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.
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 |
|---|---|---|
| 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 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.