Unit Tools

Free Online Pressure Converter, PSI, Bar, kPa, Atmospheres & mmHg

Convert psi to bar, kPa to psi, atmospheres to bar, mmHg and more. Useful for tyre pressure, which is quoted in psi in some countries and bar in others, and for gauges and blood pressure in mmHg. Answers appear as you type and each one shows the exact factor used.

Answers As You Type Exact Factors Runs In Your Browser

Free Online Pressure Converter, PSI, Bar, kPa, Atmospheres & mmHg

1 bar is 14.5 psi, near enough. The exact figure is 14.5038, and for tyres that rounding never matters. Bar is not an SI unit but it survives because it sits so close to normal air pressure: one bar is roughly what the atmosphere presses on you at sea level.

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💨 Pressure Converter Base unit: Pascal · 9 units

Every factor ships with the page. The sum runs in your browser and nothing is sent anywhere.

💨 Convert pressure

Pick the two units, type a number, and the answer is already there.

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Common Pressure Conversions

The ones people look up most. No typing needed.

Conversion	This	Equals
bar to psi	1 bar	14.5038 psi
psi to bar	1 psi	0.0689476 bar
psi to kPa	1 psi	6.89476 kPa
kPa to psi	1 kPa	0.145038 psi
bar to kPa	1 bar	100 kPa
MPa to psi	1 MPa	145.038 psi
atm to psi	1 atmosphere	14.6959 psi
atm to bar	1 atmosphere	1.01325 bar
atm to mmHg	1 atmosphere	760 mmHg
2.1 bar in psi	2.1 bar	30.46 psi
2.2 bar in psi	2.2 bar	31.91 psi
2.3 bar in psi	2.3 bar	33.36 psi
35 psi to bar	35 psi	2.41 bar
2.6 bar to psi	2.6 bar	37.71 psi
240 kPa to psi	240 kPa	34.81 psi
220 kPa to bar	220 kPa	2.2 bar
typical car tyre	32 psi	2.21 bar
36 psi to bar	36 psi	2.48 bar
espresso machine	9 bar	130.5 psi
average sea level pressure	1,013 mbar	1 atmosphere

Tyre Pressure Chart: bar to psi

When the door sticker says bar and the pump says psi.

Bar	psi	kPa
1.8 bar	26 psi	180 kPa
2.0 bar	29 psi	200 kPa
2.1 bar	30.5 psi	210 kPa
2.2 bar	32 psi	220 kPa
2.3 bar	33.5 psi	230 kPa
2.4 bar	35 psi	240 kPa
2.5 bar	36 psi	250 kPa
2.6 bar	38 psi	260 kPa
2.8 bar	40.5 psi	280 kPa
3.0 bar	43.5 psi	300 kPa

If your sticker shows 220 rather than 2.2, that is kPa, and it is the same pressure. Set tyres cold, before you drive, because a warm tyre reads a few psi high and you will end up under-inflated. The figure on the door is the one to follow, not the number moulded into the tyre wall, which is a maximum rather than a target.

How to Convert Pressure

Four steps, and not one of them needs a server.

Choose bar, psi or kPa

Pascals up to megapascals, plus bar, psi, atmospheres, torr and mmHg. Everything is in both lists.

Type the pressure

The pressure appears in the second box as you type. No convert button, and nothing leaves the device.

Doing tyres?

The chart on this page runs from 1.8 to 3.0 bar with the psi and kPa beside it, so you can read it at the pump.

Save the pairs you repeat

Save bar to psi, kPa to psi or whichever pair you run daily, and pick recent pressures back up from history.

Every Pressure Unit, and What It Equals

All 9 units in this converter, measured against one pascal.

Unit	1 unit equals
Pascal (Pa)	1 pascal (the base unit)
Kilopascal (kPa)	1,000 pascal
Megapascal (MPa)	1,000,000 pascal
Bar (bar)	100,000 pascal
Millibar (mbar)	1 pascal
Pound per square inch (psi)	6894.75729317 pascal
Atmosphere (atm)	101,325 pascal
Torr *	133.322368421 pascal
Millimetre of mercury (mmHg) *	133.322387415 pascal

* Units marked with a star are approximate by nature. Hover the star to see why.

What This Converter Does

And what it will not quietly get wrong.

psi appears as you type

Type a figure in bar and the psi answer is already there, with kPa and atmospheres beside it.

Tyre chart on the page

1.8 to 3.0 bar with psi and kPa beside it. The whole range, so you do not search again at the pump.

Exact definitions

A bar is exactly 100,000 Pa and an atmosphere exactly 101,325. These are definitions, not measurements.

Torr and mmHg kept apart

They differ in the seventh digit. Most converters merge them. This one lists both and says why.

Your usual pressure pairs

Keep bar to psi, or kPa to psi, one tap away, and pick any recent pressure back up where you left it.

Keeps going offline

Every pressure factor ships with the page, so there is no account to make, nothing to upload and no server to call.

Frequently Asked Questions

What people actually ask about pressure.

Multiply by 14.5038. So 2.2 bar is 32 psi. For tyres, "times fourteen and a half" is close enough to do in your head at the pump, and the half a psi you lose to rounding is smaller than the gauge can measure anyway.

36 psi, near enough. The exact figure is 36.26, but tyre gauges work in half psi steps so 36 is what you set. There is a full chart on this page from 1.8 up to 3.0 bar, which covers almost every car door sticker you will meet.

Because the car was specified in Europe and the pump was not. European makers print bar or kPa on the door sticker, while forecourt airlines in Britain and America read psi. Nothing is wrong, the two just came from different systems. The chart above bridges them.

Multiply by 6.89476. So 32 psi is 220.6 kPa. Some car stickers use kPa instead of bar, and the two are easy to mix up because a kPa number looks a hundred times bigger. If your sticker says 220, that is kPa. If it says 2.2, that is bar. Same pressure.

101,325 pascals, which is 14.6959 psi or 1.01325 bar. That is the standard air pressure at sea level. Bar was chosen to sit close to it deliberately, which is why the two numbers are so nearly the same and why bar caught on despite not being an SI unit.

Almost nothing, but they are defined differently. A torr is exactly 1/760 of an atmosphere. A millimetre of mercury comes from the density of mercury under standard gravity. The two agree to about one part in seven million, so only very precise lab work ever notices. Both are listed here rather than merged, because a definition is a definition.

Gauge. A tyre gauge reads the pressure above the surrounding air, not the total. So 32 psi in a tyre is really about 46.7 psi absolute once you add the atmosphere pushing from outside. Every tyre figure on this page is gauge pressure, which is what you set at the pump.

The main ones are definitions and carry no error: a bar is exactly 100,000 pascals, an atmosphere is exactly 101,325, and a psi is exactly 6,894.757293168361. The torr and mmHg are the only pair with a real difference, and both are listed rather than quietly treated as identical.

No. The pascal, bar, psi and atmosphere factors are written into the page, so the sum runs on your own machine. The pressures you looked up and the pairs you saved stay in this browser on this device, and Settings clears them for good.