Attopascal is 1e-18 pascal units.
Attopascals to Femtopascals Converter — aPa to fPa
Convert Attopascal (aPa) to Femtopascal (fPa) using the exact conversion factor (1 attopascal = 0.001 femtopascal). See the formula, worked examples, and conversion table.
Attopascals to Femtopascals 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.
Femtopascal is 1e-15 pascal units.
Result = input x 1e-18 / 1e-15.
Stress Pressure units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Attopascals to Femtopascals
Attopascal and Femtopascal 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: Attopascal is 1e-18 pascal units, and femtopascal is 1e-15 pascal units.
Formula
femtopascals = attopascals × 0.001
This factor comes from each unit's defined relationship to the category's base unit: 1 attopascal equals 1e-18 base units, and 1 femtopascal equals 1e-15 base units, so dividing one by the other gives the direct attopascal-to-femtopascal factor of 0.001.
Simple example
1 aPa × 0.001 = 0.001 fPa
1 attopascal = 0.001 femtopascals.
Real-world example
100 aPa × 0.001 = 0.1 fPa
100 attopascals = 0.1 femtopascals.
Conversion table
| Attopascal (aPa) | Femtopascal (fPa) |
|---|---|
| 1 aPa | 0.001 fPa |
| 10 aPa | 0.01 fPa |
| 50 aPa | 0.05 fPa |
| 100 aPa | 0.1 fPa |
| 500 aPa | 0.5 fPa |
| 1,000 aPa | 1 fPa |
Reverse conversion: Femtopascal to Attopascal
0.001 fPa × 1000 = 1 aPa
0.001 femtopascals = 1 attopascal.
attopascals = femtopascals × 1000
For a page dedicated to this direction, see Femtopascal to Attopascal.
Understanding the Attopascal (aPa)
Attopascal is 1e-18 pascal units.
Understanding the Femtopascal (fPa)
Femtopascal is 1e-15 pascal units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many femtopascals are in 1 attopascal?
1 attopascal equals 0.001 femtopascals, using the exact defined conversion factor rather than an estimate.
How do I convert attopascal to femtopascal?
Multiply the attopascal value by 0.001. The converter above does this instantly to whatever precision you set.
How do I convert femtopascal back to attopascal?
Use the reverse factor: 1 femtopascal equals 1,000 attopascals. You can also use the swap control in the converter above to flip the direction instantly.
What is a attopascal?
Attopascal (aPa) is a unit of engineering.
What is a femtopascal?
Femtopascal (fPa) is a unit of engineering.
Is the attopascal to femtopascal conversion exact?
Yes. Both attopascal and femtopascal are defined by fixed standards rather than physical artifacts, so the factor of 0.001 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.