mmHg to PSI Converter
Convert millimetres of mercury to pounds per square inch — 51.715 mmHg to the psi. Results update as you type; exact factors shown.
One millimetre of mercury is 0.0193 pounds per square inch — see the exact factor, not a rounded rule of thumb.
How the mmhg to psi converter works
Pressures convert through the pascal (1 N/m²). One bar is exactly 100 kPa; a standard atmosphere is exactly 101.325 kPa; 1 psi is 6.894757 kPa (a pound-force on a square inch); 1 mmHg is 133.322 Pa by the conventional definition.
The UK is metric for most trade and science but keeps miles, pints, stone and mpg (with the imperial gallon) in daily life.
Common pressure conversions
| From | To | Units |
|---|---|---|
| 10 mmHg | 0.1934 psi | millimetre of mercurys to pounds per square inch |
| 50 mmHg | 0.9668 psi | millimetre of mercurys to pounds per square inch |
| 80 mmHg | 1.5469 psi | millimetre of mercurys to pounds per square inch |
| 100 mmHg | 1.9337 psi | millimetre of mercurys to pounds per square inch |
| 120 mmHg | 2.3204 psi | millimetre of mercurys to pounds per square inch |
| 200 mmHg | 3.8674 psi | millimetre of mercurys to pounds per square inch |
| 500 mmHg | 9.6684 psi | millimetre of mercurys to pounds per square inch |
| 760 mmHg | 14.696 psi | millimetre of mercurys to pounds per square inch |
| 1,000 mmHg | 19.3368 psi | millimetre of mercurys to pounds per square inch |
| 1,520 mmHg | 29.3919 psi | millimetre of mercurys to pounds per square inch |
| 2,000 mmHg | 38.6736 psi | millimetre of mercurys to pounds per square inch |
| 5,000 mmHg | 96.6839 psi | millimetre of mercurys to pounds per square inch |
Units in this converter and their exact factors
| Unit | Symbol | One unit in pascals |
|---|---|---|
| pascal | Pa | 1 pascal |
| kilopascal | kPa | 1,000 pascal |
| megapascal | MPa | 1,000,000 pascal |
| bar | bar | 100,000 pascal |
| millibar (hectopascal) | mbar | 100 pascal |
| standard atmosphere | atm | 101,325 pascal |
| pound per square inch | psi | 6,894.757293168 pascal |
| millimetre of mercury | mmHg | 133.322387415 pascal |
| inch of mercury | inHg | 3,386.389 pascal |
FAQFrequently asked questions about pressure conversion
How many psi is 760 mmHg?
14.696 psi — one atmosphere.
What is 120 mmHg?
2.32 psi — a typical systolic blood pressure.
Where is mmHg used?
Medicine and vacuum work almost exclusively.
Is mmHg the same as torr?
Almost — they differ by about one part in seven million.
What is 1 psi in mmHg?
51.715 mmHg.
Where these figures come from
- BIPM — The International System of Units (SI Brochure, 9th edition) — definitions of the base and derived units.
- NIST Special Publication 811 — Guide for the Use of the International System of Units — the exact conversion factors used here.
- National Physical Laboratory (NPL) — United Kingdom's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.