Zeptowatt is 1e-21 watt units.
Zeptowatts to Yoctowatts Converter — zW to yW
Convert Zeptowatt (zW) to Yoctowatt (yW) using the exact conversion factor (1 zeptowatt = 1,000 yoctowatt). See the formula, worked examples, and conversion table.
Zeptowatts to Yoctowatts converter
Converter
Engineering Converter
Convert common stress, force, torque, power, and energy units used in engineering.
Context values
Some unit families need one extra value for a physically accurate result.
Yoctowatt is 1e-24 watt units.
Result = input x 1e-21 / 1e-24.
Power units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Zeptowatts to Yoctowatts
Zeptowatt and Yoctowatt both measure a quantity used in structural or mechanical engineering — commonly stress, pressure, force, torque, power, or energy — where converting between the unit conventions used in different regions, industries, or equipment specifications is a routine part of design work. Specifically: Zeptowatt is 1e-21 watt units, and yoctowatt is 1e-24 watt units.
Formula
yoctowatts = zeptowatts × 1000
This factor comes from each unit's defined relationship to the category's base unit: 1 zeptowatt equals 1e-21 base units, and 1 yoctowatt equals 1e-24 base units, so dividing one by the other gives the direct zeptowatt-to-yoctowatt factor of 1000.
Simple example
1 zW × 1000 = 1,000 yW
1 zeptowatt = 1,000 yoctowatts.
Real-world example
100 zW × 1000 = 100,000 yW
100 zeptowatts = 100,000 yoctowatts.
Conversion table
| Zeptowatt (zW) | Yoctowatt (yW) |
|---|---|
| 1 zW | 1,000 yW |
| 10 zW | 10,000 yW |
| 50 zW | 50,000 yW |
| 100 zW | 100,000 yW |
| 500 zW | 500,000 yW |
| 1,000 zW | 1,000,000 yW |
Reverse conversion: Yoctowatt to Zeptowatt
1 yW × 0.001 = 0.001 zW
1 yoctowatt = 0.001 zeptowatts.
zeptowatts = yoctowatts × 0.001
For a page dedicated to this direction, see Yoctowatt to Zeptowatt.
Understanding the Zeptowatt (zW)
Zeptowatt is 1e-21 watt units.
Understanding the Yoctowatt (yW)
Yoctowatt is 1e-24 watt units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many yoctowatts are in 1 zeptowatt?
1 zeptowatt equals 1,000 yoctowatts, using the exact defined conversion factor rather than an estimate.
How do I convert zeptowatt to yoctowatt?
Multiply the zeptowatt value by 1000. The converter above does this instantly to whatever precision you set.
How do I convert yoctowatt back to zeptowatt?
Use the reverse factor: 1 yoctowatt equals 0.001 zeptowatts. You can also use the swap control in the converter above to flip the direction instantly.
What is a zeptowatt?
Zeptowatt (zW) is a unit of engineering.
What is a yoctowatt?
Yoctowatt (yW) is a unit of engineering.
Is the zeptowatt to yoctowatt conversion exact?
Yes. Both zeptowatt and yoctowatt are defined by fixed standards rather than physical artifacts, so the factor of 1000 used above is exact to as many digits as you choose to display.
Why do engineering unit conventions vary so much by region and industry?
Pressure, force, and stress can be expressed in metric (pascal, newton), US customary (psi, pound-force), or older and industry-specific units (atmosphere, torr, kip) depending on the country, industry, and even the equipment manufacturer, which is why engineers routinely need to convert between them when working across specs from different sources.