Example 1
- Bar field: 2.2
31.9083 psi
A common passenger tire mark. In kPa: 220 kPa.
Bar to PSI Calculator
Enter pressure in bar or psi — the other field fills in automatically. SI formula: psi = bar × (100,000 / 6,894.757293), about 14.5038 psi per bar. At 2.2 bar the result is 31.9083 psi; at 32 psi it is 2.2063 bar. A kPa equivalent is shown too. The calculator does not add atmospheric pressure and does not convert the reading to psia.
One field for a metric sticker in bar, the other for a psi reading. Temperature: Celsius and Fahrenheit. Power: kW to hp.
How the result is calculated
Pressure2.2 bar
Constant14.5038
Result31.9083 psi
This calculator converts pressure between bar and psi using the SI definitions. One bar is exactly 100,000 pascals, and one psi is 6,894.757293 Pa. So psi = bar × (100,000 / 6,894.757293), about 14.5038 psi per bar. The other way, divide by the same constant. The result shows four decimal places. At 2.2 bar: 2.2 × 14.5038 ≈ 31.9083 psi. At 1 bar the result is 14.5038 psi.
A station compressor often reads in psi, while a European door sticker or tire sidewall uses bar. Enter 2.2 in the Bar field when that is what the sticker says; the Psi field fills in automatically. 32 psi from a U.S. guide is 2.2063 bar, not exactly 2.2. For scale: 8 bar on a road bike is 116.0302 psi, 2.5 bar is 36.2594 psi, and 35 psi is 2.4132 bar.
Both fields work together: change the unit you have in front of you. A preset button or a table row fills the same fields. A comma and a period mean the same fraction. Zero is allowed; a negative value is not. The kPa line is the same reading on the SI scale: 1 bar = 100 kPa.
A tire gauge shows pressure above atmosphere. The calculator does not add 14.7 psi and does not convert to absolute pressure (psia). Technical atmosphere and atm use their own constants. Always take the target pressure from your sidewall or the door-jamb sticker on your car.
How to use
- Enter a number in Bar when you have a metric sticker, or in Psi when you read a U.S. compressor.
- The other field and the gauge update right away. You can also choose a preset such as 32 psi.
- At 2.2 bar the result is 31.9083 psi (about 32 on a typical dial). At 32 psi the result is 2.2063 bar.
- A row in the tire table fills the same fields. Always take the target pressure from the door jamb or sidewall.
- The kPa line is the same SI reading. The calculator does not add atmosphere.
Formula
Conversion through SI pascals: 1 bar = 100,000 Pa, 1 psi = 6,894.757293 Pa.
psi = bar × (100,000 / 6,894.757293)
bar = psi ÷ (100,000 / 6,894.757293)
The result is rounded to four decimal places. 1 bar ≈ 14.5038 psi. 1 bar = 100 kPa.
bar, psi, and kPa on the gauge
2.2 bar is 31.9083 psi. The constant comes from the pascal definitions. The calculator does not add atmosphere.
- bar
- 100,000 Pa. 2.2 bar = 31.9083 psi. Use the Bar field for metric stickers.
- psi
- Pound-force per square inch. 1 bar ≈ 14.5038 psi. 32 psi = 2.2063 bar.
- kPa
- 1 bar = 100 kPa. The same reading on the SI scale, without an extra conversion.
- 14.5038
- 1 bar in psi on this page at four decimals. A “14.5” mark on a dial is a rounding.
Examples
Three examples from the same formula. The first two start from bar; the third from psi.
Example 2
- Bar field: 1
14.5038 psi
Exactly one pascal-based constant, shown to four decimal places.
Example 3
- Psi field: 32
2.2063 bar
32 psi is not exactly 2.2 bar (31.9083 psi).
Quick tire table
Tap a row to fill the fields. These are conversion examples, not manufacturer specs.
Related calculators
Frequently asked questions
What does this calculator compute?
It converts pressure between bar and psi. Formula: psi = bar × (100,000 / 6,894.757293) and bar = psi ÷ the same constant. At 2.2 bar the result is 31.9083 psi. It also shows the equivalent in kPa. It does not add atmospheric pressure.
Where does about 14.5038 psi per bar come from?
1 bar is exactly 100,000 Pa. 1 psi is 6,894.757293 Pa. Dividing those values gives about 14.5038 psi per bar. A “14.5” mark on a gauge is a rounding.
Is bar here gauge pressure or absolute?
It is simply the number on the gauge. A tire gauge usually shows gauge pressure. The calculator does not add atmosphere or convert to psia.
How do the two bar and psi fields work?
Enter the number in the field that matches what you are looking at. The other field and the gauge update automatically with the same SI constant. There is no direction menu.
Can pressure be negative?
No. Zero is allowed and still converts to zero. A negative value is rejected, even if a vacuum gauge can read below zero.
Is 32 psi exactly 2.2 bar?
No. 32 psi is 2.2063 bar. 2.2 bar is 31.9083 psi. Sidewalls often round to 32.
How do psi, psig, and psia differ?
Psi is the unit. The psig label is a gauge reading relative to atmosphere. The psia label includes atmosphere. This page does not add 14.7 psi.
What is the kPa result for?
1 bar is exactly 100 kPa. The kPa line is the same reading on the SI scale, not a second conversion. It is not a separate sticker value.
Does a decimal comma work in the pressure field?
Yes. A comma and a period both mean the same fraction. 2.2 bar works the same as 2,2.
Does the result replace the door sticker?
No. Take the pressure from your tire sidewall or the door sticker on your car. The calculator only converts units.
How many psi are 1 bar and 2 bar?
One bar is about 14.5038 psi. Two bar is about 29.0075 psi. The constant is 100,000 Pa divided by 6,894.757293 Pa.
How many bars are 30 psi and 35 psi?
Thirty psi is about 2.0684 bar. Thirty-five psi is about 2.4133 bar. Divide psi by the same constant ≈ 14.5038.
How many kPa is 2.2 bar?
Exactly 220 kPa, because 1 bar = 100 kPa. The kPa line is the same reading on the SI scale, not a second placard value.
Is 2.5 bar the right tire pressure?
The calculator only converts units. Take the target pressure from the door sticker or the sidewall of your own tire.
How does bar differ from atmosphere (atm)?
1 atm is 1.01325 bar. This page does not convert bar to atm and does not add 1 atm to a gauge reading.
Why four decimal places in the result?
The SI constant is not round. Four places show the gap between 2.2 bar (31.9083 psi) and a gauge rounded to 32 psi.
Knowledge sources
1 bar = 100,000 Pa. Psi is pound-force per square inch. NIST and BIPM publish the unit definitions.
Page updated November 3, 2026.