How to Convert Bar to Millibars (bar to mbar)
Pressure conversions are used for tyre pressure (psi or bar), blood pressure readings in mmHg and weather maps in millibars. This guide shows how to convert bar into millibars by hand, with examples and a quick-reference table.
The conversion
To convert bar to millibars, multiply the value by 1,000. To go the other way, divide by the same number (or multiply by 0.001). For a quick estimate, multiply by about 1,000.
Millibars = bar × 1,000
Worked examples
- 3 bar = 3,000 mbar
- 12.5 bar = 12,500 mbar
- 75 bar = 75,000 mbar
Bar to Millibars table
| Bar | Millibars |
|---|---|
| 1 bar | 1,000 mbar |
| 2 bar | 2,000 mbar |
| 5 bar | 5,000 mbar |
| 10 bar | 10,000 mbar |
| 20 bar | 20,000 mbar |
| 25 bar | 25,000 mbar |
| 50 bar | 50,000 mbar |
| 100 bar | 100,000 mbar |
| 250 bar | 250,000 mbar |
| 500 bar | 500,000 mbar |
| 1,000 bar | 1,000,000 mbar |
Common questions
Is bar to mbar exact?
The factors used here are the internationally defined values where they exist; results are rounded for display only.
How do I convert back?
Use the Millibars to Bar converter.
Mistakes to avoid
Dropping the units
A bare number without a unit is easy to misread later. Always write the unit with the result.
Mixing similar-sounding units
US and imperial gallons, pints and tons are different sizes, and decimal kilobytes differ from binary kibibytes.
Forgetting squared and cubed units
Area and volume factors are the length factor squared or cubed, so 1 m² is about 10.76 sq ft, not 3.28.
Background
Unit conversion is simply multiplication by a fixed ratio. The ratio between two units of the same quantity never changes, so once you know it you can convert any value in either direction.
Writing the units next to every number while you work is the simplest way to avoid mistakes. If the units do not cancel to leave the one you want, the calculation is set up wrongly.
For everyday use, three or four significant figures are usually enough. Engineering, science and trade documents may need more, and rounding should happen only at the end of a calculation.
For any value, use the Bar to Millibars Converter or browse all pressure converters.
Run your own numbers: Bar to Millibars Converter