Femtowatt is 1e-15 watt units.
Femtowatts to Zettawatts Converter — fW to ZW
Convert Femtowatt (fW) to Zettawatt (ZW) using the exact conversion factor (1 femtowatt = 1e-36 zettawatt). See the formula, worked examples, and conversion table.
Femtowatts 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-15 / 1e+21.
Power uses the watt as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Femtowatts to Zettawatts
Femtowatt 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: Femtowatt is 1e-15 watt units, and zettawatt is 1e+21 watt units.
Formula
zettawatts = femtowatts × 1e-36
This factor comes from each unit's defined relationship to the category's base unit: 1 femtowatt equals 1e-15 base units, and 1 zettawatt equals 1e+21 base units, so dividing one by the other gives the direct femtowatt-to-zettawatt factor of 1e-36.
Simple example
1 fW × 1e-36 = 1e-36 ZW
1 femtowatt = 1e-36 zettawatts.
Real-world example
100 fW × 1e-36 = 1e-34 ZW
100 femtowatts = 1e-34 zettawatts.
Conversion table
| Femtowatt (fW) | Zettawatt (ZW) |
|---|---|
| 1 fW | 1e-36 ZW |
| 10 fW | 1e-35 ZW |
| 100 fW | 1e-34 ZW |
| 500 fW | 5e-34 ZW |
| 1,000 fW | 1e-33 ZW |
| 5,000 fW | 5e-33 ZW |
Reverse conversion: Zettawatt to Femtowatt
1e-36 ZW × 1e+36 = 1 fW
1e-36 zettawatts = 1 femtowatts.
femtowatts = zettawatts × 1e+36
For a page dedicated to this direction, see Zettawatt to Femtowatt.
Understanding the Femtowatt (fW)
Femtowatt is 1e-15 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 femtowatt?
1 femtowatt equals 1e-36 zettawatts, using the exact defined conversion factor rather than an estimate.
How do I convert femtowatt to zettawatt?
Multiply the femtowatt value by 1e-36. The converter above does this instantly to whatever precision you set.
How do I convert zettawatt back to femtowatt?
Use the reverse factor: 1 zettawatt equals 1e+36 femtowatts. You can also use the swap control in the converter above to flip the direction instantly.
What is a femtowatt?
Femtowatt (fW) is a unit of power.
What is a zettawatt?
Zettawatt (ZW) is a unit of power.
Is the femtowatt to zettawatt conversion exact?
Yes. Both femtowatt and zettawatt are defined by fixed standards rather than physical artifacts, so the factor of 1e-36 used above is exact to as many digits as you choose to display.