Zeptopascal is 1e-21 pascal units.
Zeptopascals to Millipascals Converter — zPa to mPa
Convert Zeptopascal (zPa) to Millipascal (mPa) using the exact conversion factor (1 zeptopascal = 1e-18 millipascal). See the formula, worked examples, and conversion table.
Zeptopascals to Millipascals 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.
Millipascal is 0.001 pascal units.
Result = input x 1e-21 / 0.001.
Pressure uses the pascal as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Zeptopascals to Millipascals
Zeptopascal and Millipascal 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: Zeptopascal is 1e-21 pascal units, and millipascal is 0.001 pascal units.
Formula
millipascals = zeptopascals × 1e-18
This factor comes from each unit's defined relationship to the category's base unit: 1 zeptopascal equals 1e-21 base units, and 1 millipascal equals 0.001 base units, so dividing one by the other gives the direct zeptopascal-to-millipascal factor of 1e-18.
Simple example
1 zPa × 1e-18 = 1e-18 mPa
1 zeptopascal = 1e-18 millipascals.
Real-world example
35 zPa × 1e-18 = 3.5e-17 mPa
35 zeptopascals = 3.5e-17 millipascals.
Conversion table
| Zeptopascal (zPa) | Millipascal (mPa) |
|---|---|
| 1 zPa | 1e-18 mPa |
| 5 zPa | 5e-18 mPa |
| 10 zPa | 1e-17 mPa |
| 25 zPa | 2.5e-17 mPa |
| 50 zPa | 5e-17 mPa |
| 100 zPa | 1e-16 mPa |
Reverse conversion: Millipascal to Zeptopascal
1e-18 mPa × 1e+18 = 1 zPa
1e-18 millipascals = 1 zeptopascals.
zeptopascals = millipascals × 1e+18
For a page dedicated to this direction, see Millipascal to Zeptopascal.
Understanding the Zeptopascal (zPa)
Zeptopascal is 1e-21 pascal units.
Understanding the Millipascal (mPa)
Millipascal is 0.001 pascal units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many millipascals are in 1 zeptopascal?
1 zeptopascal equals 1e-18 millipascals, using the exact defined conversion factor rather than an estimate.
How do I convert zeptopascal to millipascal?
Multiply the zeptopascal value by 1e-18. The converter above does this instantly to whatever precision you set.
How do I convert millipascal back to zeptopascal?
Use the reverse factor: 1 millipascal equals 1e+18 zeptopascals. You can also use the swap control in the converter above to flip the direction instantly.
What is a zeptopascal?
Zeptopascal (zPa) is a unit of pressure.
What is a millipascal?
Millipascal (mPa) is a unit of pressure.
Is the zeptopascal to millipascal conversion exact?
Yes. Both zeptopascal and millipascal are defined by fixed standards rather than physical artifacts, so the factor of 1e-18 used above is exact to as many digits as you choose to display.