Bars to Psi
An instant bars-to-psi converter, with the formula and a reference table below.
| Bars | Psi |
|---|---|
| 1 bar | 14.503774 psi |
| 2 bar | 29.007548 psi |
| 3 bar | 43.511321 psi |
| 5 bar | 72.518869 psi |
| 10 bar | 145.037738 psi |
| 25 bar | 362.594344 psi |
| 50 bar | 725.188689 psi |
| 100 bar | 1450.377377 psi |
How to use
- Enter a value in the Bars field.
- The Psi figure appears immediately — no button to press.
- Typing in the Psi field converts back to Bars the same way.
- Use the reference table for the values that come up most often.
Bars to Psi formula
To convert bars to psi, multiply by 14.5037738.
psi = bar × 14.5037738
Why this factor: the bar and the pound per square inch are both defined against the pascal, so dividing one definition by the other gives 14.5037738 directly. Both definitions are set out in full below.
To go the other way, divide by 14.5037738 — or use the Psi to Bars converter, which is the same calculation reversed.
Worked example
Given 100 bar, multiplying by 14.5037738 yields 1450.377377 psi.
100 bar × 14.5037738 = 1450.377377 psi
The converter above does this for any value you type, in either direction.
What is a bar?
A bar is a metric pressure unit chosen to sit very close to atmospheric pressure.
Definition: Exactly 100,000 pascals by definition. Standard atmosphere is 1.01325 bar, so a bar is slightly less.
Where it is used: European tire and hydraulic pressures, diving depth equivalents, and espresso machine ratings.
Worth knowing: Close to one atmosphere but not equal to it — the difference is about 1.3%.
What is a pound per square inch?
Pounds per square inch is the standard pressure unit in the United States.
Definition: One pound-force per square inch, which is about 6,894.757 pascals.
Where it is used: US tire pressure, compressed air and hydraulic systems, and plumbing water pressure.
Bars vs Psi
The bar is a metric unit while the pound per square inch is a US customary unit. That is why the factor between them is not a round number: the two systems were defined independently and only later tied together by exact agreement.
Frequently asked questions
How many psi are in a bar?
One bar equals 14.5037738 psi.
What is the formula to convert bars to psi?
Multiply the number of bars by 14.5037738. To reverse it, divide by 14.5037738 instead.
How do I convert psi back to bars?
Divide by 14.5037738, which is the same as multiplying by 0.0689475729.
How many psi are in 10 bars?
10 bar works out to 145.037738 psi.
Is there anything to watch out for with bars?
Close to one atmosphere but not equal to it — the difference is about 1.3%.
How is the bar defined?
Exactly 100,000 pascals by definition. Standard atmosphere is 1.01325 bar, so a bar is slightly less.