How many psi are in a bar?

One bar is about 14.5 psi. Car tyre pressures are often quoted in both, so 2.2 bar is roughly 32 psi.

What is standard atmospheric pressure?

One standard atmosphere is 101,325 pascals, which is 101.325 kilopascals, 1.01325 bar or about 14.7 psi.

What unit is used for tyre pressure in New Zealand?

Tyre pressure in New Zealand is usually given in psi or kPa. A typical car tyre is around 32 to 35 psi, which is about 220 to 240 kilopascals.

Pressure Converter

This pressure converter changes a figure between the many units used to measure pressure, the force pressing on each unit of area. Different fields favour different units, which makes conversion a constant need: science and engineering use pascals and kilopascals, weather reports use hectopascals or millibar, tyre pressures use psi or kilopascals, and older or industrial gauges use bar or atmospheres. You enter a value, choose the unit it is in and the unit you want, and the converter returns the result straight away. The conversions follow the standard definitions, where one kilopascal is 1000 pascals, one bar is 100,000 pascals, one standard atmosphere is 101,325 pascals, and one psi is about 6895 pascals, which makes a bar roughly 14.5 psi. This is handy for everyday jobs like checking tyre pressures, where a label in psi needs to match a pump reading in kilopascals, as well as for science homework, diving, weather and industrial work. As a quick reference, a typical New Zealand car tyre runs around 32 to 35 psi, which is about 220 to 240 kilopascals, and normal atmospheric pressure at sea level is about 101 kilopascals. Enter a value and pick your units to see the converted pressure straight away.

How it works

Every unit has a known size in pascals, the SI base unit of pressure. The converter turns your value into pascals, then into the unit you want, so any pair of units converts in a single step.

Worked example

A tyre at 2.2 bar is 2.2 times 100,000, which is 220,000 pascals, and dividing by 6895 gives about 31.9 psi.

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