Example 1
2.2 bar -> 31.9083 psi.
Bar to psi
Type the number from a gauge or a tire sidewall and pick bar or psi. This formula uses the pascal constant: 2.2 bar is about 31.91 psi. It does not add atmosphere, because it converts what you see on the scale.
The number on the gauge, with no atmosphere added. Temperature: Celsius and Fahrenheit.
Result
Enter a value. The result shows up here.
How it works
A bar is 100,000 pascals. Psi is pound-force per square inch, about 6,894.757 Pa. The quotient is 14.5038 psi per bar. On the page, 2.2 bar on a car tire sidewall is 31.9083 psi, usually rounded to 31.91. One bar back is 14.5038 psi, and 14.5 psi is already 0.9997 bar.
At a station compressor the scale is often in psi, while the door sticker and the sidewall are in bar. Type 2.2 and leave bar when that is what the tire says. 32 psi from a US manual is 2.2063 bar, not a magic 2.2. A road bike at 8 bar is 116.0302 psi. 2.5 bar is 36.2594 psi, 35 psi from a manual is 2.4132 bar, and half a bar is 7.2519 psi.
Pick the direction from the list: bar to psi or psi to bar. A comma and a period both parse. Typed zero gives zero. A minus is rejected, even if a vacuum gauge can read below zero. The header switch sets the start on an empty field and does not convert a number you already typed.
Tire or oven temperature lives on the Celsius and Fahrenheit page. Here it stays the pressure pair. Convert pascals to bar or psi first, because this calculator only knows those two units.
A tire gauge shows gauge pressure. The page does not add 14.7 psi and does not ask for psia. Technical atmosphere and atm, about 1.013 bar, use other constants. Work psig and psia in your head if you really need them.
A 14.5 or 32 label is a rounding. Take the sidewall or the door sticker, not this page as a pressure prescription.
How to use
- Type the number from a gauge or a tire sidewall, for example 2.2.
- Pick bar to psi or psi to bar, matching the scale you have.
- Click Calculate. 2.2 bar gives 31.9083 psi, about 31.91 as a shortcut.
- 1 bar is 14.5038 psi. Do not add atmosphere: that is not this scale.
- For temperature, open Celsius and Fahrenheit. Here it stays pressure.
Formula
psi = bar × (100,000 / 6894.757293168361)
bar = psi / 14.50377377
1 bar = 100,000 Pa. atm and at use other constants, not this quotient.
bar and psi on the gauge
Here 2.2 bar is about 31.91 psi. The constant comes from pascals: 1 bar = 100,000 Pa. The calculator does not add atmospheres.
- bar
- 100,000 Pa on a tire or boiler scale. 2.2 bar × (100000 / 6894.757…) ≈ 31.91 psi. Typed 1 bar is about 14.50 psi.
- psi
- Pounds per square inch, the US scale. 31.91 from 2.2 bar. The other way, psi / 14.50377377 returns bar. atm and at use other constants.
Real-life examples
Example 2
32 psi on a sidewall -> 2.2063 bar.
Example 3
1 bar -> 14.5038 psi on the gauge.
Example 4
2.5 bar -> 36.2594 psi.
Example 5
35 psi from a manual -> 2.4132 bar.
Example 6
8 bar -> 116.0302 psi.
Example 7
0.5 bar -> 7.2519 psi.
Example 8
14.5 psi -> 0.9997 bar.
Ways to use this converter
- You convert 2.2 bar from a tire when the station compressor is marked in psi.
- You check 32 psi from a US manual against a bar gauge before you inflate the wheel.
Frequently asked questions
Is bar here gauge or absolute?
It is just a number. A tire gauge usually shows gauge pressure. The page does not add atmosphere or ask for psia.
How many psi is exactly one bar?
100,000 Pa divided by 6,894.757293, about 14.5038 psi. A 14.5 label is a rounding.
Do you convert negative bar?
Zero is allowed and gives zero psi. A minus is treated as a typing error, even if a vacuum gauge can read below zero.
What does the header switch do?
On an empty field, metric sets bar and US sets psi. It does not rewrite a number you already typed.
How many bar is a typical car tire?
Often about 2.2 bar, which is 31.9083 psi. Take the sidewall or the door sticker.
Is 32 psi exactly 2.2 bar?
32 psi is 2.2063 bar. 2.2 bar is 31.9083 psi. Sidewalls often round to 32.
Is this psi or psig?
Psi as a unit. psig is a gauge reading. psia adds atmosphere. The page does not add 14.7 psi.
Road bike 8 bar in psi?
116.0302 psi. Check the tire limit. The converter does not judge whether 8 bar is safe.
Is 14.5 psi one bar going back?
14.5 psi is 0.9997 bar. To four decimals, 1 bar is 14.5038 psi.
How many psi are 2.5 bar and 0.5 bar?
2.5 bar is 36.2594 psi. 0.5 bar is 7.2519 psi. 35 psi back is 2.4132 bar.
Knowledge sources
The converter multiplies your number by an SI factor. NIST SP 330 and BIPM define the units, not your reading.
Page updated in 2026.