PSI to Bar Converter
Type psi to get bar. A car tire at 32 psi is at about 2.2 bar.
32 psi =
2.2063bar
32 pounds per square inch is 2.2063 bar.
- 1 psi
- 0.06895 bar
- 1 bar
- 14.5038 psi
How to convert psi to bar
Divide the pressure in psi by 14.5038. A bar is 100,000 pascals and a psi is about 6,894.76 pascals, so one bar holds about 14.5 psi. The divisor is rounded to six figures; the converter above works from the exact definitions and gives the same answer to every digit it shows.
Worked through for a light-truck tire inflated to 45 psi: 45 ÷ 14.5038 = 3.103 bar. A pump or gauge marked in bar would show that as 3.1.
Both readings on a tire gauge are gauge pressure, meaning how far the air inside sits above the air outside. Nothing changes when you switch units, so 45 psi gauge becomes 3.1 bar gauge, not 3.1 bar absolute.
bar = pounds per square inch ÷ 14.5038 (rounded)
- NIST lists 1 pound-force per square inch as 6.894 757 kPa, from the pound (0.45359237 kg) and standard gravity (9.80665 m/s²) acting on one square inch. Source: NIST SP 811, Appendix B.8: conversion factors by unit.
- The bar is defined as exactly 100,000 Pa (100 kPa), slightly less than one standard atmosphere. Source: NIST SP 811, Appendix B.8: conversion factors by unit.
How to estimate psi to bar in your head
Divide by 15, then add a little. 30 psi ÷ 15 = 2, and the true figure is 2.07 bar. Dividing by 15 lands about 3% low, which on a tire is a tenth of a bar or less.
Even quicker for round numbers: 14.5 psi is almost exactly 1 bar and 29 psi almost exactly 2 bar, so count in steps of 14.5. A road bike at 100 psi is a shade under 7 bar (6.89).
PSI to bar chart
Tire, pump and compressor pressures, converted to bar to three decimals.
| Pounds per square inch (psi) | Bar (bar) | Typical use |
|---|---|---|
| 10 | 0.6895 | |
| 15 | 1.0342 | |
| 20 | 1.379 | |
| 25 | 1.7237 | |
| 28 | 1.9305 | |
| 30 | 2.0684 | |
| 32 | 2.2063 | many car tires |
| 33 | 2.2753 | |
| 35 | 2.4132 | |
| 36 | 2.4821 | many car tires (higher placard) |
Show all 21 rowsShow fewer
| 40 | 2.7579 | |
| 45 | 3.1026 | |
| 50 | 3.4474 | |
| 60 | 4.1369 | |
| 65 | 4.4816 | hybrid bike tire |
| 80 | 5.5158 | |
| 90 | 6.2053 | |
| 100 | 6.8948 | road bike tire |
| 110 | 7.5842 | |
| 120 | 8.2737 | |
| 150 | 10.3421 |
Frequently Asked Questions
What is 32 psi in bar?
32 psi is 2.206 bar. European tire placards would usually print that as 2.2 bar, so a car that asks for 32 psi in the US and 2.2 bar in Europe is asking for the same pressure.
Is psi the same as psig?
On a tire or compressor gauge, yes: “psig” spells out that it is gauge pressure, measured above the surrounding air. “psia” is absolute pressure, which adds about 14.7 psi of atmosphere at sea level. Convert psig to bar and you get bar gauge.
Why do bike pumps show both psi and bar?
Tire sidewalls are printed in both, because riders in the US work in psi and most of Europe in bar. The outer ring of the pump dial usually carries psi and the inner ring bar, with roughly 14.5 psi for every bar.