Attopascal is 1e-18 pascal units.
Attopascals to Kilopascals Converter — aPa to kPa
Convert Attopascal (aPa) to Kilopascal (kPa) using the exact conversion factor (1 attopascal = 1e-21 kilopascal). See the formula, worked examples, and conversion table.
Attopascals to Kilopascals 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.
Kilopascal is 1000 pascal units.
Result = input x 1e-18 / 1000.
Pressure uses the pascal as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Attopascals to Kilopascals
Attopascal and Kilopascal 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 kilopascal is 1000 pascal units.
Formula
kilopascals = attopascals × 1e-21
This factor comes from each unit's defined relationship to the category's base unit: 1 attopascal equals 1e-18 base units, and 1 kilopascal equals 1000 base units, so dividing one by the other gives the direct attopascal-to-kilopascal factor of 1e-21.
Simple example
1 aPa × 1e-21 = 1e-21 kPa
1 attopascal = 1e-21 kilopascals.
Real-world example
35 aPa × 1e-21 = 3.5e-20 kPa
35 attopascals = 3.5e-20 kilopascals.
Conversion table
| Attopascal (aPa) | Kilopascal (kPa) |
|---|---|
| 1 aPa | 1e-21 kPa |
| 5 aPa | 5e-21 kPa |
| 10 aPa | 1e-20 kPa |
| 25 aPa | 2.5e-20 kPa |
| 50 aPa | 5e-20 kPa |
| 100 aPa | 1e-19 kPa |
Reverse conversion: Kilopascal to Attopascal
1e-21 kPa × 1e+21 = 1 aPa
1e-21 kilopascals = 1 attopascals.
attopascals = kilopascals × 1e+21
For a page dedicated to this direction, see Kilopascal to Attopascal.
Understanding the Attopascal (aPa)
Attopascal is 1e-18 pascal units.
Understanding the Kilopascal (kPa)
Kilopascal is 1000 pascal units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many kilopascals are in 1 attopascal?
1 attopascal equals 1e-21 kilopascals, using the exact defined conversion factor rather than an estimate.
How do I convert attopascal to kilopascal?
Multiply the attopascal value by 1e-21. The converter above does this instantly to whatever precision you set.
How do I convert kilopascal back to attopascal?
Use the reverse factor: 1 kilopascal equals 1e+21 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 kilopascal?
Kilopascal (kPa) is a unit of pressure.
Is the attopascal to kilopascal conversion exact?
Yes. Both attopascal and kilopascal 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.