This converter turns millibars into millimeters of mercury instantly, using the exact factor 1 millibar = 0.7500615758 millimeters of mercury. Type any number and the result updates as you go — nothing is sent to a server, so the arithmetic happens entirely in your browser.
The meteorologist’s unit — sea-level pressure averages 1013.25 mbar. The clinical unit for blood pressure worldwide.
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
millibars- The amount you are converting, measured in millibars
0.7500615758- The exact number of millimeters of mercury in one millibar
millimeters of mercury- The converted result
How it works, step by step
- Enter the number of millibars you want to convert.
- The value is multiplied by 0.7500615758, the exact conversion factor.
- The result is displayed in millimeters of mercury, rounded for readability.
- The unrounded value and the reverse conversion appear underneath so you can verify it.
Worked examples
Converting 5 millibars
Multiply 5 by 0.75006158. That gives 3.7503 millimeters of mercury. A quick sanity check: one millibar is smaller than one millimeter of mercury, so the number should get smaller — and it does.
Converting 72 millibars
72 × 0.75006158 = 54.0044 millimeters of mercury. Working backwards, 54.0044 ÷ 0.75006158 returns 72 millibars, which confirms the factor is applied the right way round.
How to read your score
Frequently asked questions
How many millimeters of mercury are in one millibar?
Exactly 0.7500615758. 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 millibars to millimeters of mercury?
Millimeters Of Mercury = millibars × 0.7500615758. To reverse it, divide instead: millibars = millimeters of mercury ÷ 0.7500615758, which is the same as multiplying by 1.333223874.
Is the millibar bigger than the millimeter of mercury?
No. One millibar is only 0.750062 of a millimeter of mercury, so the millimeter of mercury is the larger unit.
Why does my answer differ slightly from other millibar to mmhg 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 millibar?
The meteorologist’s unit — sea-level pressure averages 1013.25 mbar.
What is a millimeter of mercury?
The clinical unit for blood pressure worldwide.
Millibars to millimeters of mercury reference table
| Millibars | Millimeters Of Mercury |
|---|---|
| 0.5 mbar | 0.375031 mmHg |
| 1 mbar | 0.750062 mmHg |
| 2 mbar | 1.5001 mmHg |
| 3 mbar | 2.2502 mmHg |
| 5 mbar | 3.7503 mmHg |
| 10 mbar | 7.5006 mmHg |
| 15 mbar | 11.2509 mmHg |
| 20 mbar | 15.0012 mmHg |
| 25 mbar | 18.7515 mmHg |
| 50 mbar | 37.5031 mmHg |
| 75 mbar | 56.2546 mmHg |
| 100 mbar | 75.0062 mmHg |
| 250 mbar | 187.5154 mmHg |
| 500 mbar | 375.0308 mmHg |
| 1000 mbar | 750.0616 mmHg |
Exact factor: 1 millibar = 0.7500615758 millimeters of mercury. Values rounded for display.