The pascal is one newton per square meter.
Pascals to Zeptopascals Converter — Pa to zPa
Convert Pascal (Pa) to Zeptopascal (zPa) using the exact conversion factor (1 pascal = 1e+21 zeptopascal). See the formula, worked examples, conversion table, history, and common uses.
Pascals 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 1 / 1e-21.
Pressure uses the pascal as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Pascals to Zeptopascals
Pascal 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. Pascal is most often used for scientific and engineering pressure measurement worldwide.
Formula
zeptopascals = pascals × 1e+21
This factor comes from each unit's defined relationship to the category's base unit: 1 pascal equals 1 base unit, and 1 zeptopascal equals 1e-21 base units, so dividing one by the other gives the direct pascal-to-zeptopascal factor of 1e+21.
Simple example
1 Pa × 1e+21 = 1e+21 zPa
1 pascal = 1e+21 zeptopascals.
Real-world example
35 Pa × 1e+21 = 3.5e+22 zPa
35 pascals = 3.5e+22 zeptopascals.
Conversion table
| Pascal (Pa) | Zeptopascal (zPa) |
|---|---|
| 1 Pa | 1e+21 zPa |
| 5 Pa | 5e+21 zPa |
| 10 Pa | 1e+22 zPa |
| 25 Pa | 2.5e+22 zPa |
| 50 Pa | 5e+22 zPa |
| 100 Pa | 1e+23 zPa |
Reverse conversion: Zeptopascal to Pascal
1e+21 zPa × 1e-21 = 1 Pa
1e+21 zeptopascals = 1 pascals.
pascals = zeptopascals × 1e-21
For a page dedicated to this direction, see Zeptopascal to Pascal.
Understanding the Pascal
Pascal (Pa) measures pressure. The pascal is the SI derived unit of pressure: one newton of force per square meter. It is classified as a SI derived unit.
Where it's used: Standard scientific pressure unit worldwide
Uses of the Pascal today
- Scientific and engineering pressure measurement worldwide
- Meteorology (often as hectopascals, equivalent to millibars)
- Material science (stress and strength, typically in megapascals)
History of the Pascal
The pascal is named after Blaise Pascal, whose 17th-century experiments clarified the physics of fluid pressure and vacuum. It was adopted as the SI derived unit of pressure in 1971, replacing the older, non-coherent CGS pressure units used in much scientific work up to that point.
Historical origin. Pascal was not the invention of a single named person; it developed through the process described above.
Understanding the Zeptopascal (zPa)
Zeptopascal is 1e-21 pascal units.
Pascal — sources
- BIPM SI Brochure — Coherent derived units — Defines the pascal as the SI unit of pressure.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many zeptopascals are in 1 pascal?
1 pascal equals 1e+21 zeptopascals, using the exact defined conversion factor rather than an estimate.
How do I convert pascal to zeptopascal?
Multiply the pascal value by 1e+21. The converter above does this instantly to whatever precision you set.
How do I convert zeptopascal back to pascal?
Use the reverse factor: 1 zeptopascal equals 1e-21 pascals. You can also use the swap control in the converter above to flip the direction instantly.
What is a pascal?
Pascal (Pa) measures pressure. The pascal is the SI derived unit of pressure: one newton of force per square meter. It is classified as a SI derived unit.
What is a zeptopascal?
Zeptopascal (zPa) is a unit of pressure.
Is the pascal to zeptopascal conversion exact?
Yes. Both pascal and zeptopascal are defined by fixed standards rather than physical artifacts, so the factor of 1e+21 used above is exact to as many digits as you choose to display.
Where is the pascal still used today?
Standard scientific pressure unit worldwide