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Tire Pressure Temperature Guide

Adjust cold tire pressure for a change in ambient temperature using the ideal-gas law.

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Need Adjusted pressure? The Tire Pressure Temperature Guide derives it from Current pressure (bar), Temperature when set (°C), New temperature (°C) in one step. For instance, with Current pressure (bar) = 2.3, Temperature when set (°C) = 20 and New temperature (°C) = 0 it returns Adjusted pressure = 2.143 bar.

How to use it

  1. Enter your values: Current pressure (bar), Temperature when set (°C), New temperature (°C).
  2. Read the result instantly: Adjusted pressure.

Frequently asked questions

What does the Tire Pressure Temperature Guide actually compute?

It takes Current pressure (bar), Temperature when set (°C) and New temperature (°C) and derives Adjusted pressure from them. The calculation is live as you type, so the result updates on every change.

What information do I need to provide?

3 values: Current pressure (bar), Temperature when set (°C) and New temperature (°C). Nothing else is required — no account, no file upload.

Can you show a worked example?

With Current pressure (bar) = 2.3, Temperature when set (°C) = 20 and New temperature (°C) = 0, the calculator returns Adjusted pressure = 2.143 bar. Those figures come from running this exact tool, so you can reproduce them by entering the same values.

What happens if I enter larger values?

It moves a lot. Using Current pressure (bar) = 4.6, Temperature when set (°C) = 40 and New temperature (°C) = 5 instead, Adjusted pressure goes from 2.143 bar to 4.086 bar — which is why it is worth testing a few scenarios rather than trusting a single figure.

What does it give for smaller values?

Scaled down to Current pressure (bar) = 1.1, Temperature when set (°C) = 10 and New temperature (°C) = 1, Adjusted pressure comes out at 1.065 bar. The relationship is worth checking at both ends before you rely on a single result.

When would I actually use this?

Between garage visits: checking a tyre size is an allowed substitute, working out when the next service is due, and knowing what a wear threshold means.

What is the most common mistake?

Changing tyre size without keeping the rolling circumference. More than a couple of percent off and the speedometer, the odometer and the driver aids all read wrong.

How accurate is it, and what are the limits?

Estimate only — always follow the pressure on your vehicle's door-jamb placard.

What is the difference between the Tire Pressure Temperature Guide and the Tire Size Calculator?

This one returns Adjusted pressure; the Tire Size Calculator returns Overall diameter and Circumference. That is the whole difference — open the one whose figure you need.

Is there a tool for the next step?

Tire Tread Wear Calculator is the closest one after this: Estimate your tyre wear rate from two tread measurements or a known rate, then the distance and months left before the 2/32 in (1.6 mm) legal limit.

Further reading

All guides →
ExplainerWhat Tire Pressure Should I Use? Placard vs Max PressureUse the vehicle placard pressure, not the number on the tire. Learn why the sidewall figure is a maximum, why pressure is set cold, and how temperature moves it.ExplainerTyre Tread Depth: the Legal Limit Is Not the Safe LimitThe legal minimum exists to define an offence, not to describe a safe tyre. Tread does one job — getting water out of the contact patch — so its effect is near zero in the dry and decisive in the wet. Here is what the numbers say, and how to measure your own.ExplainerHow to Read Tire Size: What 205/55 R16 Actually MeansThe numbers on your tire sidewall decode into width, aspect ratio and rim diameter. Learn to read 205/55 R16 and work out the real overall diameter.GuideTowing Capacity: the Limit That Stops You FirstThere is no single towing capacity. There are four or five separate limits, and the one that binds is rarely the tow rating on the brochure — it is usually the vehicle's own weight budget, quietly consumed by the people sitting in it.ExplainerStopping Distance Is Mostly Not BrakingTotal stopping distance is two distances added together, and they follow different laws — one grows with speed, the other with speed squared. That single fact explains why doubling your speed roughly triples the distance.ExplainerHeadlight Aim and How Far You Can Actually SeeA dipped beam is aimed downward by a fraction of a degree, so its reach on flat road is a single division. Do it and you find that at motorway speed the beam is shorter than the stopping distance — and that a loaded boot can throw the whole calculation away.