Attopascal is 1e-18 pascal units.
Attopascals to Zeptopascals Converter — aPa to zPa
Convert Attopascal (aPa) to Zeptopascal (zPa) using the exact conversion factor (1 attopascal = 1,000 zeptopascal). See the formula, worked examples, and conversion table.
Attopascals to Zeptopascals 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.
Zeptopascal is 1e-21 pascal units.
Result = input x 1e-18 / 1e-21.
Pressure uses the pascal as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Attopascals to Zeptopascals
Attopascal and Zeptopascal 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: Attopascal is 1e-18 pascal units, and zeptopascal is 1e-21 pascal units.
Formula
zeptopascals = attopascals × 1000
This factor comes from each unit's defined relationship to the category's base unit: 1 attopascal equals 1e-18 base units, and 1 zeptopascal equals 1e-21 base units, so dividing one by the other gives the direct attopascal-to-zeptopascal factor of 1000.
Simple example
1 aPa × 1000 = 1,000 zPa
1 attopascal = 1,000 zeptopascals.
Real-world example
35 aPa × 1000 = 35,000 zPa
35 attopascals = 35,000 zeptopascals.
Conversion table
| Attopascal (aPa) | Zeptopascal (zPa) |
|---|---|
| 1 aPa | 1,000 zPa |
| 5 aPa | 5,000 zPa |
| 10 aPa | 10,000 zPa |
| 25 aPa | 25,000 zPa |
| 50 aPa | 50,000 zPa |
| 100 aPa | 100,000 zPa |
Reverse conversion: Zeptopascal to Attopascal
1 zPa × 0.001 = 0.001 aPa
1 zeptopascal = 0.001 attopascals.
attopascals = zeptopascals × 0.001
For a page dedicated to this direction, see Zeptopascal to Attopascal.
Understanding the Attopascal (aPa)
Attopascal is 1e-18 pascal units.
Understanding the Zeptopascal (zPa)
Zeptopascal is 1e-21 pascal units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many zeptopascals are in 1 attopascal?
1 attopascal equals 1,000 zeptopascals, using the exact defined conversion factor rather than an estimate.
How do I convert attopascal to zeptopascal?
Multiply the attopascal value by 1000. The converter above does this instantly to whatever precision you set.
How do I convert zeptopascal back to attopascal?
Use the reverse factor: 1 zeptopascal equals 0.001 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 pressure.
What is a zeptopascal?
Zeptopascal (zPa) is a unit of pressure.
Is the attopascal to zeptopascal conversion exact?
Yes. Both attopascal and zeptopascal are defined by fixed standards rather than physical artifacts, so the factor of 1000 used above is exact to as many digits as you choose to display.