Millimeters of mercury at standard gravity.
mmHgs to Attopascals Converter — mmHg to aPa
Convert mmHg (mmHg) to Attopascal (aPa) using the exact conversion factor (1 mmhg = 1.333224e+20 attopascal). See the formula, worked examples, and conversion table.
mmHgs to Attopascals 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.
Attopascal is 1e-18 pascal units.
Result = input x 133.3223874 / 1e-18.
Stress Pressure units are compatible.
Reserved above the conversion cards and below the converter.
About Converting mmHgs to Attopascals
mmHg and Attopascal 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 attopascal is 1e-18 pascal units.
Formula
attopascals = mmhgs × 1.333224e+20
This factor comes from each unit's defined relationship to the category's base unit: 1 mmhg equals 133.322387415 base units, and 1 attopascal equals 1e-18 base units, so dividing one by the other gives the direct mmhg-to-attopascal factor of 1.333224e+20.
Simple example
1 mmHg × 1.333224e+20 = 1.333224e+20 aPa
1 mmhg = 1.333224e+20 attopascals.
Real-world example
100 mmHg × 1.333224e+20 = 1.333224e+22 aPa
100 mmhgs = 1.333224e+22 attopascals.
Conversion table
| mmHg (mmHg) | Attopascal (aPa) |
|---|---|
| 1 mmHg | 1.333224e+20 aPa |
| 10 mmHg | 1.333224e+21 aPa |
| 50 mmHg | 6.666119e+21 aPa |
| 100 mmHg | 1.333224e+22 aPa |
| 500 mmHg | 6.666119e+22 aPa |
| 1,000 mmHg | 1.333224e+23 aPa |
Reverse conversion: Attopascal to mmHg
1.333224e+20 aPa × 7.500616e-21 = 1.000000094 mmHg
1.333224e+20 attopascals = 1.000000094 mmhgs.
mmhgs = attopascals × 7.500616e-21
For a page dedicated to this direction, see Attopascal to mmHg.
Understanding the mmHg (mmHg)
Millimeters of mercury at standard gravity.
Understanding the Attopascal (aPa)
Attopascal is 1e-18 pascal units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many attopascals are in 1 mmhg?
1 mmhg equals 1.333224e+20 attopascals, using the exact defined conversion factor rather than an estimate.
How do I convert mmhg to attopascal?
Multiply the mmhg value by 1.333224e+20. The converter above does this instantly to whatever precision you set.
How do I convert attopascal back to mmhg?
Use the reverse factor: 1 attopascal equals 7.500616e-21 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 attopascal?
Attopascal (aPa) is a unit of engineering.
Is the mmhg to attopascal conversion exact?
Yes. Both mmhg and attopascal are defined by fixed standards rather than physical artifacts, so the factor of 1.333224e+20 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.