Millimeters Of Mercury to Torr
An instant millimeters of mercury-to-torr converter, with the formula and a reference table below.
| Millimeters Of Mercury | Torr |
|---|---|
| 1 mmHg | 1 Torr |
| 2 mmHg | 2 Torr |
| 3 mmHg | 3 Torr |
| 5 mmHg | 5.000001 Torr |
| 10 mmHg | 10.000001 Torr |
| 25 mmHg | 25.000004 Torr |
| 50 mmHg | 50.000007 Torr |
| 100 mmHg | 100.000014 Torr |
How to use
- Enter a value in the Millimeters Of Mercury field.
- The Torr figure appears immediately — no button to press.
- Typing in the Torr 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 Torr formula
Converting millimeters of mercury to torr is a single multiplication by 1.00000014.
Torr = mmHg × 1.00000014
Why this factor: the millimeter of mercury and the torr are both defined against the pascal, so dividing one definition by the other gives 1.00000014 directly. Both definitions are set out in full below.
To go the other way, divide by 1.00000014 — or use the Torr to Millimeters Of Mercury converter, which is the same calculation reversed.
Worked example
Take 100 mmHg and multiply by the factor 1.00000014: the result is 100.000014 Torr.
100 mmHg × 1.00000014 = 100.000014 Torr
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 torr?
A torr is a vacuum-measurement pressure unit, defined as one 760th of a standard atmosphere.
Definition: Exactly 101,325/760 pascals, which is about 133.3224 Pa. Named after Evangelista Torricelli.
Where it is used: Vacuum systems, mass spectrometry, and semiconductor process chambers.
Worth knowing: Almost identical to the mmHg but not exactly equal — they differ by about one part in seven million, which matters only in precision metrology.
Millimeters Of Mercury vs Torr
The millimeter of mercury and the torr belong to the same family of units, so converting between them is usually a matter of shifting a decimal point or applying a small whole-number factor.
Frequently asked questions
How many torr are in a millimeter of mercury?
One millimeter of mercury equals 1.00000014 torr.
What is the formula to convert millimeters of mercury to torr?
Multiply the number of millimeters of mercury by 1.00000014. To reverse it, divide by 1.00000014 instead.
How do I convert torr back to millimeters of mercury?
Divide by 1.00000014, which is the same as multiplying by 0.999999858.
How many torr are in 10 millimeters of mercury?
10 mmHg works out to 10.000001 Torr.
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.