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
Engineering Converter
Convert common stress, force, torque, power, and energy units used in engineering.
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.
Stress Pressure units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Torrs to mmHgs
Torr and mmHg both measure a quantity used in structural or mechanical engineering — commonly stress, pressure, force, torque, power, or energy — where converting between the unit conventions used in different regions, industries, or equipment specifications is a routine part of design work. 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
100 Torr × 0.9999998575 = 99.99998575 mmHg
100 torrs = 99.99998575 mmhgs.
Conversion table
| Torr (Torr) | mmHg (mmHg) |
|---|---|
| 1 Torr | 0.9999998575 mmHg |
| 10 Torr | 9.999998575 mmHg |
| 50 Torr | 49.99999288 mmHg |
| 100 Torr | 99.99998575 mmHg |
| 500 Torr | 499.9999288 mmHg |
| 1,000 Torr | 999.9998575 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 engineering.
What is a mmhg?
mmHg (mmHg) is a unit of engineering.
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.
Why do engineering unit conventions vary so much by region and industry?
Pressure, force, and stress can be expressed in metric (pascal, newton), US customary (psi, pound-force), or older and industry-specific units (atmosphere, torr, kip) depending on the country, industry, and even the equipment manufacturer, which is why engineers routinely need to convert between them when working across specs from different sources.