Skip to content
ENExplore Calculators

Tyre Pressure Adjustment Calculator

Work out tyre pressure adjustment instantly with clear inputs, formula shown and shareable results.

About Tyre Pressure Adjustment Calculator

Tyre pressure falls about 0.01 bar (0.15 psi) per degree Celsius of temperature drop, so a 12 degree cold snap costs over a tenth of a bar. Extra load needs extra pressure, which is why door-jamb placards list a separate laden figure.

Formula

Pressure adjustment

pressure change = -0.0096 bar per degree C; load increase adds roughly proportionally

Worked example

With the default values below, Tyre Pressure Adjustment Calculator returns Adjusted pressure of 2.56. Change any input above and every figure here is recalculated in your browser.

Inputs used

Recommended cold pressure
2.3 bar
Temperature change since setting
-12 °C
Extra load carried
180 kg
Vehicle kerb weight
1,450 kg

Results

Adjusted pressure
2.56 bar
Change from temperature
-0.12 bar
Increase for the extra load
0.14 bar
Adjusted pressure
37.10 psi

Step by step

  1. 1Values used
  2. 2Pressure adjustment
  3. 3Adjusted pressure= 2.56 bar
  4. 4Change from temperature= -0.12 bar
  5. 5Increase for the extra load= 0.14 bar
  6. 6Adjusted pressure= 37.10 psi

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax or compounding frequency into account.
  • Figures are rounded for display to 2 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

Should pressure be checked hot or cold?

Cold, before driving. A warm tyre reads 0.2-0.3 bar higher, and letting that out leaves it underinflated when cool.

What does underinflation cost?

Fuel economy falls 1-2% for every 0.1 bar low, tyre shoulders wear rapidly, and heat build-up raises the risk of a blowout.

Related Calculators

Tyre Pressure Adjustment Calculator | Calcrivo