100 Torr to psi — 100 torr in pounds per square inch
Exact 100 ÷ 51.714933 = 1.933677
100 torr in other units
| Pascals | 13,332.24 | Pa |
|---|---|---|
| Hectopascals | 133.322368 | hPa |
| Kilopascals | 13.332237 | kPa |
| Megapascals | 0.01333224 | MPa |
| Millibars | 133.322368 | mbar |
| Bar | 0.13332237 | bar |
| Standard atmospheres | 0.13157895 | atm |
| Pounds per square inch | 1.933677 | psi |
| Millimetres of mercury | 99.999986 | mmHg |
| Inches of mercury | 3.937007 | inHg |
Torr to psi at a glance
| Torr | Pounds per square inch |
|---|---|
| 1 Torr | 0.01933677 psi |
| 2 Torr | 0.03867355 psi |
| 3 Torr | 0.05801032 psi |
| 5 Torr | 0.09668387 psi |
| 10 Torr | 0.19336775 psi |
| 20 Torr | 0.38673549 psi |
| 25 Torr | 0.48341937 psi |
| 50 Torr | 0.96683874 psi |
| 100 Torr | 1.933677 psi |
| 250 Torr | 4.834194 psi |
| 500 Torr | 9.668387 psi |
| 1,000 Torr | 19.336775 psi |
How to convert torr to pounds per square inch
Multiply by 0.01933677 — one torr is 0.01933677 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 100 ÷ 51.714933 = 1.933677
In words: about two pounds per square inch.
What these units are
The torr and the pound per square inch are covered in the pressure unit guide, along with every other unit on this page.
Questions
How many pounds per square inch are in a torr?
One torr is 0.01933677 pounds per square inch. This figure is exact — it comes from the definition of the unit, not a measurement.
What is 100 torr in pounds per square inch?
100 torr is 1.933677 pounds per square inch. The working is 100 ÷ 51.714933 = 1.933677.
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.