20 Torr to inHg — 20 torr in inches of mercury
Exact 20 ÷ 25.400004 = 0.78740146
20 torr in other units
| Pascals | 2,666.45 | Pa |
|---|---|---|
| Hectopascals | 26.664474 | hPa |
| Kilopascals | 2.666447 | kPa |
| Megapascals | 0.002666447368 | MPa |
| Millibars | 26.664474 | mbar |
| Bar | 0.02666447 | bar |
| Standard atmospheres | 0.02631579 | atm |
| Pounds per square inch | 0.38673549 | psi |
| Millimetres of mercury | 19.999997 | mmHg |
| Inches of mercury | 0.78740146 | inHg |
Torr to inHg at a glance
| Torr | Inches of mercury |
|---|---|
| 1 Torr | 0.03937007 inHg |
| 2 Torr | 0.07874015 inHg |
| 3 Torr | 0.11811022 inHg |
| 5 Torr | 0.19685037 inHg |
| 10 Torr | 0.39370073 inHg |
| 20 Torr | 0.78740146 inHg |
| 25 Torr | 0.98425183 inHg |
| 50 Torr | 1.968504 inHg |
| 100 Torr | 3.937007 inHg |
| 250 Torr | 9.842518 inHg |
| 500 Torr | 19.685037 inHg |
| 1,000 Torr | 39.370073 inHg |
How to convert torr to inches of mercury
Multiply by 0.03937007 — one torr is 0.03937007 inches of mercury. 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 20 ÷ 25.400004 = 0.78740146
What these units are
The torr and the inch of mercury are covered in the pressure unit guide, along with every other unit on this page.
Questions
How many inches of mercury are in a torr?
One torr is 0.03937007 inches of mercury. This figure is exact — it comes from the definition of the unit, not a measurement.
What is 20 torr in inches of mercury?
20 torr is 0.78740146 inches of mercury. The working is 20 ÷ 25.400004 = 0.78740146.
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.