Psi to Bars
Type a value in either box to convert between psi and bars. The factor is 0.0689476.
| Psi | Bars |
|---|---|
| 1 psi | 0.068948 bar |
| 2 psi | 0.137895 bar |
| 3 psi | 0.206843 bar |
| 5 psi | 0.344738 bar |
| 10 psi | 0.689476 bar |
| 25 psi | 1.723689 bar |
| 50 psi | 3.447379 bar |
| 100 psi | 6.894757 bar |
How to use
- Enter a value in the Psi field.
- The Bars figure appears immediately — no button to press.
- Typing in the Bars field converts back to Psi the same way.
- Use the reference table for the values that come up most often.
Psi to Bars formula
To convert psi to bars, multiply by 0.0689475729.
bar = psi × 0.0689475729
Why this factor: the pound per square inch and the bar are both defined against the pascal, so dividing one definition by the other gives 0.0689475729 directly. Both definitions are set out in full below.
To go the other way, divide by 0.0689475729 — or use the Bars to Psi converter, which is the same calculation reversed.
Worked example
Take 760 psi and multiply by the factor 0.0689475729: the result is 52.400155 bar.
760 psi × 0.0689475729 = 52.400155 bar
The converter above does this for any value you type, in either direction.
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.
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%.
Psi vs Bars
The pound per square inch is a US customary unit while the bar is a metric 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 bars are in a pound per square inch?
One pound per square inch equals 0.0689475729 bars.
What is the formula to convert psi to bars?
Multiply the number of psi by 0.0689475729. To reverse it, divide by 0.0689475729 instead.
How do I convert bars back to psi?
Divide by 0.0689475729, which is the same as multiplying by 14.5037738.
How many bars are in 10 psi?
10 psi works out to 0.689476 bar.
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 pound per square inch defined?
One pound-force per square inch, which is about 6,894.757 pascals.