Bars to Millibars Converter
Enter the pressure in bars below to convert it to millibars.
Convert Bars to Millibars
Enter a value in bars (bar) to convert to millibars (mbar).
Bar to Millibar Conversion Table
Table showing various bar measurements converted to millibars. Click any preset value or arrow to load it into the converter.
| Bars (bar) | Millibars (mbar) |
|---|---|
| 1 bar | 1,000 mbar |
| 2 bar | 2,000 mbar |
| 2.5 bar | 2,500 mbar |
| 5 bar | 5,000 mbar |
| 10 bar | 10,000 mbar |
| 15 bar | 15,000 mbar |
| 20 bar | 20,000 mbar |
| 25 bar | 25,000 mbar |
| 30 bar | 30,000 mbar |
| 50 bar | 50,000 mbar |
How to Convert Bars to Millibars
To convert bars to millibars, multiply the pressure by the following conversion ratio: 1,000 millibars/bar.
Since one bar is equal to 1,000 millibars, you can use this simple formula to convert:
The pressure in millibars is equal to the pressure in bars multiplied by 1,000.
For example, here's how to convert 5 bars to millibars using the formula above.
How Many Millibars Are in a Bar?
There are 1,000 millibars in a bar, which is why we use this value in the formula above.
Our bar to millibar calculator automatically converts your pressure measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Bars and millibars are both units used to measure pressure. Keep reading to learn more about each unit.
What Is a Bar?
A bar is a unit of pressure equal to 100,000 pascals (Pa), the base unit for pressure. Metric pressure unit equal to 100,000 Pascals (100 kPa). [1]
The bar is classified as a metric and SI-compatible unit of pressure. Bars can be abbreviated as bar; for example, 1 bar can be written as 1 bar.
When working with bars (bar) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, bars (bar) are widely used across large-scale industrial, bulk, and macro-level pressure specifications within SI metric workflows, engineering documentation, and technical data sheets.
What Is a Millibar?
A millibar is a unit of pressure equal to 100 pascals (Pa), the base unit for pressure. Meteorological pressure unit equal to 1/1000 of a bar (100 Pa = 1 hPa). [2]
The millibar is classified as a metric and SI-compatible unit of pressure. Millibars can be abbreviated as mbar; for example, 1 millibar can be written as 1 mbar.
In the metric system, "milli" is the standard SI prefix for thousandths, or 10⁻³. This makes the millibar (mbar) a convenient decimal multiple of the bar (100,000 Pa).
In practice, millibars (mbar) are widely used across standard pressure applications within SI metric workflows, engineering documentation, and technical data sheets.
When converting pressure between bars (bar) and millibars (mbar), keep full floating-point precision (1 bar = 1,000 mbar; 1 mbar = 0.001 bar) during intermediate calculations and round only the final millibar figure to match your instrument tolerance.
More Bar & Millibar Conversions
Need to calculate in the opposite direction? Use our millibars to bars calculator to switch your starting unit immediately. You can also explore related tools such as converting millibars to bars, converting bars to psi, or converting bars to atmospheres.
Frequently Asked Questions
References
- [1]NIST SP 811 StandardNIST SP 811 (NIST SP 811 App. B.9 (Pressure & Stress))·Pressure Metrology Standard — Bars (bar) to Millibars (mbar)
- [2]NIST CUU SpecificationNIST CUU (Derived SI Unit: Pascal (Pa))·Unit Specifications: Bar (bar) & Millibar (mbar)
- [3]BIPM ReferenceBIPM (SI Brochure (9th Ed.) — Mechanics)·Conversion Factors & Mathematical Basis (bar to mbar)