Bar to Millibar Converter
Convert bar to millibar — multiply by a thousand. Results update as you type; exact factors shown.
One bar is 1,000 millibar (hectopascal) — see the exact factor, not a rounded rule of thumb.
How the bar to millibar 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 |
|---|---|---|
| 0.001 bar | 1 mbar | bars to millibar (hectopascal) |
| 0.01 bar | 10 mbar | bars to millibar (hectopascal) |
| 0.1 bar | 100 mbar | bars to millibar (hectopascal) |
| 0.5 bar | 500 mbar | bars to millibar (hectopascal) |
| 1 bar | 1,000 mbar | bar to millibar (hectopascal) |
| 1.0133 bar | 1,013.25 mbar | bars to millibar (hectopascal) |
| 1.5 bar | 1,500 mbar | bars to millibar (hectopascal) |
| 2 bar | 2,000 mbar | bars to millibar (hectopascal) |
| 5 bar | 5,000 mbar | bars to millibar (hectopascal) |
| 10 bar | 10,000 mbar | bars to millibar (hectopascal) |
| 50 bar | 50,000 mbar | bars to millibar (hectopascal) |
| 200 bar | 200,000 mbar | bars to millibar (hectopascal) |
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?
Exactly 1,000.
What is standard atmospheric pressure?
1,013.25 mbar, which is 1.01325 bar.
Is a millibar the same as a hectopascal?
Yes — 1 mbar = 1 hPa = 100 Pa. Weather services use hPa; older charts use mbar.
What pressure is a deep low?
Below about 980 mbar; severe storms go under 950.
What is 2 bar in mbar?
2,000 mbar.
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.