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
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.
Attopascal is 1e-18 pascal units.
Result = input x 133.3223874 / 1e-18.
Pressure uses the pascal as the base unit.
Reserved above the conversion cards and below the converter.
About Converting mmHgs to Attopascals
mmHg and Attopascal 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: 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
35 mmHg × 1.333224e+20 = 4.666284e+21 aPa
35 mmhgs = 4.666284e+21 attopascals.
Conversion table
| mmHg (mmHg) | Attopascal (aPa) |
|---|---|
| 1 mmHg | 1.333224e+20 aPa |
| 5 mmHg | 6.666119e+20 aPa |
| 10 mmHg | 1.333224e+21 aPa |
| 25 mmHg | 3.33306e+21 aPa |
| 50 mmHg | 6.666119e+21 aPa |
| 100 mmHg | 1.333224e+22 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 pressure.
What is a attopascal?
Attopascal (aPa) is a unit of pressure.
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.