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To convert from pound per square inch (psi) to millimeter of mercury (mmHg), use the following formula:
millimeter of mercury (mmHg)
= 11000 × 10.00014503768078 × 10.133322× pound per square inch (psi)
= 51.715095786517900835× pound per square inch (psi)
With 10.00014503768078 is the ratio between the base units kilopascal (kPa) and kilopound per square inch (ksi).
Let's convert 5 pound per square inch (psi) to millimeter of mercury (mmHg).
Using the formula:
5 × 51.715095786517900835 = 258.57547893258950418
Therefore, 5 pound per square inch (psi) is equal to 258.57547893258950418 millimeter of mercury (mmHg).
How many pounds per square inch are in one millimeter of mercury? One millimeter of mercury (mmHg) contains 0.01933671367695116 pounds per square inch (psi) — the inverse of the factor above. Multiplying by 51.715095786517900835 takes you from pounds per square inch to millimeters of mercury; multiplying by 0.01933671367695116 brings you back.
Put in words: one pound per square inch equals 51.715095786517900835 millimeters of mercury, so the pound per square inch is the larger unit of this pair. Converting between them never changes the amount of pressure being measured — only the size of the unit you count it in.
A pound per square inch (PSI) is a unit of pressure commonly used in the imperial system (which is standard in the United States).
It measures the amount of force applied over a single square inch of area.
PSI is a critical measurement for safety and performance in many common items, including:
Vehicle Tires: Proper tire pressure (PSI) ensures optimal handling, fuel efficiency, and tire life. You can find the recommended level on a sticker inside the driver's door.
Home Water Pressure: Affects everything from shower performance to how well appliances like dishwashers and washing machines function.
Sports Equipment: Items like footballs, basketballs, and soccer balls require a specific PSI to perform correctly and safely.
Tools: Air compressors, pressure washers, and paint sprayers all have specific PSI ratings for safe and effective operation.
While PSI is standard in the imperial system, scientific and international contexts use metric (SI) units like the Pascal (Pa) and the bar.
PSI to Pascal (Pa): The official SI unit for pressure.
1 PSI ≈ 6,894.76 Pascals (or 6.895 kilopascals, kPa).
PSI to Bar: A common unit in automotive and weather contexts. 1 bar is roughly equal to atmospheric pressure at sea level.
1 PSI ≈ 0.0689 bar.
The term "PSI" can be specified further to give more context:
PSIG (Pound-force per square inch gauge): Measures pressure relative to the surrounding atmospheric pressure. This is the most common measurement, used by a standard tire gauge.
PSIA (Pound-force per square inch absolute): Measures pressure relative to a perfect vacuum (absolute zero pressure).
The formula is: PSIA = PSIG + local atmospheric pressure.
PSID (Pound-force per square inch differential): Measures the difference in pressure between two separate points in a system, such as across a filter or valve.
A millimeter of mercury (mmHg) is a manometric unit of pressure.
It was historically defined as the pressure generated by a column of mercury exactly one millimeter high.
Today, it is most famous as the unit used in medicine for measuring blood pressure. It is also commonly used in meteorology, aviation, and physics to measure atmospheric pressure or vacuum pressure.
The mmHg unit originates from the invention of the barometer by Evangelista Torricelli in 1643.
Torricelli's device measured atmospheric pressure by seeing how high it could support a column of mercury in a tube.
Standard atmospheric pressure was found to support a column approximately 760 mm high, which established 760 mmHg as a standard reference point.
The most well-known application of mmHg is in medicine.
Blood Pressure: Readings are given as two numbers: systolic pressure (when the heart beats) over diastolic pressure (when the heart rests), such as 120/80 mmHg. This is a critical vital sign for human health.
Meteorology: Used for reporting barometric (atmospheric) pressure, which helps in weather forecasting.
Physics & Engineering: Used for measuring vacuum pressures and other low-pressure systems where precision is needed.
While mmHg is common, other pressure units are standard in different fields. Here are the most common conversions:
Here are some quick reference conversions from pound per square inch (psi) to millimeter of mercury (mmHg):
| pounds per square inch | millimeters of mercury |
|---|---|
| 0.000001 psi | 0.000051715095786517900835 mmHg |
| 0.001 psi | 0.051715095786517900835 mmHg |
| 0.1 psi | 5.1715095786517900835 mmHg |
| 1 psi | 51.715095786517900835 mmHg |
| 2 psi | 103.43019157303580167 mmHg |
| 3 psi | 155.14528735955370251 mmHg |
| 4 psi | 206.86038314607160334 mmHg |
| 5 psi | 258.57547893258950418 mmHg |
| 6 psi | 310.29057471910740501 mmHg |
| 7 psi | 362.00567050562530585 mmHg |
| 8 psi | 413.72076629214320668 mmHg |
| 9 psi | 465.43586207866110752 mmHg |
| 10 psi | 517.15095786517900835 mmHg |
| 20 psi | 1034.3019157303580167 mmHg |
| 30 psi | 1551.4528735955370251 mmHg |
| 40 psi | 2068.6038314607160334 mmHg |
| 50 psi | 2585.7547893258950418 mmHg |
| 100 psi | 5171.5095786517900835 mmHg |
| 1000 psi | 51715.095786517900835 mmHg |
| 10000 psi | 517150.95786517900835 mmHg |
For all Pressure converters, choose units using the From/To dropdowns above.