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 US uses customary units (US gallon, short ton, °F) in daily life; NIST SP 811 gives the exact SI factors.
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 |
| millimeter 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 Institute of Standards and Technology (NIST) — United States's national measurement authority.
Last checked: September 2026. Conversion factors are fixed by definition and do not change with tax years or regulations.