PSI to Bar Converter

Convert psi to bar instantly, with a reference table covering tyre pressures, espresso machines and compressors.

Pounds per square inch

Bar

1 psi = 0.0689 bar

Multiply pounds per square inch by 0.06894757 to get bar.

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Pounds per square inch to bar reference table

The conversions people look up most often, rounded to 4 decimal places.

Common pounds per square inch to bar conversions
Pound per square inch (psi)	Bar (bar)
1 psi	0.0689 bar
14.5 psi	0.9997 bar
15 psi	1.0342 bar
20 psi	1.379 bar
30 psi	2.0684 bar
32 psi	2.2063 bar
35 psi	2.4132 bar
40 psi	2.7579 bar
45 psi	3.1026 bar
60 psi	4.1369 bar
100 psi	6.8948 bar
130 psi	8.9632 bar
150 psi	10.3421 bar

The pounds per square inch people look up most

32 psi = 2.2063 bar: A common car tyre pressure - which is why a European placard reading "2.2" means 32 psi, not 22.
35 psi = 2.4132 bar: The pressure most cars want when loaded, against 32 psi unladen - check the door placard rather than the tyre wall.
100 psi = 6.8948 bar: A road bicycle tyre, roughly three times a car tyre and far beyond what a forecourt pump will reach.
3,000 psi = 206.8427 bar: An American scuba cylinder rating, against the European 200 or 300 bar cylinders.

How the psi to bar calculation works

One psi is 0.0689476 bar:

bar = psi × 0.0689476

A bar is defined as exactly 100,000 pascals, which is very close to atmospheric pressure at sea level — 1 atm is 1.01325 bar, or 14.696 psi. That near-equality is the whole point of the unit: one bar is "about one atmosphere", which makes pressure readings intuitive.

Tyre pressures are the everyday case, and the numbers on the two scales look nothing alike:

psi	bar	Typical use
30	2.07	Small car front
32	2.21	Common car pressure
35	2.41	Loaded car, larger tyres
40	2.76	Van, or high-load setting
100	6.89	Road bicycle tyre
130	8.96	Track bicycle tyre

A European car door placard gives bar; an American gauge reads psi. A tyre at "2.2" on a European placard needs 32 psi, not 22 — and inflating to 22 psi is dangerously soft.

Gauge versus absolute. Tyre gauges read gauge pressure, meaning pressure above atmospheric. A tyre reading 32 psi holds 46.7 psi absolute. Scientific and refrigeration work uses absolute (psia); everything automotive uses gauge (psig). Mixing them is a one-atmosphere error.

Espresso machines are specified at 9 bar, which is 130.5 psi — the standard extraction pressure. Home machines claiming "15 bar" (217.6 psi) are quoting pump capability, not brew pressure.

For a quick figure, divide psi by 14.5.

Frequently asked questions

Should tyres be set hot or cold?

Cold, meaning before the car has been driven more than a mile or two. Tyres warm as they roll and the pressure climbs with the temperature, typically by 2 to 4 psi, or 0.15 to 0.3 bar, after a motorway run. Placard figures are cold figures, so setting a hot tyre to the placard number leaves it under-inflated once it cools - and never bleed air from a hot tyre to reach a cold target.

How much does cold weather drop tyre pressure?

Roughly 1 psi for every 10°F, or about 0.11 bar per 10°C, because the gauge reading follows the absolute temperature of the air inside. A tyre set to 32 psi on a mild day reads nearer 29 psi after a hard frost. That is why dashboard pressure warnings cluster on the first genuinely cold morning of the year rather than on the day a slow puncture started.

What pressure does a pressure cooker run at?

American stovetop cookers are built around 15 psi gauge, which is 1.03 bar above atmospheric and gives about 121°C inside. Most electric multicookers run lower, around 11 to 12 psi or 0.8 bar, so a recipe timed for a stovetop cooker needs longer in one. European cookers are specified in bar directly, usually as a 0.8 and a 1.0 bar setting.

PSI to Bar Converter