Tyre pressure conversion – PSI, Bar and kPA

Tyre pressure is measured in different units, which can make it confusing—especially when you need to convert tyre pressure from Bar to PSI and kPa. To simplify things, we’ve explained how to measure and convert tyre pressure and provided an essential tyre pressure calculator to keep handy.

How is tyre pressure measured?

Regardless of the measurement, tyre pressure is calculated using the force per area exerted by air. Generally, we use three different units to measure tyre pressure: PSI, Bar, or KPI. Here’s a quick summary of each measurement:

  • PSI – the most commonly used measurement, which stands for pound force per square inch (PSI). It’s an imperial system, and is the standard measurement used in the US and UK.
  • Bar – is a metric unit commonly used for atmospheric pressure. It’s widely used in countries that rely on metric systems, including most of Europe.
  • kPa – refers to kilopascal, where 1 kilopascal equals 1000 pascals. It measures strength in hydraulics using a metric system, so it’s often used in Europe.

Tyre pressure conversion – Bar to PSI to kPa

If you need to convert measurements, use the tyre pressure calculator below. Using a tyre pressure chart can be a useful way of converting measurements. We’ve gone one step further and designed a convenient tyre pressure conversion tool to make your life easier.

Our calculator can help convert Bar to PSI, kPa to PSI as well as PSI to Bar. Simply input your PSI, Bar, or kPa and let our handy tyre pressure converter do the work for you.

Pressure Calculator

Type a value in any of the fields to convert between pressure measurements:

How do I convert tyre pressure?

You can use the tyre pressure conversion chart above to change PSi to kPa and Bar measurements, and vice versa. If you’d prefer to convert units manually, you can use formulas. It’s important to note these are approximate calculations.

Convert Bar to PSI

1 Bar is approximately equivalent to 14.504 PSI, so use this formula:

Bar x 14.504 = PSI.

Convert kPa to PSI

1 kPa is approximately equivalent to 6.895 PSI, so use this formula:

kPa x 6.895 = PSI

Remember, you can also convert from PSI to kPA, and PSI to Bar. To do so, switch the formulas around and divide rather than multiply. For example, to convert PSI to kPa, divide the PSI number by 6.895.

Should I measure tyre pressure in Bar, PSI, or KPA?

It doesn’t matter how you measure tyre pressure, as long as you use the correct tyre pressure conversion when changing units.

Usually, the measurement depends on your location or where the vehicle was manufactured. For instance, you may buy a German car that uses Bar but you live in the UK. You’ll likely need to convert from Bar to PSI. If unsure, check the vehicle handbook to see which unit is used.

Yes. Too much air increases the risk of blowouts and accidents. It also causes uneven tyre wear, which can affect vehicle performance and handling.

Ignoring the tyre pressure warning light is risky. Low air pressure increases the risk of punctures and damage to your tyres. It can also increase fuel consumption, which makes journeys much less fuel efficient.

You might need extra air when carrying weight, such as towing a caravan or trailer. Most vehicles have two recommended tyre pressures—one for regular driving and one for driving with additional loads. You can increase the air pressure to this level to help power your vehicle with extra weight. However, after removing the load, you should immediately return the air pressure to normal.

Generally, you should check tyre pressure every few weeks. Additionally, check tyre pressures before and after long journeys and after carrying excess weight. You should also check air pressure if it’s cold, as temperature drops can decrease pressure levels.

Tyre pressures vary from vehicle to vehicle. To find yours, check the vehicle handbook—it’s usually in the glove box or passenger door. Tyre pressures may also be listed inside the driver door or fuel cap. If you’re driving a modern vehicle, air pressure levels for each tyre are often displayed on the dashboard.

Same day tyre fitting

Did you know that we now offer same day tyre fitting service across our garages nationwide? Simply book online before 1pm and we can replace your tyres the same day to help you get you back on the road safely and swiftly. Please note that availability varies by location. For more information, please head on over to our dedicated same day tyre fitting page where you can find answers to frequently asked questions, choose the right tyres for your vehicle and book your appointment.

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