PSI ↔ Bar Converter
Convert between pounds per square inch (PSI) and bar instantly — both ways. Type in either box and the other updates live, with bonus conversions to kilopascals, atmospheres, mmHg and more, plus a live dual-scale pressure gauge.
Type a value in either box — the other converts automatically.
Controls how the converted values are rounded.
| Unit | Value |
|---|---|
| Convert to see all units | |
How to use the PSI to bar converter
Type into either box and the other updates as you go — psi to bar or bar back to psi, with kilopascals, atmospheres, mmHg and kg/cm² alongside, a live dual-scale gauge, and a report you can download.
Type into either box
Enter psi or bar — whichever your gauge, placard, or spec sheet gives you. The other converts live, no submit needed.
Set the decimal places
Auto rounds sensibly for the size of the number. Fix it at 1 or 2 decimals when you’re matching a gauge you can actually read.
Check it against something real
The comparison bars show your pressure against atmospheric, a car tire, and a road bike tire — a quick sanity check on the figure.
Read the dial & save a PDF
The gauge shows psi outside and bar inside on one needle. Ten unit conversions and a reference table download with it.
How the conversion is calculated
One bar is exactly 100,000 pascals. One psi is one pound-force spread over one square inch, which works out to 6,894.757 pascals. Divide one by the other and you get the only number this page really turns on: 1 bar = 14.503774 psi.
Worked example — a 32 psi car tire
As bar: 32 ÷ 14.503774 = 2.206 bar
As kilopascals: 2.206 × 100 = 220.6 kPa
As atmospheres: 32 ÷ 14.6959 = 2.18 atm
Back the other way: 2.2 bar × 14.503774 = 31.9 psi
2.2 bar is the setting to use — it lands within 0.1 psi of the placard, and it’s a mark that actually exists on a bar gauge.
PSI and bar conversion charts
The lookups that come up most — the conversion both ways, the tire pressures everyone searches for, every pressure unit side by side, and a set of familiar pressures to check your figure against.
| PSI | Bar | Kilopascals | Atmospheres |
|---|---|---|---|
| 1 psi | 0.069 bar | 6.89 kPa | 0.068 atm |
| 5 psi | 0.345 bar | 34.47 kPa | 0.340 atm |
| 10 psi | 0.689 bar | 68.95 kPa | 0.681 atm |
| 15 psi | 1.034 bar | 103.42 kPa | 1.021 atm |
| 20 psi | 1.379 bar | 137.90 kPa | 1.361 atm |
| 30 psi | 2.068 bar | 206.84 kPa | 2.041 atm |
| 32 psi | 2.206 bar | 220.63 kPa | 2.178 atm |
| 35 psi | 2.413 bar | 241.32 kPa | 2.382 atm |
| 40 psi | 2.758 bar | 275.79 kPa | 2.722 atm |
| 50 psi | 3.447 bar | 344.74 kPa | 3.403 atm |
| 100 psi | 6.895 bar | 689.48 kPa | 6.805 atm |
| 150 psi | 10.342 bar | 1,034.21 kPa | 10.207 atm |
| 200 psi | 13.790 bar | 1,378.95 kPa | 13.609 atm |
The useful anchor in this table is 14.5 psi ≈ 1 bar. Halve it and 7.25 psi is half a bar; double it and 29 psi is 2 bar.
| Bar | PSI | Kilopascals | Atmospheres |
|---|---|---|---|
| 0.5 bar | 7.25 psi | 50 kPa | 0.493 atm |
| 1 bar | 14.50 psi | 100 kPa | 0.987 atm |
| 1.5 bar | 21.76 psi | 150 kPa | 1.480 atm |
| 2 bar | 29.01 psi | 200 kPa | 1.974 atm |
| 2.5 bar | 36.26 psi | 250 kPa | 2.467 atm |
| 3 bar | 43.51 psi | 300 kPa | 2.961 atm |
| 4 bar | 58.02 psi | 400 kPa | 3.948 atm |
| 5 bar | 72.52 psi | 500 kPa | 4.935 atm |
| 6 bar | 87.02 psi | 600 kPa | 5.922 atm |
| 8 bar | 116.03 psi | 800 kPa | 7.895 atm |
| 10 bar | 145.04 psi | 1,000 kPa | 9.869 atm |
Bar values are round by design — the unit was chosen to be tidy in metric terms, which is why the psi column is the messy one here and the reverse is true above.
| Tire | Typical PSI | Bar | Kilopascals |
|---|---|---|---|
| Mountain bike | 25–35 psi | 1.7–2.4 bar | 172–241 kPa |
| Gravel / hybrid bike | 50–70 psi | 3.4–4.8 bar | 345–483 kPa |
| Road bike | 90–120 psi | 6.2–8.3 bar | 621–827 kPa |
| Passenger car | 30–35 psi | 2.1–2.4 bar | 207–241 kPa |
| SUV / light truck | 32–40 psi | 2.2–2.8 bar | 221–276 kPa |
| Motorcycle | 32–42 psi | 2.2–2.9 bar | 221–290 kPa |
| Van / light commercial | 45–65 psi | 3.1–4.5 bar | 310–448 kPa |
| Compact spare | 60 psi | 4.1 bar | 414 kPa |
These are typical ranges, not a substitute for the placard on your door jamb or the sidewall maximum. Set every tire cold, before driving.
| Unit | What it is | In bar | In psi |
|---|---|---|---|
| Bar | Exactly 100,000 pascals | 1 bar | 14.5038 psi |
| PSI | Pound-force per square inch | 0.068948 bar | 1 psi |
| Kilopascal (kPa) | 1,000 pascals — the SI unit | 0.01 bar | 0.145038 psi |
| Megapascal (MPa) | 1,000,000 pascals | 10 bar | 145.038 psi |
| Millibar (mbar) | One thousandth of a bar | 0.001 bar | 0.0145038 psi |
| Atmosphere (atm) | Standard sea-level pressure | 1.01325 bar | 14.6959 psi |
| Torr / mmHg | One 760th of an atmosphere | 0.00133322 bar | 0.0193368 psi |
| Inch of mercury (inHg) | Barometric and vacuum work | 0.0338639 bar | 0.491154 psi |
| kg/cm² (at) | Technical atmosphere | 0.980665 bar | 14.2233 psi |
Three units cluster within about 2 percent of each other — bar, atmosphere, and kg/cm² — and they are the ones most often swapped by mistake. The converter keeps them separate.
| Where you meet it | PSI | Bar | Kilopascals |
|---|---|---|---|
| Blood pressure, 120 mmHg | 2.3 psi | 0.16 bar | 16 kPa |
| Atmosphere at sea level | 14.7 psi | 1.01 bar | 101.3 kPa |
| Car tire | 32 psi | 2.21 bar | 220.6 kPa |
| Home water supply | 40–80 psi | 2.8–5.5 bar | 276–552 kPa |
| Shop air compressor | 90–150 psi | 6.2–10.3 bar | 621–1,034 kPa |
| Road bike tire | 100 psi | 6.89 bar | 689 kPa |
| Espresso brew pressure | 130 psi | 9 bar | 900 kPa |
| Truck air brake system | 120 psi | 8.3 bar | 827 kPa |
| Pressure washer | 1,500–3,000 psi | 103–207 bar | 10,300–20,700 kPa |
| Full scuba cylinder | 3,000 psi | 207 bar | 20,700 kPa |
Espresso is the clearest case of a unit choice sticking: the machine is spec’d at 9 bar worldwide, including in the US, because that’s the number the industry standardised on.
Almost every pressure you’ll ever read is gauge pressure — measured against the air around it. That’s why a flat tire reads zero even though it still holds atmospheric pressure inside. Absolute pressure starts from a vacuum instead, so it’s always higher by one atmosphere: 14.7 psi, or 1.013 bar.
- The conversion factor is the same either way — 14.503774 converts psi to bar whether the reading is gauge or absolute. Only the baseline differs.
- Tires, compressors and washers are all gauge — if nothing on the gauge or spec says otherwise, assume psig or barg.
- Weather, vacuum and process work use absolute — barometric pressure, HVAC refrigerant tables, and lab equipment are usually quoted in absolute terms.
Everything the converter works out
One figure in either box gives you the full picture — every common pressure unit, a scale you can picture, a dial that reads both ways, and a report you can keep.
The figures behind every pressure reading
Built for anyone reading the wrong scale
Gauges, placards, manuals and spec sheets rarely agree on a unit — and the two most common ones sit a factor of 14.5 apart, so a misread is never a small one.
Standing at a forecourt air pump marked in bar with a door placard printed in psi, or pumping a road tire rated at 8 bar with a floor pump that only shows psi.
- 2.2 bar is the everyday 32 psi
- Set them cold, before you drive
- Never exceed the sidewall maximum
Matching an air tool rated in bar to a compressor gauge in psi, checking a pressure washer spec, or setting a regulator on imported equipment.
- 6 bar is the common 87 psi shop line
- Check the tool’s flow rating too
- Set regulators below the tool maximum
Reading a European pump, boiler, hydraulic or HVAC datasheet in bar against a US installation quoted in psi — where the difference between gauge and absolute also matters.
- Confirm gauge or absolute first
- Watch for kg/cm² on older gear
- Save the PDF against the job file
7 tips for converting pressure without errors
The slips that quietly put a reading out by an atmosphere or two — and the checks that catch them.
PSI to bar FAQ
The conversion, tire, and gauge questions people ask most when a pressure is quoted in the unit they don’t use.
One bar is 14.503774 psi, and one psi is 0.0689476 bar. The bar is defined as exactly 100,000 pascals and the psi is defined from the pound-force and the square inch, so the relationship between them is an exact figure rather than an approximation.
For everyday work, 1 bar is close enough to 14.5 psi. That’s why a 2 bar tire reads as about 29 psi and a 2.2 bar tire reads as about 32 psi.
Divide the psi figure by 14.503774, or multiply it by 0.0689476. A 35 psi tire comes to 35 ÷ 14.503774 = 2.41 bar.
To go the other way, multiply bar by 14.503774. A 6 bar compressor setting is 6 × 14.503774 = 87 psi.
32 psi is 2.21 bar, or 220.6 kilopascals. It’s the most looked-up pressure conversion there is, because 32 psi is a common passenger car placard figure and most European tire gauges are marked in bar.
A gauge marked in 0.1 bar steps won’t hit 2.21 exactly, so 2.2 bar is the practical setting — that’s 31.9 psi, inside the tolerance of almost any tire gauge.
No, but they’re close. One standard atmosphere is 1.01325 bar, or 14.6959 psi, while one bar is 0.986923 atmospheres. The gap is about 1.3 percent.
At tire and compressor pressures that difference is irrelevant. At hydraulic or industrial pressures it isn’t: at 200 bar, the same 1.3 percent is more than 38 psi.
Psig is gauge pressure, measured relative to the surrounding air. Psia is absolute pressure, measured from a vacuum. Absolute is gauge plus atmospheric, so psia = psig + 14.7 at sea level.
Bar works the same way, written barg and bara, with an offset of 1.013 bar. Tire gauges, compressors and pressure washers all read gauge pressure — which is why a flat tire reads 0 psig while still holding 14.7 psia inside.
2.5 bar is 36.3 psi. The common European settings convert as 2.0 bar = 29 psi, 2.2 bar = 32 psi, 2.5 bar = 36 psi, and 2.8 bar = 41 psi.
Always set tires cold, before driving. Pressure rises roughly 1 psi — about 0.07 bar — for every 10°F of temperature increase, so a warm tire reads high.
Because bar sits neatly alongside the metric system. One bar is exactly 100 kPa and is very close to atmospheric pressure at sea level, which makes it an easy working unit even though the official SI unit is the pascal.
The psi survives in the United States and in parts of the oil, gas and aviation industries. Most pressure gauges sold today print both scales on the dial for exactly this reason.
They’re close but not equal. One kilogram-force per square centimetre is 0.980665 bar, or 14.223 psi — about 2 percent below a bar.
Older gauges and machinery from Europe and Asia are often marked in kg/cm², and treating those figures as bar introduces a small error. Harmless on a tire, worth correcting on a hydraulic system.
Reference Conversion Only — Check Gauge vs Absolute: This converter changes the pressure you enter between psi, bar and related units using exact conversion factors (1 bar = 100,000 Pa = 14.503774 psi). It does not distinguish between gauge pressure (psig, barg) and absolute pressure (psia, bara); confirm which your source uses before relying on a figure, as the two differ by one atmosphere. Tire pressures, tool ratings, and equipment pressures shown on this page are typical published values that vary by model, load and manufacturer — always follow the vehicle placard, sidewall maximum, or manufacturer specification rather than a general chart. Pressure equipment can be dangerous when over-pressurised; never exceed a rated working pressure. For reference purposes only.