Tyre pressure from psi to bar and kPa
- Input
- 32 psi to bar and kilopascals.
- Working
- 32 × 6,894.757293168 = 220,632.23 Pa. Bar: 220,632.23 ÷ 100,000 = 2.2063. kPa: 220,632.23 ÷ 1,000 = 220.63.
- Result
- 32 psi = 2.21 bar = 220.6 kPa
Pressure Converter
Convert pascals, bar, psi and atmospheres with exact defined factors and typical values for tyres and weather, in your browser. Runs entirely in your browser — your numbers never leave this device.
Atmospheres → Pounds per square inch
14.695949 psi
1 atm = 14.695949 psi
| Unit | Value |
|---|---|
| Pascals (Pa) | 101,325 Pa |
| Kilopascals (kPa) | 101.325 kPa |
| Bar (bar) | 1.01325 bar |
| Atmospheres (atm) | 1 atm |
| Pounds per square inch (psi) | 14.695949 psi |
| Torr (Torr) | 760 Torr |
| Millimetres of mercury (mmHg) | 759.999892 mmHg |
How it works
Pascals = value × factor of the source unit (bar = 100,000 Pa, atm = 101,325 Pa, psi = 6,894.757293168 Pa); then divide by the target unit's factor
| Typical value | psi | Bar | kPa | atm |
|---|---|---|---|---|
| Sea-level air pressure (1 atm) | 14.70 | 1.013 | 101.33 | 1 |
| Typical car tyre (32 psi) | 32 | 2.21 | 220.63 | 2.18 |
| Bicycle tyre (example, 60 psi) | 60 | 4.14 | 413.69 | 4.08 |
| Home water pressure (example, 3 bar) | 43.51 | 3 | 300 | 2.96 |
| Scuba cylinder, full (about 200 bar) | 2,900.75 | 200 | 20,000 | 197.38 |
The pascal is the base unit here: 1 Pa is one newton per square metre. The working units are defined against it exactly — 1 bar = 100,000 Pa, 1 standard atmosphere = 101,325 Pa, and 1 psi (one pound-force per square inch) = 6,894.757293168 Pa, which follows from the exact pound and inch definitions. Kilopascals are simply thousands of pascals, so tyre and weather figures move between Pa and kPa by a factor of 1,000.
Bar and atmosphere are close but not equal, and that gap matters at high pressure: 1 atm = 1.01325 bar, so a scuba cylinder filled to about 200 bar holds 200 × 100,000 ÷ 101,325 = 197.38 atm. At weather-report pressures the difference is small; at cylinder pressures it is several atmospheres.
Psi remains the everyday unit for tyres in the US and UK, while placards increasingly print bar and kPa alongside. A typical car tyre at 32 psi is 32 × 6,894.757293168 = 220,632 Pa, which is 220.6 kPa or 2.21 bar. The table collects those everyday anchors so a converted figure can be sanity-checked at a glance.
Worked examples
Scuba cylinder pressure to psi
- Input
- 200 bar to psi.
- Working
- 200 × 100,000 = 20,000,000 Pa. Then 20,000,000 ÷ 6,894.757293168 = 2,900.7548.
- Result
- 200 bar = 2,900.75 psi
Bar to psi for a pump gauge
- Input
- 2.5 bar to psi.
- Working
- 2.5 × 100,000 = 250,000 Pa. Then 250,000 ÷ 6,894.757293168 = 36.2594.
- Result
- 2.5 bar = 36.26 psi
Frequently asked questions
How many psi are in a bar?
100,000 ÷ 6,894.757293168 = 14.5038 psi in one bar. So doubling a bar figure gives a rough psi estimate that is too low — 2 bar is 29.01 psi, not 28 — and at tyre pressures the exact factor is worth using, since half a bar is about 7.25 psi.
Is a bar the same as an atmosphere?
No, though they are close. One atmosphere is defined as 101,325 Pa and one bar as 100,000 Pa, so 1 atm = 1.01325 bar. Weather and tyre work barely notice the 1.3% gap, but at scuba-cylinder pressures around 200 bar the difference is nearly 3 atm.
What is standard sea-level pressure in each unit?
By definition, 1 atm = 101,325 Pa = 101.325 kPa = 1.01325 bar = 14.6959 psi. Actual sea-level pressure varies with the weather around that standard value, which meteorologists report in hectopascals (millibars) — 1 hPa is 100 Pa.
Does this converter handle gauge versus absolute pressure?
The arithmetic converts the number you enter between units; it does not add or remove the atmospheric offset. Tyre gauges read gauge pressure (above atmospheric), while some engineering figures are absolute. If you need absolute, add about 1.013 bar or 14.70 psi to a gauge reading before converting.
Why do some gauges show kPa in hundreds?
Because a kilopascal is a fairly small unit for tyre work: 220 kPa sounds larger than 2.21 bar for the same pressure. The three figures describe the same pressure — 32 psi = 220.63 kPa = 2.21 bar — and converting between them is a pure scaling by the exact factors in the table.
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