Convert Bar to Millibars
1 bar equals 1000 millibars (mbar).
1 bar = 1000 mbar
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk bar to millibar converter to paste a column from Excel.
How to Convert Bar to Millibar
- 1 bar = 1000 mbar
- 1 mbar = 0.001 bar
- Example: convert 15 bar to mbar: 15 bar = 15 × 1000 mbar = 15000 mbar
Formula
mbar = bar × 1000
Derivation from SI units:
- 1 bar = 10⁵ Pa (exact, by definition)
- 1 mbar = 10⁻³ bar = 100 Pa = 1 hPa
- 1 bar = 100000 Pa ÷ 100 Pa per mbar = 1000 mbar
Both units are defined exactly, so the factor is exact. Bar definition: bar; Millibar definition: millibar.
Worked examples
- A reading of 2 bar converts to 2000 mbar.
2 bar × 1000 = 2000 mbar - A value of 10 bar is 10000 mbar.
10 bar × 1000 = 10000 mbar
Bar to Millibar conversion table
| Bar | Millibars (mbar) |
|---|---|
| 0.01 bar | 10 mbar |
| 0.05 bar | 50 mbar |
| 0.1 bar | 100 mbar |
| 0.25 bar | 250 mbar |
| 0.5 bar | 500 mbar |
| 1 bar | 1000 mbar |
| 1.01325 bar | 1013.25 mbar |
| 1.5 bar | 1500 mbar |
| 2 bar | 2000 mbar |
| 2.5 bar | 2500 mbar |
| 3 bar | 3000 mbar |
| 4 bar | 4000 mbar |
| 5 bar | 5000 mbar |
| 6 bar | 6000 mbar |
| 7 bar | 7000 mbar |
| 8 bar | 8000 mbar |
| 10 bar | 10000 mbar |
| 12 bar | 12000 mbar |
| 16 bar | 16000 mbar |
| 20 bar | 20000 mbar |
| 25 bar | 25000 mbar |
| 40 bar | 40000 mbar |
| 100 bar | 100000 mbar |
| 200 bar | 200000 mbar |
| 300 bar | 300000 mbar |
Where it's used
Bar are used for compressed air and pneumatics (6–8 bar), while millibars appear in weather maps and barometers (sea level ≈ 1013 mbar). Both measure pressure, stress and differential pressure (force per unit area), so the conversion is a fixed factor.
Bar to other pressure units
| Conversion | 1 bar equals |
|---|---|
| bar to pascal | 100000 Pa |
| bar to kilopascal | 100 kPa |
| bar to megapascal | 0.1 MPa |
| bar to psi | 14.50377377 psi |
| bar to millibar | 1000 mbar |
| bar to decibar | 10 dbar |
| bar to torr | 750.0616827 Torr |
| bar to millimeter of mercury | 750.0615758 mmHg |
| bar to millimeter of water | 10197.16213 mmH₂O |
| bar to centimeter of water | 1019.716213 cmH₂O |
| bar to inch of water | 401.463076 inH₂O |
| bar to inch of water (60 °F) | 401.864652 inH₂O (60 °F) |
| bar to inch of mercury | 29.5299833 inHg |
| bar to atmosphere | 0.9869232667 atm |
| bar to barye | 1000000 Ba |
Frequently asked questions
How many millibars are in 1 bar?
1 bar = 1000 mbar.
How do I convert bar to millibars?
Multiply the value in bar by 1000. For example, 15 bar × 1000 = 15000 mbar.
Is the bar to mbar conversion exact?
Yes. Both units are defined exactly, and 1 bar is exactly 1000 mbar.
Sources
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "bar".
- Guide for the Use of the International System of Units (SI), NIST Special Publication 811, 2008 Edition, National Institute of Standards and Technology , Appendix B.8, "millibar".
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Bar to Millibars. Retrieved October 17, 2026, from https://scientificconverters.com/pressure/bar-to-millibar/
IEEE
Scientific Converters, "Convert Bar to Millibars," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/pressure/bar-to-millibar/