mmHg to PSI Converter
Convert millimeters of mercury to pounds per square inch — 51.715 mmHg to the psi. Results update as you type; exact factors shown.
One millimeter 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 US uses customary units (US gallon, short ton, °F) in daily life; NIST SP 811 gives the exact SI factors.
Common pressure conversions
| From | To | Units |
|---|---|---|
| 10 mmHg | 0.1934 psi | millimeter of mercurys to pounds per square inch |
| 50 mmHg | 0.9668 psi | millimeter of mercurys to pounds per square inch |
| 80 mmHg | 1.5469 psi | millimeter of mercurys to pounds per square inch |
| 100 mmHg | 1.9337 psi | millimeter of mercurys to pounds per square inch |
| 120 mmHg | 2.3204 psi | millimeter of mercurys to pounds per square inch |
| 200 mmHg | 3.8674 psi | millimeter of mercurys to pounds per square inch |
| 500 mmHg | 9.6684 psi | millimeter of mercurys to pounds per square inch |
| 760 mmHg | 14.696 psi | millimeter of mercurys to pounds per square inch |
| 1,000 mmHg | 19.3368 psi | millimeter of mercurys to pounds per square inch |
| 1,520 mmHg | 29.3919 psi | millimeter of mercurys to pounds per square inch |
| 2,000 mmHg | 38.6736 psi | millimeter of mercurys to pounds per square inch |
| 5,000 mmHg | 96.6839 psi | millimeter 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 |
| millimeter 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 Institute of Standards and Technology (NIST) — United States's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.