Millimeters of mercury at standard gravity.
mmHgs to inHgs Converter — mmHg to inHg
Convert mmHg (mmHg) to inHg (inHg) using the exact conversion factor (1 mmhg = 0.0393700746 inhg). See the formula, worked examples, and conversion table.
mmHgs to inHgs 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.
Inches of mercury.
Result = input x 133.3223874 / 3386.389.
Stress Pressure units are compatible.
Reserved above the conversion cards and below the converter.
About Converting mmHgs to inHgs
mmHg and inHg 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: Millimeters of mercury at standard gravity, and inches of mercury.
Formula
inhgs = mmhgs × 0.0393700745588
This factor comes from each unit's defined relationship to the category's base unit: 1 mmhg equals 133.322387415 base units, and 1 inhg equals 3386.389 base units, so dividing one by the other gives the direct mmhg-to-inhg factor of 0.0393700745588.
Simple example
1 mmHg × 0.03937007456 = 0.0393700746 inHg
1 mmhg = 0.0393700746 inhgs.
Real-world example
100 mmHg × 0.03937007456 = 3.937007456 inHg
100 mmhgs = 3.937007456 inhgs.
Conversion table
| mmHg (mmHg) | inHg (inHg) |
|---|---|
| 1 mmHg | 0.0393700746 inHg |
| 10 mmHg | 0.3937007456 inHg |
| 50 mmHg | 1.968503728 inHg |
| 100 mmHg | 3.937007456 inHg |
| 500 mmHg | 19.68503728 inHg |
| 1,000 mmHg | 39.37007456 inHg |
Reverse conversion: inHg to mmHg
0.0393700746 inHg × 25.4000027 = 1.000000001 mmHg
0.0393700746 inhgs = 1.000000001 mmhgs.
mmhgs = inhgs × 25.4000026977
For a page dedicated to this direction, see inHg to mmHg.
Understanding the mmHg (mmHg)
Millimeters of mercury at standard gravity.
Understanding the inHg (inHg)
Inches of mercury.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many inhgs are in 1 mmhg?
1 mmhg equals 0.0393700746 inhgs, using the exact defined conversion factor rather than an estimate.
How do I convert mmhg to inhg?
Multiply the mmhg value by 0.03937007456. The converter above does this instantly to whatever precision you set.
How do I convert inhg back to mmhg?
Use the reverse factor: 1 inhg equals 25.4000027 mmhgs. You can also use the swap control in the converter above to flip the direction instantly.
What is a mmhg?
mmHg (mmHg) is a unit of engineering.
What is a inhg?
inHg (inHg) is a unit of engineering.
Is the mmhg to inhg conversion exact?
Yes. Both mmhg and inhg are defined by fixed standards rather than physical artifacts, so the factor of 0.03937007456 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.