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.

The link carries the values you entered, so whoever opens it sees the same result. Nothing is stored on our side — the numbers travel in the link itself.

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

How the psi to bar converter 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

How do I convert pounds per square inch to bar?

Multiply the number of pounds per square inch by 0.0689475729 to get bar.

How many bar are in 30 psi?

30 psi equals 2.0684 bar. The reference table on this page lists the other values people look up most often.

How do I convert bar back to pounds per square inch?

Divide the number of bar by 0.0689475729, or use the swap control on the converter above.

Is this conversion exact?

Yes. The factor is fixed by international definition rather than measured, so the conversion is exact - only the displayed rounding limits precision.

PSI to Bar Converter