Unit converter
Pressure.
Convert psi to bar, or pick any of the 17 units in the menus. Type in either box and the other follows. Tyres, weather, diving and vacuum work each have their own favourite unit, and the standard atmosphere is a defined constant rather than today's weather.
| psi | bar |
|---|---|
| 1 psi | 0.0689476 bar |
| 2 psi | 0.137895 bar |
| 3 psi | 0.206843 bar |
| 4 psi | 0.27579 bar |
| 5 psi | 0.344738 bar |
| 10 psi | 0.689476 bar |
| 15 psi | 1.03421 bar |
| 20 psi | 1.37895 bar |
| 25 psi | 1.72369 bar |
| 50 psi | 3.44738 bar |
| 75 psi | 5.17107 bar |
| 100 psi | 6.89476 bar |
| 250 psi | 17.2369 bar |
| 500 psi | 34.4738 bar |
| 1000 psi | 68.9476 bar |
- Every unit in the menus is defined against Pa, so any pairing converts by the same single route.
Definitions
- The pound per square inch is exactly 6894.757 293 Pa. UK and US tyre gauges are still marked in it.
- The bar is exactly 100 000 Pa, near enough to atmospheric pressure at sea level to be a convenient working unit.
- Every unit here is defined against the Pa.
- 13 of the 17 units are exact by definition; the rest are conventional or measured values. The display says which kind you are looking at.
How it works
Every value is converted into pascals and then back out into the unit you asked for. One route covers every pairing in the menus, so an unusual combination is no less accurate than a common one, and adding a unit affects only that unit.
Both boxes are live. Whichever one you last typed in is the source, changing either menu recalculates straight away, and Swap exchanges the units and the values so the number you are reading stays where you are looking.
Display precision sets a maximum number of significant figures and trims trailing zeroes, so it changes what you see and never what was calculated. The editable box always holds a plain number at full working precision, so you can carry on from either side.
Common questions this answers: how many bars in a pound per square inch (0.0689476), how many pounds per square inch in a bar (14.5038), and what 32 psi is in bars (2.20632 bar).
Common conversions
- Free
- No ads
- No tracking
- No account
- Works offline once loaded
From the maker of Ans — a scientific calculator you can own. Same idea: a proper instrument, nothing in the way.