How to convert bar to pounds per square inch
One bar equals 14.5038 pounds per square inch, so multiply the number of bar by 14.5038:
psi = bar × 14.5038
bar = psi ÷ 14.5038 (1 psi = 0.068948 bar)
Example: 2.2 bar → 2.2 × 14.5038 = 31.9083 psi.
Going the other way, divide by 14.5038, or multiply by 0.068948; the pounds per square inch to bar converter does it for you.
Everyday values
| Bar | Pounds per square inch | For example |
|---|---|---|
| 1 bar | 14.5038 psi | atmospheric pressure, roughly |
| 2.2 bar | 31.9083 psi | a typical car tyre |
| 2.5 bar | 36.2594 psi | a loaded car tyre |
| 3 bar | 43.5113 psi | a compressor's low setting |
| 8 bar | 116.03 psi | a home air compressor |
| 200 bar | 2,900.75 psi | a scuba tank |
When you need this conversion
Bar is used on European tyre gauges, compressors, espresso machines (about 9 bar at the brew head) and scuba tanks (200–300 bar). One bar is very close to atmospheric pressure at sea level (1.013 bar).
Bar to pound per square inch conversion table
| bar | psi | bar | psi |
|---|---|---|---|
| 0.5 bar | 7.2519 psi | 5.5 bar | 79.7708 psi |
| 1 bar | 14.5038 psi | 6 bar | 87.0226 psi |
| 1.5 bar | 21.7557 psi | 6.5 bar | 94.2745 psi |
| 2 bar | 29.0075 psi | 7 bar | 101.526 psi |
| 2.5 bar | 36.2594 psi | 7.5 bar | 108.778 psi |
| 3 bar | 43.5113 psi | 8 bar | 116.03 psi |
| 3.5 bar | 50.7632 psi | 8.5 bar | 123.282 psi |
| 4 bar | 58.0151 psi | 9 bar | 130.534 psi |
| 4.5 bar | 65.267 psi | 9.5 bar | 137.786 psi |
| 5 bar | 72.5189 psi | 10 bar | 145.038 psi |
About the units
- Bar (bar): exactly 100,000 pascals, close to atmospheric pressure at sea level.
- Pound per square inch (psi): one pound-force on one square inch, about 6,894.76 Pa.
Both are units of pressure. The conversion factor comes from the exact definitions above, so the calculator is exact; results are only rounded for display (up to six significant digits).
Frequently asked questions
How many pounds per square inch are in one bar?
One bar is 14.5038 pounds per square inch. One pound per square inch is 0.068948 bar.
How do I convert bar to pounds per square inch?
Multiply the value in bar by 14.5038. To go back, divide by 14.5038.
What is 2.2 bar in pounds per square inch?
2.2 bar = 31.9083 psi.
What is 2.5 bar in pounds per square inch?
2.5 bar = 36.2594 psi.
Sources
- NIST Special Publication 811 (2008), Guide for the Use of the International System of Units (SI), Appendix B: conversion factors.
- NIST Handbook 44 (2024), Appendix C: General tables of units of measurement.
Last reviewed 5 October 2026. Results are estimates; see our disclaimer.