Millimeters Of Mercury to Torr
Millimeters of mercury measure pressure by how high it pushes a column of mercury, the traditional unit for blood pressure readings. A torr is approximately the pressure exerted by 1 millimeter of mercury, used in vacuum and lab pressure measurements. 1 mmHg equals ≈1 torr, so converting between them is a matter of multiplying by that fixed factor — type any value into the converter below and both sides update instantly as you type.
Both units belong to pressure, measured here against pressure's base unit (Pa) — every other pressure unit on this site converts through that same reference point, which is why the table below can also be read as a quick cross-check against nearby values.
Formula
torr = mmHg × ≈1
mmHg = torr × ≈1
Worked example: 5 mmHg × ≈1 = ≈5 torr.
Conversion table
| Millimeter of Mercury (mmHg) | Torr (torr) |
|---|---|
| 1 mmHg | ≈1 torr |
| 2 mmHg | ≈2 torr |
| 3 mmHg | ≈3 torr |
| 5 mmHg | ≈5 torr |
| 10 mmHg | ≈10 torr |
| 20 mmHg | ≈20 torr |
| 25 mmHg | ≈25 torr |
| 50 mmHg | ≈50 torr |
| 100 mmHg | ≈100 torr |
| 250 mmHg | ≈250 torr |
| 500 mmHg | ≈500 torr |
| 1,000 mmHg | ≈1,000 torr |
Frequently asked
- How many Torr in a millimeter of mercury?
- 1 mmHg equals ≈1 torr.
- How do I convert Millimeters of Mercury to Torr?
- Multiply the value in mmHg by ≈1 to get torr. The converter above does this instantly as you type.
- Is the conversion exact?
- Yes — Millimeter of Mercury and Torr are both defined by a fixed conversion factor to pressure's base unit (Pa), so the result shown is exact to the precision displayed, not an approximation.