Millibars to Bars Converter
One Millibar equals 0.001 Bars (1 mbar = 0.001 bar). Multiply a Millibar value by 0.001 to get the equivalent in Bars. Enter your value in the calculator above. The formula and examples below show how to calculate it by hand.
Formula
bar = mbar × 0.001
Multiply the Millibar value by 0.001 to get the equivalent value in Bars.
Example Conversions
1 Millibar (mbar)
0.001 Bar (bar)
5 Millibar (mbar)
0.005 Bar (bar)
10 Millibar (mbar)
0.01 Bar (bar)
25 Millibar (mbar)
0.025 Bar (bar)
100 Millibar (mbar)
0.1 Bar (bar)
Conversion Table
| Millibar (mbar) | Bar (bar) |
|---|---|
| 0.1 | 0.0001 |
| 0.5 | 0.0005 |
| 1 | 0.001 |
| 2 | 0.002 |
| 5 | 0.005 |
| 10 | 0.01 |
| 25 | 0.025 |
| 50 | 0.05 |
| 100 | 0.1 |
| 250 | 0.25 |
| 500 | 0.5 |
| 1000 | 1 |
How to Convert Manually
Use these steps to convert Millibar values to Bar without the calculator.
- Write down the value in Millibar (mbar) that you want to convert.
- Multiply that value by 0.001.
- For example, 10 Millibars × 0.001 = 0.01 Bars.
- Label the result as Bar (bar).
Relative Size Comparison
This chart shows the visual difference in size between exactly one Millibar and one Bar.
About Millibar and Bar
The millibar is one thousandth of a bar, identical to the hectopascal. Meteorology has used millibars for surface pressure maps and storm intensity for a century. The bar is exactly 100,000 pascals, close to one atmosphere. European tire pressures, scuba tanks, and espresso machines are rated in bar. One Millibar equals 0.001 Bars (1 mbar = 0.001 bar). Millibar is used in weather maps and forecasts and in hurricane intensity reporting. Bar is used in European tire pressures.
Precision and Rounding:Several pressure factors are exact by definition (1 atm = 101,325 Pa; 1 bar = 100,000 Pa) while others, like psi and mmHg, are derived and carry long decimals. Tire and weather readings tolerate whole-number rounding; calibration, medicine, and process engineering need the full factor before rounding.
Use the pressure conversion guide to compare mmHg, mbar, inHg, kPa, Pa, and torr across medical, weather, aviation, vacuum, and engineering work.
Conversion factors per NIST Special Publication 811 and the BIPM SI Brochure (9th edition) (reference).
Worked Example
15Millibars equals0.015Bars.
15 mbar × 0.001 = 0.015 bar
FAQ
How do I convert Millibar to Bar?
Multiply the Millibar value by 0.001 to get the equivalent value in Bars.
What is the formula for Millibar to Bar?
The formula is bar = mbar × 0.001.
How many Bars are in 1 Millibar?
1 Millibar equals 0.001 Bars.
Can I convert Bar back to Millibar?
Yes. 1 Bar equals 1000 Millibars, and the related converter can reverse the calculation.
What are common names for Millibar and Bar?
Millibar is shown as mbar and may also be searched as millibars, mb. Bar is shown as bar and may also be searched as bars.
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