Attowatt is 1e-18 watt units.
Attowatts to Zettawatts Converter — aW to ZW
Convert Attowatt (aW) to Zettawatt (ZW) using the exact conversion factor (1 attowatt = 1e-39 zettawatt). See the formula, worked examples, and conversion table.
Attowatts to Zettawatts converter
Converter
Power Converter
Convert watts, horsepower, refrigeration tons, BTU per hour, and engineering power units.
Context values
Some unit families need one extra value for a physically accurate result.
Zettawatt is 1e+21 watt units.
Result = input x 1e-18 / 1e+21.
Power uses the watt as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Attowatts to Zettawatts
Attowatt and Zettawatt both describe power output, and the conversion is a routine part of comparing an engine or motor's spec sheet across countries that use different power units. Specifically: Attowatt is 1e-18 watt units, and zettawatt is 1e+21 watt units.
Formula
zettawatts = attowatts × 1e-39
This factor comes from each unit's defined relationship to the category's base unit: 1 attowatt equals 1e-18 base units, and 1 zettawatt equals 1e+21 base units, so dividing one by the other gives the direct attowatt-to-zettawatt factor of 1e-39.
Simple example
1 aW × 1e-39 = 1e-39 ZW
1 attowatt = 1e-39 zettawatts.
Real-world example
100 aW × 1e-39 = 1e-37 ZW
100 attowatts = 1e-37 zettawatts.
Conversion table
| Attowatt (aW) | Zettawatt (ZW) |
|---|---|
| 1 aW | 1e-39 ZW |
| 10 aW | 1e-38 ZW |
| 100 aW | 1e-37 ZW |
| 500 aW | 5e-37 ZW |
| 1,000 aW | 1e-36 ZW |
| 5,000 aW | 5e-36 ZW |
Reverse conversion: Zettawatt to Attowatt
1e-39 ZW × 1e+39 = 1 aW
1e-39 zettawatts = 1 attowatts.
attowatts = zettawatts × 1e+39
For a page dedicated to this direction, see Zettawatt to Attowatt.
Understanding the Attowatt (aW)
Attowatt is 1e-18 watt units.
Understanding the Zettawatt (ZW)
Zettawatt is 1e+21 watt units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many zettawatts are in 1 attowatt?
1 attowatt equals 1e-39 zettawatts, using the exact defined conversion factor rather than an estimate.
How do I convert attowatt to zettawatt?
Multiply the attowatt value by 1e-39. The converter above does this instantly to whatever precision you set.
How do I convert zettawatt back to attowatt?
Use the reverse factor: 1 zettawatt equals 1e+39 attowatts. You can also use the swap control in the converter above to flip the direction instantly.
What is a attowatt?
Attowatt (aW) is a unit of power.
What is a zettawatt?
Zettawatt (ZW) is a unit of power.
Is the attowatt to zettawatt conversion exact?
Yes. Both attowatt and zettawatt are defined by fixed standards rather than physical artifacts, so the factor of 1e-39 used above is exact to as many digits as you choose to display.