Convert psi to bar. Multiply by 0.0689476, with tyre pressure tables for cars, bicycles and motorcycles.

The formula

bar = psi × 0.06894757293

The factor is exact. A psi is one pound-force over one square inch, both exactly defined, giving 6894.757293168 Pa; a bar is defined as exactly 100,000 Pa.

To go the other way, multiply by 14.5037738. See bar to psi.

Quick reference

psi	bar	kPa
1 psi	0.069 bar	6.9 kPa
14.5 psi	1.00 bar	100 kPa
20 psi	1.38 bar	137.9 kPa
28 psi	1.93 bar	193.1 kPa
30 psi	2.07 bar	206.8 kPa
32 psi	2.21 bar	220.6 kPa
35 psi	2.41 bar	241.3 kPa
40 psi	2.76 bar	275.8 kPa
100 psi	6.89 bar	689.5 kPa

Car tyres

This is the conversion’s main job. Tyre placards in the US and much of Asia are in psi; European cars and pumps use bar, and the numbers people remember are in whichever they grew up with:

psi	bar	Typical for
28 psi	1.93 bar	small car, front
30 psi	2.07 bar	small car
32 psi	2.21 bar	mid-size car — the most common figure
35 psi	2.41 bar	SUV, or a loaded car
40 psi	2.76 bar	light van
50 psi	3.45 bar	van, laden

32 psi is 2.2 bar is the single pairing worth memorising.

Tyre pressure is a gauge pressure — the excess over atmospheric — so a tyre at 32 psi holds about 46.7 psi absolute. Converting the number does not change that.

Bicycles and motorcycles

	psi	bar
Mountain bike	25–35 psi	1.72–2.41 bar
Gravel	35–50 psi	2.41–3.45 bar
Road bike, 28 mm	65–80 psi	4.48–5.52 bar
Road bike, 25 mm	85–100 psi	5.86–6.89 bar
Motorcycle	32–42 psi	2.21–2.90 bar

Road bike pressures are the ones where the two scales feel most different: 100 psi sounds like a lot and 6.9 bar sounds like a little, and they are the same.

Other units on the same gauge

Many gauges in Taiwan and Japan carry a kgf/cm² scale beside the psi one. It is close enough to bar to be mistaken for it:

psi	bar	kgf/cm²
30 psi	2.07	2.11
32 psi	2.21	2.25
35 psi	2.41	2.46

1 kgf/cm² is 0.980665 bar — about 2% lower. Reading a kgf/cm² scale as bar under-inflates by roughly 2%, which is within most tolerances but is not nothing.

Estimating in your head

Divide by 14.5, or divide by 15 and add 3%. 32 ÷ 15 is 2.13 against a true 2.21 bar. Even simpler: halve it and shift the decimal — 32 becomes 1.6, then add a third to get 2.13.

PSI to bar