Bars to Millibars Converter
One Bar equals 1000 Millibars (1 bar = 1000 mbar). Multiply a Bar value by 1000 to get the equivalent in Millibars. Enter a value above to calculate the result. You can also use the formula and reference table below.
Formula
mbar = bar × 1000
Multiply the Bar value by 1000 to get the equivalent value in Millibars.
Example Conversions
1 Bar (bar)
1000 Millibar (mbar)
5 Bar (bar)
5000 Millibar (mbar)
10 Bar (bar)
10000 Millibar (mbar)
25 Bar (bar)
25000 Millibar (mbar)
100 Bar (bar)
100000 Millibar (mbar)
Conversion Table
| Bar (bar) | Millibar (mbar) |
|---|---|
| 0.1 | 100 |
| 0.5 | 500 |
| 1 | 1000 |
| 2 | 2000 |
| 5 | 5000 |
| 10 | 10000 |
| 25 | 25000 |
| 50 | 50000 |
| 100 | 100000 |
| 250 | 250000 |
| 500 | 500000 |
| 1000 | 1000000 |
How to Convert Manually
Use these steps to convert Bar values to Millibar without the calculator.
- Write down the value in Bar (bar) that you want to convert.
- Multiply that value by 1000.
- For example, 10 Bars × 1000 = 10000 Millibars.
- Label the result as Millibar (mbar).
Relative Size Comparison
This chart shows the visual difference in size between exactly one Bar and one Millibar.
About Bar and Millibar
The bar is exactly 100,000 pascals, close to one atmosphere. European tire pressures, scuba tanks, and espresso machines are rated in 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. One Bar equals 1000 Millibars (1 bar = 1000 mbar). Bar is used in European tire pressures and in scuba diving tank pressure. Millibar is used in weather maps and forecasts.
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
15Bars equals15000Millibars.
15 bar × 1000 = 15000 mbar
FAQ
How do I convert Bar to Millibar?
Multiply the Bar value by 1000 to get the equivalent value in Millibars.
What is the formula for Bar to Millibar?
The formula is mbar = bar × 1000.
How many Millibars are in 1 Bar?
1 Bar equals 1000 Millibars.
Can I convert Millibar back to Bar?
Yes. 1 Millibar equals 0.001 Bars, and the related converter can reverse the calculation.
What are common names for Bar and Millibar?
Bar is shown as bar and may also be searched as bars. Millibar is shown as mbar and may also be searched as millibars, mb.
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