How to calculate tyre pressure

Author Name – Jack Underwood

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Having the correct tyre pressure is vital to keep you safe on the road. In this article, we are going to show you how you can find out the correct tyre pressures for your vehicle.

tyre pressures calculator

Either over-inflated or under-inflated tyres can negatively affect your overall driving performance by harming the tyre tread. In some instances, both over-inflated and under-inflated tyres can cause the tyres to become unsafe and illegal to drive.

Every year, dangerous tyres lead to around 5,000 convictions, 900 casualties, and 160 deaths or serious injuries. Not only that, but illegal tyres can actually end up costing you more than the price of a new set: you could face fines of up to £2500 and 3 points on your licence per illegal tyre, not to mention that if you're found to have illegal tyres in an accident, it can invalidate your insurance.

A free tyre check from National can make sure your four wheels are ready for the road. Book in now to stay safe on your journeys.

Book a Free Tyre Check

Tyre Pressure Calculator Online

Here at National, we offer a quick, easy and simple way for you to find out the correct tyre pressures for your vehicle by using our tyre pressures calculator.

To calculate the correct tyre pressures for your vehicle, all you need to do is click the green button below. You will be taken to our 'Tyre Pressures' page on our website where you will be required to enter your vehicle registration number. Once you have entered this, you will be shown the recommended tyre pressures for your front tyres and also your rear tyres.

Tyre Pressures Check

Please note, the tyre pressure lookup that we use is provided by the DVLA and HaynesPro. If your vehicle's tyres are different from the original fitment, then these results may differ slightly from those listed within the vehicle manufacturer's handbook.

Checking Tyre Pressures

If you want to check your tyre pressures, then you can pop into your local National branch and our branch staff will be able to conduct a tyre pressure check and adjustment for free.

Book a Free Safety Check

Safety checks are perfect for any drivers who haven't driven their car for an extended period of time and are looking for that extra peace of mind. Your tyres, tyre pressures, TPMS, car battery, engine oil, wiper blades and bulbs will be checked. Your vehicle will then be put on the ramp and the shock absorbers, brakes and exhaust will also be inspected.

Free Safety Checks are offered at all of our branches and can be booked online. Once the safety check has been completed, you will receive feedback from the inspection via one of our branch staff.

To book a free safety check for your vehicle, where your tyre pressures will also be checked and adjusted if needed, please click on the button below. 

Book a Safety Check Now

Checking Tyre Pressures at Home/Work

If you want to check your own tyre pressures, then this can be done by either using a tyre pressure gauge or a digital tyre inflator. By using either a tyre pressure gauge or a tyre inflator, you will be able to find and record the PSI of each tyre.

Tyre Pressure FAQ's

To find out everything you need to know about tyre pressures, head to our Tyre Pressures FAQ page. To access this, please click on the green button below.


If you notice that your tyres are regularly losing pressure, then this could indicate that you have a slow puncture. Some punctures may be repairable. To find out everything you need to know about tyre repairs, please click on the article below.

Puncture Repairs

Alternatively, if the tyre is unrepairable, you will need to purchase a new tyre for your vehicle. At National, we stock a wide range of tyres to fit any budget. We also offer Payment Assist, both online and in-branch to allow our customers to spread the cost monthly. For terms and conditions of Payment Assist, please click on the article below.

Payment Assist

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