A torr is 1/760 standard atmosphere.
Torrs to mmHgs Converter — Torr to mmHg
Convert Torr (Torr) to mmHg (mmHg) using the exact conversion factor (1 torr = 0.9999998575 mmhg). See the formula, worked examples, and conversion table.
Torrs to mmHgs converter
Converter
Pressure Converter
Convert pascals, bars, PSI, atmospheres, mercury columns, water columns, and engineering pressure units.
Context values
Some unit families need one extra value for a physically accurate result.
Millimeters of mercury at standard gravity.
Result = input x 133.3223684 / 133.3223874.
Pressure uses the pascal as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Torrs to mmHgs
Torr and mmHg both show up on pressure gauges — psi is standard on US tire and tool specifications, while bar is the everyday pressure unit across most of the rest of the world. Specifically: A torr is 1/760 standard atmosphere, and millimeters of mercury at standard gravity.
Formula
mmhgs = torrs × 0.999999857534
This factor comes from each unit's defined relationship to the category's base unit: 1 torr equals 133.322368421 base units, and 1 mmhg equals 133.322387415 base units, so dividing one by the other gives the direct torr-to-mmhg factor of 0.999999857534.
Simple example
1 Torr × 0.9999998575 = 0.9999998575 mmHg
1 torr = 0.9999998575 mmhgs.
Real-world example
35 Torr × 0.9999998575 = 34.99999501 mmHg
35 torrs = 34.99999501 mmhgs.
Conversion table
| Torr (Torr) | mmHg (mmHg) |
|---|---|
| 1 Torr | 0.9999998575 mmHg |
| 5 Torr | 4.999999288 mmHg |
| 10 Torr | 9.999998575 mmHg |
| 25 Torr | 24.99999644 mmHg |
| 50 Torr | 49.99999288 mmHg |
| 100 Torr | 99.99998575 mmHg |
Reverse conversion: mmHg to Torr
0.9999998575 mmHg × 1.000000142 = 1 Torr
0.9999998575 mmhgs = 1 torrs.
torrs = mmhgs × 1.00000014247
For a page dedicated to this direction, see mmHg to Torr.
Understanding the Torr (Torr)
A torr is 1/760 standard atmosphere.
Understanding the mmHg (mmHg)
Millimeters of mercury at standard gravity.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many mmhgs are in 1 torr?
1 torr equals 0.9999998575 mmhgs, using the exact defined conversion factor rather than an estimate.
How do I convert torr to mmhg?
Multiply the torr value by 0.9999998575. The converter above does this instantly to whatever precision you set.
How do I convert mmhg back to torr?
Use the reverse factor: 1 mmhg equals 1.000000142 torrs. You can also use the swap control in the converter above to flip the direction instantly.
What is a torr?
Torr (Torr) is a unit of pressure.
What is a mmhg?
mmHg (mmHg) is a unit of pressure.
Is the torr to mmhg conversion exact?
Yes. Both torr and mmhg are defined by fixed standards rather than physical artifacts, so the factor of 0.9999998575 used above is exact to as many digits as you choose to display.