tire pressure once a month, always when the car is cold. Many people check when they fill up with gas.

Before a long drive, check all four tires and the spare. Proper pressure improves fuel economy, makes steering easier, and helps your tires last longer. Underinflated tires wear out faster and can overheat, while overinflated tires wear unevenly and give a rough ride.

Understand what happens when pressure is wrong

Low tire pressure is the more common problem. When tires do not have enough air, the sidewalls flex more than they should. This creates extra heat and friction, which wears the tire faster and uses more fuel. Very low pressure can cause a blowout, especially on hot days or at highway speeds.

High tire pressure is less dangerous but still a problem. Overinflated tires wear out faster in the center of the tread, and they do not grip the road as well in wet conditions. Your car will also feel bouncy and harsh to ride in.

Checking pressure takes five minutes and costs nothing if you use a free pump. It is one of the easiest ways to keep your tires safe and make them last longer.

Frequently Asked Questions

Can I check tire pressure when the tires are warm?

You can, but the reading will be higher than the true cold pressure because air expands when heated. For the most accurate check, measure when the car has been parked for at least three hours. If you must check after driving, add about two PSI to the target number on your door jamb to account for heat.

What if I cannot find the tire pressure sticker on my door jamb?

Check the other door jambs, the fuel door, or inside the glove compartment. If it is missing, look up your car's year, make, and model online or call a tire shop. You can also find it in your owner's manual. Never guess or use the number on the tire sidewall.

Do I need to check the spare tire pressure?

Yes, if you have a full-size spare. Check it once or twice a year since spares sit unused. If you have a small temporary spare (donut), it usually needs higher pressure — check your manual for the correct number. A flat spare is useless in an emergency.

Why does my tire pressure warning light keep coming on?

This light means at least one tire is significantly underinflated. Check all four tires with a gauge and fill them to the correct pressure. If the light stays on after you fill them, you may have a slow leak. Drive to a tire shop to have them inspect for punctures or valve stem problems.