12 bar to psi — 12 bar in pounds per square inch
Exact 12 × 14.503774 = 174.045285
12 bar in other units
| Pascals | 1,200,000 | Pa |
|---|---|---|
| Hectopascals | 12,000 | hPa |
| Kilopascals | 1,200 | kPa |
| Megapascals | 1.2 | MPa |
| Millibars | 12,000 | mbar |
| Standard atmospheres | 11.843079 | atm |
| Pounds per square inch | 174.045285 | psi |
| Torr | 9,000.74 | Torr |
| Millimetres of mercury | 9,000.74 | mmHg |
| Inches of mercury | 354.3598 | inHg |
bar to psi at a glance
| Bar | Pounds per square inch |
|---|---|
| 1 bar | 14.503774 psi |
| 2 bar | 29.007548 psi |
| 3 bar | 43.511321 psi |
| 5 bar | 72.518869 psi |
| 10 bar | 145.037738 psi |
| 20 bar | 290.075475 psi |
| 25 bar | 362.594344 psi |
| 50 bar | 725.188689 psi |
| 100 bar | 1,450.38 psi |
| 250 bar | 3,625.94 psi |
| 500 bar | 7,251.89 psi |
| 1,000 bar | 14,503.77 psi |
How to convert bar to pounds per square inch
Multiply by 14.503774 — one bar is 14.503774 pounds per square inch. That factor is exact: it comes from the definition of the units rather than from a measurement, so it will not change and does not need rounding.
Working 12 × 14.503774 = 174.045285
In words: about one hundred seventy-four pounds per square inch.
Questions
How many pounds per square inch are in a bar?
One bar is 14.503774 pounds per square inch. This figure is exact — it comes from the definition of the unit, not a measurement.
What is 12 bar in pounds per square inch?
12 bar is 174.045285 pounds per square inch. The working is 12 × 14.503774 = 174.045285.
What pressure should my tyres be?
Look at the sticker in the driver's door frame or the fuel flap, not the number moulded into the tyre — that one is the tyre's maximum, not the manufacturer's recommendation. Most cars sit somewhere around 32 to 35 psi, which is roughly 2.2 to 2.4 bar.
Is my tyre gauge measuring absolute or gauge pressure?
Gauge pressure — the amount above the surrounding air. A tyre reading 32 psi actually contains about 46.7 psi absolute, because atmospheric pressure of roughly 14.7 psi is already pressing on the other side of the gauge. Conversions on this page are between units, and leave that distinction alone.
Why do weather forecasts use hectopascals and millibars interchangeably?
Because they are the same size. One hectopascal is exactly one millibar, so the change from mbar to hPa was a relabelling rather than a conversion. Standard sea-level pressure is 1013.25 of either.
What is the difference between torr and mmHg?
Almost nothing, and the difference is deliberate. A torr is exactly one seven-hundred-and-sixtieth of a standard atmosphere; the conventional mmHg is defined as exactly 133.322387415 pascals. They diverge by about one part in seven million — invisible in medicine, occasionally not in vacuum work.