Millibar to Bar Converter
One Millibar equals 0.001 Bar (1 mbar = 0.001 bar). Multiply a Millibar value by 0.001 to get the equivalent in Bar. Use the calculator above for instant results, or follow the formula, worked examples, and reference table below.
Formula
bar = mbar × 0.001
Multiply the Millibar value by 0.001 to get the equivalent value in Bar.
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 Millibar × 0.001 = 0.01 Bar.
- 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 Bar (1 mbar = 0.001 bar). Millibar to Bar conversion comes up most often in weather maps and forecasts and in hurricane intensity reporting, typically when figures need restating for 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.
Conversion factors per NIST Special Publication 811 and the BIPM SI Brochure (9th edition) (reference).
Worked Example
15 Millibar equals 0.015 Bar.
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 Bar.
What is the formula for Millibar to Bar?
The formula is bar = mbar × 0.001.
How many Bar are in 1 Millibar?
1 Millibar equals 0.001 Bar.
Can I convert Bar back to Millibar?
Yes. 1 Bar equals 1000 Millibar, 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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