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
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 133.3223684 / 1e-18.
Stress Pressure units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Torrs to Attopascals
Torr 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: 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
100 Torr × 1.333224e+20 = 1.333224e+22 aPa
100 torrs = 1.333224e+22 attopascals.
Conversion table
| Torr (Torr) | Attopascal (aPa) |
|---|---|
| 1 Torr | 1.333224e+20 aPa |
| 10 Torr | 1.333224e+21 aPa |
| 50 Torr | 6.666118e+21 aPa |
| 100 Torr | 1.333224e+22 aPa |
| 500 Torr | 6.666118e+22 aPa |
| 1,000 Torr | 1.333224e+23 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 engineering.
What is a attopascal?
Attopascal (aPa) is a unit of engineering.
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.
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.