Millibar to inHg Converter
Convert millibars to inches of mercury — the reverse altimeter conversion. Results update as you type; exact factors shown.
One millibar (hectopascal) is 0.0295 inches of mercury — see the exact factor, not a rounded rule of thumb.
How the millibar to inhg 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.
Australia is fully metric under the National Measurement Act 1960; imperial units appear only in trade with the US and in older documents.
Common pressure conversions
| From | To | Units |
|---|---|---|
| 950 mbar | 28.0535 inHg | millibar (hectopascal) to inches of mercury |
| 970 mbar | 28.6441 inHg | millibar (hectopascal) to inches of mercury |
| 990 mbar | 29.2347 inHg | millibar (hectopascal) to inches of mercury |
| 1,000 mbar | 29.53 inHg | millibar (hectopascal) to inches of mercury |
| 1,013.25 mbar | 29.9213 inHg | millibar (hectopascal) to inches of mercury |
| 1,020 mbar | 30.1206 inHg | millibar (hectopascal) to inches of mercury |
| 1,030 mbar | 30.4159 inHg | millibar (hectopascal) to inches of mercury |
| 1,040 mbar | 30.7112 inHg | millibar (hectopascal) to inches of mercury |
| 900 mbar | 26.577 inHg | millibar (hectopascal) to inches of mercury |
| 1,050 mbar | 31.0065 inHg | millibar (hectopascal) to inches of mercury |
| 850 mbar | 25.1005 inHg | millibar (hectopascal) to inches of mercury |
| 700 mbar | 20.671 inHg | millibar (hectopascal) to inches of mercury |
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
What is 1,013 mbar in inHg?
29.92 inHg.
How many mbar is 1 inHg?
33.8639 mbar.
Which regions use which?
The US and Canada use inches of mercury; Europe, Australia and most of Asia use hectopascals.
What is 1,000 mbar in inHg?
29.53 inHg.
Why does aviation care?
An altimeter set to the wrong pressure reads the wrong altitude — about 30 feet per millibar.
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 Measurement Institute (NMI) — Australia's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.