Millimeters Of Mercury to Bars
An instant millimeters of mercury-to-bars converter, with the formula and a reference table below.
| Millimeters Of Mercury | Bars |
|---|---|
| 1 mmHg | 0.001333 bar |
| 2 mmHg | 0.002666 bar |
| 3 mmHg | 0.004 bar |
| 5 mmHg | 0.006666 bar |
| 10 mmHg | 0.013332 bar |
| 25 mmHg | 0.033331 bar |
| 50 mmHg | 0.066661 bar |
| 100 mmHg | 0.133322 bar |
How to use
- Enter a value in the Millimeters Of Mercury field.
- The Bars figure appears immediately — no button to press.
- Typing in the Bars field converts back to Millimeters Of Mercury the same way.
- Use the reference table for the values that come up most often.
Millimeters Of Mercury to Bars formula
To convert millimeters of mercury to bars, multiply by 0.00133322387.
bar = mmHg × 0.00133322387
Why this factor: the millimeter of mercury and the bar are both defined against the pascal, so dividing one definition by the other gives 0.00133322387 directly. Both definitions are set out in full below.
To go the other way, divide by 0.00133322387 — or use the Bars to Millimeters Of Mercury converter, which is the same calculation reversed.
Worked example
Start with 32 mmHg. Multiply by 0.00133322387 to get 0.042663 bar.
32 mmHg × 0.00133322387 = 0.042663 bar
The converter above does this for any value you type, in either direction.
What is a millimeter of mercury?
A millimeter of mercury is the pressure exerted by a 1 mm column of mercury, still standard in medicine.
Definition: Defined as exactly 133.322387415 pascals.
Where it is used: Blood pressure readings, intraocular pressure, and respiratory gas pressures.
Worth knowing: Blood pressure is universally reported in mmHg even in fully metric countries — one of the most durable legacy units in medicine.
What is a bar?
A bar is a metric pressure unit chosen to sit very close to atmospheric pressure.
Definition: Exactly 100,000 pascals by definition. Standard atmosphere is 1.01325 bar, so a bar is slightly less.
Where it is used: European tire and hydraulic pressures, diving depth equivalents, and espresso machine ratings.
Worth knowing: Close to one atmosphere but not equal to it — the difference is about 1.3%.
Millimeters Of Mercury vs Bars
The millimeter of mercury is a specialized unit while the bar is a metric unit. That is why the factor between them is not a round number: the two systems were defined independently and only later tied together by exact agreement.
Frequently asked questions
How many bars are in a millimeter of mercury?
One millimeter of mercury equals 0.00133322387 bars.
What is the formula to convert millimeters of mercury to bars?
Multiply the number of millimeters of mercury by 0.00133322387. To reverse it, divide by 0.00133322387 instead.
How do I convert bars back to millimeters of mercury?
Divide by 0.00133322387, which is the same as multiplying by 750.061576.
How many bars are in 10 millimeters of mercury?
10 mmHg works out to 0.013332 bar.
Is there anything to watch out for with millimeters of mercury?
Blood pressure is universally reported in mmHg even in fully metric countries — one of the most durable legacy units in medicine.
How is the millimeter of mercury defined?
Defined as exactly 133.322387415 pascals.