Convert bar to psi
Convert bar to psi instantly. 1 bar = 14.503774 psi. Formula, worked examples and a quick reference table.
Last updated
One bar equals 14.503774 psi. To convert any number of bars to psi, multiply by 14.50377377.
The converter above works in both directions and updates as you type. Below you will find the formula, a worked example and a reference table of common values.
Pressure conversions are dominated by one everyday task: inflating a tyre. The United States and the United Kingdom quote psi, most of Europe uses bar, Canada and Australia use kilopascals, and the figure on the door jamb may not match the unit on the gauge. Beyond tyres, the same conversions serve weather reporting, diving, and any engineering work where a specification and an instrument were made in different markets.
bar to psi formula
To go the other way, use bar = psi ÷ 14.50377377.
About these units
One bar is 100,000 pascals, very close to average atmospheric pressure at sea level — which is why it was chosen.
Pounds per square inch remains the standard for tyre pressure in the US and UK, while most of the world uses bar or kilopascals.
Bar is also written bars. PSI is also written pounds per square inch and lb/in2.
Sources
- Bureau International des Poids et Mesures, The International System of Units (SI), 9th edition, 2019.
- National Bureau of Standards, "Refinement of Values for the Yard and the Pound", Federal Register, 1 July 1959 — the international yard as exactly 0.9144 m and the avoirdupois pound as exactly 0.45359237 kg.
- NIST Special Publication 811, Guide for the Use of the International System of Units (SI), 2008 edition — conversion factors for units outside the SI.
bar to psi conversion table
| Bar | PSI |
|---|---|
| 1 bar | 14.5038 psi |
| 2 bar | 29.0075 psi |
| 3 bar | 43.5113 psi |
| 5 bar | 72.5189 psi |
| 10 bar | 145.0377 psi |
| 20 bar | 290.0755 psi |
| 25 bar | 362.5943 psi |
| 50 bar | 725.1887 psi |
| 100 bar | 1,450.3774 psi |
| 250 bar | 3,625.9434 psi |
| 500 bar | 7,251.8869 psi |
| 1,000 bar | 14,503.7738 psi |
Frequently asked questions
How many psi are in a bar? +
There are 14.503774 psi in one bar.
What is 10 bar in psi? +
10 bar equals 145.0377 psi. Multiply 10 by 14.50377377.
How do I convert psi back to bar? +
Use bar = psi ÷ 14.50377377. The converter above handles both directions, or see our dedicated psi to bar page.
How accurate is this bar to psi conversion? +
The factor used is 14.503773773, carried at full double precision. Where a unit has an exact legal definition the factor is exact rather than approximate. Rounding is applied only to the displayed result, so the answer is never a calculation done on an already-rounded number.
Is there a quick way to estimate bar to psi in my head? +
Multiply by 29 and divide by 2. That approximates the true factor of 14.503774 exactly, which is close enough for a mental estimate.