This converter turns bar into millibars instantly, using the exact factor 1 bar = 1000 millibars. Type any number and the result updates as you go — nothing is sent to a server, so the arithmetic happens entirely in your browser.
Almost exactly atmospheric pressure; standard in European industry and diving. The meteorologist’s unit — sea-level pressure averages 1013.25 mbar.
Because the relationship is a simple proportion, one multiplication does the whole job. The table further down gives pre-computed values for the amounts people look up most often, and the result panel also reports the reverse conversion so you can check the figure both ways.
The formula
bar- The amount you are converting, measured in bar
1000- The exact number of millibars in one bar
millibars- The converted result
How it works, step by step
- Enter the number of bar you want to convert.
- The value is multiplied by 1000, the exact conversion factor.
- The result is displayed in millibars, rounded for readability.
- The unrounded value and the reverse conversion appear underneath so you can verify it.
Worked examples
Converting 5 bar
Multiply 5 by 1000. That gives 5,000 millibars. A quick sanity check: one bar is larger than one millibar, so the number should get bigger — and it does.
Converting 72 bar
72 × 1000 = 72,000 millibars. Working backwards, 72,000 ÷ 1000 returns 72 bar, which confirms the factor is applied the right way round.
How to read your score
Frequently asked questions
How many millibars are in one bar?
Exactly 1000. Every conversion on this page is that single number multiplied by your input, so the result carries no rounding error beyond what is shown.
What is the formula to convert bar to millibars?
Millibars = bar × 1000. To reverse it, divide instead: bar = millibars ÷ 1000, which is the same as multiplying by 0.001.
Is the bar bigger than the millibar?
Yes. One bar equals 1000 millibars, so it is the larger unit.
Why does my answer differ slightly from other bar to millibar converters?
Most differences come from rounding the factor too early. This tool keeps full double precision through the calculation and only rounds at the final display step, and it also shows the unrounded value so you can see exactly where any difference appears.
What is a bar?
Almost exactly atmospheric pressure; standard in European industry and diving.
What is a millibar?
The meteorologist’s unit — sea-level pressure averages 1013.25 mbar.
Bar to millibars reference table
| Bar | Millibars |
|---|---|
| 0.5 bar | 500 mbar |
| 1 bar | 1,000 mbar |
| 2 bar | 2,000 mbar |
| 3 bar | 3,000 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 |
| 50 bar | 50,000 mbar |
| 75 bar | 75,000 mbar |
| 100 bar | 100,000 mbar |
| 250 bar | 250,000 mbar |
| 500 bar | 500,000 mbar |
| 1000 bar | 1,000,000 mbar |
Exact factor: 1 bar = 1000 millibars. Values rounded for display.