3 Torr to hPa — 3 torr in hectopascals
Exact 3 × 1.333224 = 3.999671
3 torr in other units
| Pascals | 399.967105 | Pa |
|---|---|---|
| Hectopascals | 3.999671 | hPa |
| Kilopascals | 0.39996711 | kPa |
| Megapascals | 0.000399967105 | MPa |
| Millibars | 3.999671 | mbar |
| Bar | 0.003999671053 | bar |
| Standard atmospheres | 0.003947368421 | atm |
| Pounds per square inch | 0.05801032 | psi |
| Millimetres of mercury | 3 | mmHg |
| Inches of mercury | 0.11811022 | inHg |
Torr to hPa at a glance
| Torr | Hectopascals |
|---|---|
| 1 Torr | 1.333224 hPa |
| 2 Torr | 2.666447 hPa |
| 3 Torr | 3.999671 hPa |
| 5 Torr | 6.666118 hPa |
| 10 Torr | 13.332237 hPa |
| 20 Torr | 26.664474 hPa |
| 25 Torr | 33.330592 hPa |
| 50 Torr | 66.661184 hPa |
| 100 Torr | 133.322368 hPa |
| 250 Torr | 333.305921 hPa |
| 500 Torr | 666.611842 hPa |
| 1,000 Torr | 1,333.22 hPa |
How to convert torr to hectopascals
Multiply by 1.333224 — one torr is 1.333224 hectopascals. 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 3 × 1.333224 = 3.999671
In words: about four hectopascals.
What these units are
The torr and the hectopascal are covered in the pressure unit guide, along with every other unit on this page.
Questions
How many hectopascals are in a torr?
One torr is 1.333224 hectopascals. This figure is exact — it comes from the definition of the unit, not a measurement.
What is 3 torr in hectopascals?
3 torr is 3.999671 hectopascals. The working is 3 × 1.333224 = 3.999671.
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.