PSI to Bar Converter
Convert pounds per square inch to bar (psi to bar) for tires, compressors and gauges
1 psi = 0.0689476 bar. To convert psi to bar, divide the psi value by 14.50377 (or multiply by 0.0689476), so a 32 psi tire is 2.206 bar.
PSI to Bar converter
Live- 2.0360205 inHg
- 6.8947573 kPa
- 0.068045964 atm
- 51.714925 mmHg
- 51.714933 Torr
How to convert psi to bar
Both units are fixed amounts of pascals. One psi (pound-force per square inch) is 6,894.757 Pa, the force of one pound-force spread over one square inch. One bar is exactly 100,000 Pa, a round metric value chosen to sit close to sea-level air pressure. Dividing one by the other gives the fixed ratio: 1 bar = 14.503774 psi, and 1 psi = 0.06894757 bar. The bar to psi converter applies the same ratio in reverse, and the pressure converter sets psi beside kPa, atmospheres, Torr and mercury units.
The main trap is not the arithmetic but the reference point. Tire gauges, compressors and pressure washers show gauge pressure, the pressure above the surrounding air. Converting psi to bar keeps the same reference, so 35 psig becomes 2.413 barg, never 3.426 bar. For placards in kilopascals, the psi to kPa converter is one step shorter.
Step by step
- Read the pressure in psi from your gauge, placard or spec sheet.
- Divide it by 14.50377 (or multiply by 0.0689476).
- Round to two decimals for tires, one decimal for compressors.
- Keep gauge readings as gauge (barg) and absolute readings as absolute (bara).
See it on a scale
Worked examples
A typical car tire placard, a common air compressor cut-out pressure and a full aluminum scuba cylinder.
32 psi × 0.0689475729 = 2.2063223 bar
= 2.2063223 bar
100 psi × 0.0689475729 = 6.8947573 bar
= 6.8947573 bar
3,000 psi × 0.0689475729 = 206.84272 bar
= 206.84272 bar
How do I convert psi to bar in Excel or Google Sheets?
With the psi value in cell A2, enter =A2/14.5037738 or =A2*0.0689475729 to get bar. Both use the exact ratio, so they agree to at least eight significant figures in Excel and Google Sheets alike.
Drag the formula down a column to convert a whole list at once. Round only the cells you print: =ROUND(A2/14.5037738,2) shows 2.21 for 32 psi, the two decimals most metric tire placards use. To turn a bar column back into psi, the formula is =A2*14.5037738. In Google Sheets, =ARRAYFORMULA(A2:A50/14.5037738) fills a whole column from one cell, and current versions of Excel spill the plain =A2:A50/14.5037738 the same way.
| A2 (psi) | Formula | Result (bar) |
|---|---|---|
| 32 | =A2/14.5037738 | 2.2063 |
| 90 | =A2/14.5037738 | 6.2053 |
| 150 | =A2/14.5037738 | 10.3421 |
| 3,000 | =A2/14.5037738 | 206.84 |
If a sheet mixes gauge and absolute readings, convert everything with the plain formula first and add 1.01325 bar only where you need an absolute value, for example =A2/14.5037738+1.01325 for a sea-level psia figure.
Why is 14.7 psi not the same as 1 bar?
Because 14.7 psi is one standard atmosphere (14.6959 psi, or 1.01325 bar), while 1 bar is exactly 100,000 Pa, which is 14.5038 psi. The atmosphere is 1.325% larger than the bar, so the two numbers look interchangeable but are not.
The two references were set for different reasons. The standard atmosphere of 101,325 Pa was adopted by the 10th CGPM in 1954 as a representative sea-level air pressure. The bar is a round power of ten in SI terms, 10⁵ Pa, which happens to land just below it. Dividing a psi figure by the wrong one shifts every answer by about 1.3%:
| Pressure | ÷ 14.5038 (bar) | ÷ 14.6959 (atm) |
|---|---|---|
| 32 psi | 2.2063 | 2.1775 |
| 100 psi | 6.8948 | 6.8046 |
| 3,000 psi | 206.84 | 204.14 |
The answer in atmospheres is always the smaller one. On a car tire the two results differ by only about 0.03, well inside gauge accuracy, but on a 3,000 psi cylinder they differ by about 2.7, which is why dive and industrial work should never use 14.7 as a bar factor.
PSI to bar conversion chart
Every whole psi value from 28 to 36 is included because that is where most car placards fall, plus compressor and cylinder pressures. Values are rounded to three decimals from the exact factor.
| PSI (psi) | Bar (bar) |
|---|---|
| 1 psi | 0.069 bar |
| 2 psi | 0.138 bar |
| 5 psi | 0.345 bar |
| 10 psi | 0.689 bar |
| 14.5 psi | 1 bar |
| 15 psi | 1.034 bar |
| 20 psi | 1.379 bar |
| 22 psi | 1.517 bar |
| 24 psi | 1.655 bar |
| 26 psi | 1.793 bar |
| 28 psi | 1.931 bar |
| 29 psi | 1.999 bar |
| 30 psi | 2.068 bar |
| 31 psi | 2.137 bar |
| 32 psi | 2.206 bar |
| 33 psi | 2.275 bar |
| 34 psi | 2.344 bar |
| 35 psi | 2.413 bar |
| 36 psi | 2.482 bar |
| 38 psi | 2.62 bar |
| 40 psi | 2.758 bar |
| 42 psi | 2.896 bar |
| 44 psi | 3.034 bar |
| 45 psi | 3.103 bar |
| 50 psi | 3.447 bar |
| 55 psi | 3.792 bar |
| 60 psi | 4.137 bar |
| 65 psi | 4.482 bar |
| 70 psi | 4.826 bar |
| 80 psi | 5.516 bar |
| 90 psi | 6.205 bar |
| 100 psi | 6.895 bar |
| 110 psi | 7.584 bar |
| 120 psi | 8.274 bar |
| 125 psi | 8.618 bar |
| 150 psi | 10.342 bar |
| 175 psi | 12.066 bar |
| 200 psi | 13.79 bar |
| 3,000 psi | 206.843 bar |
PSI vs bar: what is the difference?
Both units measure pressure, a force spread over an area, but the psi is built from US customary force and area units while the bar is a round multiple of the SI pascal.
| Attribute | PSI | Bar |
|---|---|---|
| Symbol | psi | bar |
| System | Imperial / US | Metric (non-SI) |
| Defined as | 6,894.757 Pa | 100,000 Pa |
| One unit equals | 0.068947573 bar | 14.503774 psi |
| What it is built from | One pound-force on one square inch (lbf/in²) | 100,000 newtons on one square meter (10⁵ Pa) |
| Reference suffixes | psig (gauge), psia (absolute), psid (differential) | barg (gauge), bara (absolute) |
| Where it is used | US tire gauges, compressors, plumbing, hydraulics and pressure washers | European tire placards, espresso machines, dive cylinders and process plants |
| Typical car tire placard (gauge) | 32 psi | 2.21 bar |
| Documented in | NIST SP 811, from the pound-force and inch of the 1959 agreement | NIST SP 811 as exactly 10⁵ Pa; outside the SI |
5 key differences
- A bar is 14.504 times larger than a psi, so the same pressure always reads as a much smaller number in bar.
- The bar is a round decimal multiple of the pascal, while the psi works out to 6,894.757 Pa because it inherits the pound-force and the square inch.
- Psi placards use whole numbers such as 32 or 35, while bar placards need one or two decimals, such as 2.2 or 2.4, to carry the same precision.
- One graduation of 0.1 bar on a metric gauge spans 1.45 psi, so a bar gauge marked in tenths is coarser than a psi gauge marked in single units.
- Neither unit belongs to the SI; both are defined as fixed numbers of pascals, the SI unit of pressure.
Tire pressure chart for cars, pickups and trucks: psi to bar
Typical cold inflation ranges, shown as gauge pressure. The correct figure for your vehicle is on the door-jamb placard or in the owner's manual, not on the tire sidewall, which lists the maximum. Placards set in kPa convert cleanly with the psi to kPa converter.
| Vehicle | Typical psi | Bar | kPa |
|---|---|---|---|
| Compact and midsize cars | 30–35 psi | 2.07–2.41 bar | 207–241 kPa |
| SUVs and crossovers | 32–38 psi | 2.21–2.62 bar | 221–262 kPa |
| Half-ton pickups (P-metric tires) | 35–40 psi | 2.41–2.76 bar | 241–276 kPa |
| Heavy-duty pickups, LT tires (rear, loaded) | 50–80 psi | 3.45–5.52 bar | 345–552 kPa |
| Temporary spare (T-type) | 60 psi | 4.14 bar | 414 kPa |
| Motorcycles | 28–42 psi | 1.93–2.9 bar | 193–290 kPa |
| Semi-truck steer and drive tires | 100–120 psi | 6.89–8.27 bar | 689–827 kPa |
Bicycle tire pressure: psi to bar by bike type
Bike pressures depend on tire width, rider weight and terrain, so treat these as starting points. Many bike pumps and sidewalls print both scales. If you run hookless rims, the rim standard caps pressure at 5 bar (72.5 psi) regardless of the tire.
| Bike and tire | Typical psi | Bar |
|---|---|---|
| Fat bike (4–5 in tires) | 5–15 psi | 0.34–1.03 bar |
| Mountain bike, tubeless (2.2–2.6 in) | 20–30 psi | 1.38–2.07 bar |
| Gravel bike (35–45 mm) | 30–50 psi | 2.07–3.45 bar |
| Hybrid and commuter (32–40 mm) | 50–70 psi | 3.45–4.83 bar |
| Road bike (25–28 mm) | 70–100 psi | 4.83–6.89 bar |
| Track and time-trial (23 mm) | 100–130 psi | 6.89–8.96 bar |
What do psig, psia, barg and bara mean?
Psig and barg are gauge pressures, measured from the surrounding atmosphere, while psia and bara are absolute pressures, measured from a perfect vacuum. An open gauge therefore reads zero psig even though the air around it sits at about 14.696 psia, or 1.01325 bara, at sea level. A pressure value is only meaningful once you know which of the two it is.
A tire inflated to 32 psig therefore holds 2.2063 barg, which is about 46.7 psia or 3.22 bara. Converting units never changes the reference, so do the unit conversion first and add or subtract the atmosphere only when you actually need to change reference.
Which one you are looking at
- Gauge: tire placards, tire inflators, air compressors, pressure washers, hydraulic gauges, household water pressure.
- Absolute: barometric and weather readings, altitude calculations, vacuum work, engine MAP sensors and gas-law problems.
- Unlabeled: if a spec sheet says only "psi" or "bar" for equipment, it almost always means gauge.
Temperature matters too. A common rule of thumb is that tire pressure changes about 1 psi (roughly 0.07 bar) for every 10 °F change in air temperature, which is why placards specify cold tires. The Fahrenheit to Celsius converter helps if your weather forecast and your gauge disagree on units.
Air compressor, air tool and pressure washer ratings in bar
Typical ranges from US product ratings, converted to bar. Air tools list a working pressure at the tool inlet; compressors list the maximum tank pressure, which is always higher. Always stay at or below the lowest rating of any hose, fitting or tool in the line.
| Equipment | Typical rating | Bar |
|---|---|---|
| Airbrush | 15–30 psi | 1–2.1 bar |
| Framing and finish nailers | 70–120 psi | 4.8–8.3 bar |
| Impact wrench, ratchet, sander (at the tool) | 90 psi | 6.2 bar |
| Pancake or hot-dog compressor, tank maximum | 135–150 psi | 9.3–10.3 bar |
| Two-stage shop compressor, tank maximum | 175 psi | 12.1 bar |
| Electric pressure washer | 1,300–2,300 psi | 89.6–158.6 bar |
| Gas pressure washer | 2,500–3,300 psi | 172.4–227.5 bar |
| Commercial hot-water washer | 3,500–4,000 psi | 241.3–275.8 bar |
What mistakes do people make converting psi to bar?
The usual slips are dividing by 14.7 instead of 14.5, mixing gauge with absolute pressure, reading millibar as bar and inflating to the sidewall number instead of the placard.
- Using 14.7 instead of 14.5. 14.7 is psi per atmosphere, not per bar. Dividing 32 by 14.7 gives 2.177, which is atmospheres.
- Mixing gauge and absolute. Adding 14.7 before converting a tire pressure turns a gauge reading into an absolute one and gives a result about 1 bar too high.
- Reading millibar as bar. Weather maps use millibar (hectopascals); 1,013 mbar is 1.013 bar, not 1,013 bar.
- Setting pressure from the sidewall. The number molded on the tire is the maximum it can hold, not the recommended pressure for your vehicle.
For a fast estimate that avoids the first slip, divide psi by 14.5. That gives 2.207 bar for 32 psi against the exact 2.206 bar, an error below 0.03%. Dividing by 15 is easier but reads about 3% low, which is enough to under-inflate a tire by a full psi.
When you also need to torque the wheel nuts after a tire change, the ft-lbs to Nm converter handles European torque specs. Every other pressure unit is on the pressure converter.
Sources and further reading
The standards and references behind the numbers on this page. Links open in a new tab.
Standards and official sources
PSI to bar FAQs
Short, exact answers to what people ask most.
What is 32 psi in bar?
32 psi is 2.2063 bar, usually rounded to 2.2 bar. It is one of the most common passenger-car tire pressures and equals 220.6 kPa.
What is 35 psi in bar?
35 psi is 2.4132 bar, or about 2.4 bar. That is a typical placard figure for many crossovers and SUVs.
How many bar is 100 psi?
100 psi equals 6.8948 bar, just under 7 bar. It is a common working pressure for air compressors and road bike tires.
Is 2.2 bar the same as 32 psi?
Very nearly. 2.2 bar is 31.91 psi, so a 32 psi placard and a 2.2 bar placard differ by less than 0.1 psi, which is inside the accuracy of most tire gauges.
How do I convert psi to bar without a calculator?
Divide psi by 14.5. For example, 30 psi ÷ 14.5 ≈ 2.07 bar, and the exact answer is 2.0684 bar.
Does converting psi to bar change gauge to absolute pressure?
No. A gauge reading in psi converts to a gauge reading in bar. To get absolute pressure, add about 1.01325 bar at sea level after converting.
How many bar is 1 psi?
1 psi equals 0.0689476 bar, or about 0.069 bar. Put the other way, it takes 14.504 psi to make one bar.
What is 40 psi in bar?
40 psi is 2.7579 bar, about 2.76 bar. Many SUV and light-truck placards sit near this figure, but the placard on your own door jamb is the one to follow.
What is 150 psi in bar?
150 psi equals 10.342 bar. That is a typical maximum tank pressure for small pancake and hot-dog air compressors.
How many bar is 3,000 psi?
3,000 psi is 206.84 bar. It is the service pressure of the common aluminum 80 scuba cylinder, which divers elsewhere would call a 207 bar fill.
Related conversions
Conversion factors from NIST SP 811 (2008) for the pound-force per square inch and the bar, the BIPM SI Brochure (9th ed.) for the pascal, and the 10th CGPM (1954) for the standard atmosphere; the 5 bar hookless rim limit is from the ETRTO and ISO bicycle rim standards. Last updated . How we verify our numbers.