mmHg to kPa Converter
Convert millimetres of mercury to kilopascals — the SI reading of a blood-pressure cuff. Results update as you type; exact factors shown.
One millimetre 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 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 |
|---|---|---|
| 60 mmHg | 7.9993 kPa | millimetre of mercurys to kilopascals |
| 80 mmHg | 10.6658 kPa | millimetre of mercurys to kilopascals |
| 90 mmHg | 11.999 kPa | millimetre of mercurys to kilopascals |
| 100 mmHg | 13.3322 kPa | millimetre of mercurys to kilopascals |
| 120 mmHg | 15.9987 kPa | millimetre of mercurys to kilopascals |
| 140 mmHg | 18.6651 kPa | millimetre of mercurys to kilopascals |
| 160 mmHg | 21.3316 kPa | millimetre of mercurys to kilopascals |
| 180 mmHg | 23.998 kPa | millimetre of mercurys to kilopascals |
| 200 mmHg | 26.6645 kPa | millimetre of mercurys to kilopascals |
| 400 mmHg | 53.329 kPa | millimetre of mercurys to kilopascals |
| 760 mmHg | 101.325 kPa | millimetre of mercurys to kilopascals |
| 1,000 mmHg | 133.3224 kPa | millimetre 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 |
| millimetre 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 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.