Millibar to Bar
Convert millibar to bar instantly. 1 mbar = 0.001 bar. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert millibar to bar
To convert millibar to bar, divide by 1,000 (multiply by 0.001). The relationship is fixed, so the same factor works for any quantity — there is nothing to look up and nothing that changes with temperature, location or context.
bar = mbar × 0.001
Millibar to Bar conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Millibar | Bar |
|---|---|
| 1 mbar | 0.001 bar |
| 2 mbar | 0.002 bar |
| 3 mbar | 0.003 bar |
| 5 mbar | 0.005 bar |
| 10 mbar | 0.01 bar |
| 20 mbar | 0.02 bar |
| 25 mbar | 0.025 bar |
| 50 mbar | 0.05 bar |
| 100 mbar | 0.1 bar |
| 500 mbar | 0.5 bar |
| 1,000 mbar | 1 bar |
What is a millibar?
A thousandth of a bar, the meteorologist's unit for air pressure.
What is a bar?
Defined as exactly 100 kPa, very close to one atmosphere at sea level.
The formula
bar = mbar × 0.001
Every result on this page comes from this formula. Nothing is rounded until the final display, so figures match a spreadsheet to the cent.
How to use the Millibar to Bar
- Type the number of millibar you want to convert.
- Read the result in bar straight away — there is no button to press.
- Check the table below for the values that come up most often, or reverse the conversion with the linked bar to millibar page.
Millibar to Bar — frequently asked questions
How many bar are in a millibar?
One millibar equals 0.001 bar. bar = mbar × 0.001
What is the formula to convert millibar to bar?
The formula is bar = mbar × 0.001. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert bar back to millibar?
Divide instead of multiplying: one bar is 1,000 mbar. The reverse converter is linked in the related tools list.
Is this conversion exact?
Yes. Both units are defined against the same base unit by international agreement, so the factor is exact — any rounding you see is only in the display, which you can widen by entering more decimal places.
Is this millibar to bar free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
What people search for
This page answers each of these searches. They are the exact phrases visitors use to find the millibar to bar.
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About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 19, 2026 · Calculation runs client-side · No data collected · Report an error