5 mmHg to atm — 5 millimetres of mercury in standard atmospheres
Exact 5 ÷ 759.999892 = 0.006578948306
5 millimetres of mercury in other units
| Pascals | 666.611937 | Pa |
|---|---|---|
| Hectopascals | 6.666119 | hPa |
| Kilopascals | 0.66661194 | kPa |
| Megapascals | 0.000666611937 | MPa |
| Millibars | 6.666119 | mbar |
| Bar | 0.006666119371 | bar |
| Standard atmospheres | 0.006578948306 | atm |
| Pounds per square inch | 0.09668389 | psi |
| Torr | 5.000001 | Torr |
| Inches of mercury | 0.19685039 | inHg |
mmHg to atm at a glance
| Millimetres of mercury | Standard atmospheres |
|---|---|
| 1 mmHg | 0.001315789661 atm |
| 2 mmHg | 0.002631579322 atm |
| 3 mmHg | 0.003947368983 atm |
| 5 mmHg | 0.006578948306 atm |
| 10 mmHg | 0.0131579 atm |
| 20 mmHg | 0.02631579 atm |
| 25 mmHg | 0.03289474 atm |
| 50 mmHg | 0.06578948 atm |
| 100 mmHg | 0.13157897 atm |
| 250 mmHg | 0.32894742 atm |
| 500 mmHg | 0.65789483 atm |
| 1,000 mmHg | 1.31579 atm |
How to convert millimetres of mercury to standard atmospheres
Multiply by 0.001315789661 — one millimetre of mercury is 0.001315789661 standard atmospheres. 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 5 ÷ 759.999892 = 0.006578948306
What these units are
The millimetre of mercury and the standard atmosphere are covered in the pressure unit guide, along with every other unit on this page.
Questions
How many standard atmospheres are in a millimetre of mercury?
One millimetre of mercury is 0.001315789661 standard atmospheres. This figure is exact — it comes from the definition of the unit, not a measurement.
What is 5 millimetres of mercury in standard atmospheres?
5 millimetres of mercury is 0.006578948306 standard atmospheres. The working is 5 ÷ 759.999892 = 0.006578948306.
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.