Millibar to Bar Converter
Convert millibar to bar — divide by a thousand. Results update as you type; exact factors shown.
One millibar (hectopascal) is 0.001 bars — see the exact factor, not a rounded rule of thumb.
How the millibar to bar 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 |
|---|---|---|
| 100 mbar | 0.1 bar | millibar (hectopascal) to bars |
| 500 mbar | 0.5 bar | millibar (hectopascal) to bars |
| 950 mbar | 0.95 bar | millibar (hectopascal) to bars |
| 980 mbar | 0.98 bar | millibar (hectopascal) to bars |
| 1,000 mbar | 1 bar | millibar (hectopascal) to bars |
| 1,013.25 mbar | 1.0133 bar | millibar (hectopascal) to bars |
| 1,030 mbar | 1.03 bar | millibar (hectopascal) to bars |
| 1,500 mbar | 1.5 bar | millibar (hectopascal) to bars |
| 2,000 mbar | 2 bar | millibar (hectopascal) to bars |
| 5,000 mbar | 5 bar | millibar (hectopascal) to bars |
| 10,000 mbar | 10 bar | millibar (hectopascal) to bars |
| 50,000 mbar | 50 bar | millibar (hectopascal) to bars |
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 millibars in a bar?
1,000.
What is 1,013.25 mbar?
One standard atmosphere, or 1.01325 bar.
What does a barometer reading of 1,030 mean?
High pressure — settled weather. Below 1,000 usually means unsettled.
Are millibars still used?
Widely in aviation and shipping; meteorology has largely moved to hectopascals, which are identical.
What is 950 mbar in bar?
0.95 bar.
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.