Home » Help & Advice » Tyre Pressure Converter: BAR / PSI Air Pressure

Tyre Pressure Converter: BAR / PSI Air Pressure

Checking and maintaining tyre pressure is a key part of car ownership – especially if you want your tyres to have a long life. 

To make it easy for customers to check tyre pressure and interpret the results, use the calculator below to convert BAR to PSI and PSI to BAR.

BAR/PSI Converter

Type a value into either the BAR/PSI field to convert the value.


What is tyre pressure?

Simply put, tyre pressure is a measure of how much air is in your tyre, and this is measured in either BAR pressure or pounds per square inch (PSI) – you can convert between them using our online tool. 

Why is tyre pressure important?

Everyday vehicle use will naturally reduce tyre pressure over time. While this is normal, car owners should keep on top of this by regularly checking their tyre pressure. Likewise, motorists should also keep assess when inflating tyres of whether their tyres are over-inflated, too. Both under-inflated and over-inflated tyres can affect how much of the tyre is in contact with the road – this, in turn, will influence safety, performance, longevity and fuel efficiency. 

The benefits of maintaining the correct tyre pressure include: 

  • Improves tyre performance 
  • Enhances vehicle safety
  • Extends the life of your tyres
  • Decreases the risk of blow-outs 
  • Increases fuel efficiency 

It’s therefore paramount that you’re keeping tyre pressure in line with the recommended figures for your specific vehicle. 

How do you measure tyre pressure?

  • Tyre pressure should be checked once a month. 
  • To get an accurate reading, check it only when your tyres are cold e.g. not immediately after being driven. 
  • It’s thought that warmer weather can decrease tyre pressure more rapidly, so make sure to check more regularly during the summer months.
  • The ideal tyre pressure is determined on a case-by-case basis, and will depend entirely on the make and model of your vehicle, alloys used, load carried, and typical passenger usage – front and rear tyres may also perform better at slightly different pressures to each other. This information can be found by a number of means, including the vehicle manual, inside your fuel cap, on the inner door frame or simply by contacting your vehicle manufacturer. 
  • Use a tyre pressure gauge to check the pressure, and carefully follow the instrument’s instructions. Many modern cars also have a sensor installed called a TPMS which alerts the driver to the decreasing or low tyre pressure. 
  • If you’re wondering what tyre pressure is measured in, units-wise, that’s where our converter tool can help. This is because tyre pressure can be measured in different units: BAR pressure or PSI (pounds per square inch) being the most commonplace. Being able to convert easily between them using our converter tool will help when applying manufacturer instructions, reading your gauge output, and communicating with your garage – as they may all operate in different units. 
  • Tyre pressure will also be checked by your trusted Mr Tyre autocentre during servicing. 


Mr Tyre are the trusted local autocentre for Central England, with over 35 branches across the region. Our team is committed to keeping your vehicle in prime health, thanks to our fast and efficient service. Whether you’re concerned about your tyre health, or would like our help to check your tyre pressure (free of charge), simply contact your local branch. Plus, we also offer nitrogen tyre inflation for those seeking greater tyre performance.

This website uses cookies to enhance your browsing experience... moregot it


COVID-19 update

The wearing of masks is now as a personal choice.

We are open for business. Read More