A torr is 1/760 standard atmosphere.
Torrs to Attopascals Converter — Torr to aPa
Convert Torr (Torr) to Attopascal (aPa) using the exact conversion factor (1 torr = 1.333224e+20 attopascal). See the formula, worked examples, and conversion table.
Torrs 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 133.3223684 / 1e-18.
Pressure uses the pascal as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Torrs to Attopascals
Torr 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: A torr is 1/760 standard atmosphere, and attopascal is 1e-18 pascal units.
Formula
attopascals = torrs × 1.333224e+20
This factor comes from each unit's defined relationship to the category's base unit: 1 torr equals 133.322368421 base units, and 1 attopascal equals 1e-18 base units, so dividing one by the other gives the direct torr-to-attopascal factor of 1.333224e+20.
Simple example
1 Torr × 1.333224e+20 = 1.333224e+20 aPa
1 torr = 1.333224e+20 attopascals.
Real-world example
35 Torr × 1.333224e+20 = 4.666283e+21 aPa
35 torrs = 4.666283e+21 attopascals.
Conversion table
| Torr (Torr) | Attopascal (aPa) |
|---|---|
| 1 Torr | 1.333224e+20 aPa |
| 5 Torr | 6.666118e+20 aPa |
| 10 Torr | 1.333224e+21 aPa |
| 25 Torr | 3.333059e+21 aPa |
| 50 Torr | 6.666118e+21 aPa |
| 100 Torr | 1.333224e+22 aPa |
Reverse conversion: Attopascal to Torr
1.333224e+20 aPa × 7.500617e-21 = 1.000000237 Torr
1.333224e+20 attopascals = 1.000000237 torrs.
torrs = attopascals × 7.500617e-21
For a page dedicated to this direction, see Attopascal to Torr.
Understanding the Torr (Torr)
A torr is 1/760 standard atmosphere.
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 torr?
1 torr equals 1.333224e+20 attopascals, using the exact defined conversion factor rather than an estimate.
How do I convert torr to attopascal?
Multiply the torr value by 1.333224e+20. The converter above does this instantly to whatever precision you set.
How do I convert attopascal back to torr?
Use the reverse factor: 1 attopascal equals 7.500617e-21 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 attopascal?
Attopascal (aPa) is a unit of pressure.
Is the torr to attopascal conversion exact?
Yes. Both torr 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.