Yoctowatt is 1e-24 watt units.
Yoctowatts to Zettawatts Converter — yW to ZW
Convert Yoctowatt (yW) to Zettawatt (ZW) using the exact conversion factor (1 yoctowatt = 1e-45 zettawatt). See the formula, worked examples, and conversion table.
Yoctowatts 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-24 / 1e+21.
Power uses the watt as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Yoctowatts to Zettawatts
Yoctowatt 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: Yoctowatt is 1e-24 watt units, and zettawatt is 1e+21 watt units.
Formula
zettawatts = yoctowatts × 1e-45
This factor comes from each unit's defined relationship to the category's base unit: 1 yoctowatt equals 1e-24 base units, and 1 zettawatt equals 1e+21 base units, so dividing one by the other gives the direct yoctowatt-to-zettawatt factor of 1e-45.
Simple example
1 yW × 1e-45 = 1e-45 ZW
1 yoctowatt = 1e-45 zettawatts.
Real-world example
100 yW × 1e-45 = 1e-43 ZW
100 yoctowatts = 1e-43 zettawatts.
Conversion table
| Yoctowatt (yW) | Zettawatt (ZW) |
|---|---|
| 1 yW | 1e-45 ZW |
| 10 yW | 1e-44 ZW |
| 100 yW | 1e-43 ZW |
| 500 yW | 5e-43 ZW |
| 1,000 yW | 1e-42 ZW |
| 5,000 yW | 5e-42 ZW |
Reverse conversion: Zettawatt to Yoctowatt
1e-45 ZW × 1e+45 = 1 yW
1e-45 zettawatts = 1 yoctowatt.
yoctowatts = zettawatts × 1e+45
For a page dedicated to this direction, see Zettawatt to Yoctowatt.
Understanding the Yoctowatt (yW)
Yoctowatt is 1e-24 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 yoctowatt?
1 yoctowatt equals 1e-45 zettawatts, using the exact defined conversion factor rather than an estimate.
How do I convert yoctowatt to zettawatt?
Multiply the yoctowatt value by 1e-45. The converter above does this instantly to whatever precision you set.
How do I convert zettawatt back to yoctowatt?
Use the reverse factor: 1 zettawatt equals 1e+45 yoctowatts. You can also use the swap control in the converter above to flip the direction instantly.
What is a yoctowatt?
Yoctowatt (yW) is a unit of power.
What is a zettawatt?
Zettawatt (ZW) is a unit of power.
Is the yoctowatt to zettawatt conversion exact?
Yes. Both yoctowatt and zettawatt are defined by fixed standards rather than physical artifacts, so the factor of 1e-45 used above is exact to as many digits as you choose to display.