mmHg to kPa Converter
Convert millimeters of mercury to kilopascals — the SI reading of a blood-pressure cuff. Results update as you type; exact factors shown.
One millimeter of mercury is 0.1333 kilopascals — see the exact factor, not a rounded rule of thumb.
How the mmhg to kpa 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 |
|---|---|---|
| 60 mmHg | 7.9993 kPa | millimeter of mercurys to kilopascals |
| 80 mmHg | 10.6658 kPa | millimeter of mercurys to kilopascals |
| 90 mmHg | 11.999 kPa | millimeter of mercurys to kilopascals |
| 100 mmHg | 13.3322 kPa | millimeter of mercurys to kilopascals |
| 120 mmHg | 15.9987 kPa | millimeter of mercurys to kilopascals |
| 140 mmHg | 18.6651 kPa | millimeter of mercurys to kilopascals |
| 160 mmHg | 21.3316 kPa | millimeter of mercurys to kilopascals |
| 180 mmHg | 23.998 kPa | millimeter of mercurys to kilopascals |
| 200 mmHg | 26.6645 kPa | millimeter of mercurys to kilopascals |
| 400 mmHg | 53.329 kPa | millimeter of mercurys to kilopascals |
| 760 mmHg | 101.325 kPa | millimeter of mercurys to kilopascals |
| 1,000 mmHg | 133.3224 kPa | millimeter of mercurys to kilopascals |
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 kPa in one mmHg?
0.133322 kPa.
What is 120/80 mmHg in kPa?
16.0/10.7 kPa.
Which does a doctor use?
mmHg, everywhere. The kPa equivalent appears mainly in physiology texts and in some European labs.
What is 760 mmHg in kPa?
101.325 kPa — one atmosphere.
Why has mmHg survived?
Because every clinical threshold, guideline and trial result is written in it; changing units would mean rewriting all of them.
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.