Femtowatt is 1e-15 watt units.
Femtowatts to Yoctowatts Converter — fW to yW
Convert Femtowatt (fW) to Yoctowatt (yW) using the exact conversion factor (1 femtowatt = 1,000,000,000 yoctowatt). See the formula, worked examples, and conversion table.
Femtowatts 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-15 / 1e-24.
Power units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Femtowatts to Yoctowatts
Femtowatt 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: Femtowatt is 1e-15 watt units, and yoctowatt is 1e-24 watt units.
Formula
yoctowatts = femtowatts × 1000000000
This factor comes from each unit's defined relationship to the category's base unit: 1 femtowatt equals 1e-15 base units, and 1 yoctowatt equals 1e-24 base units, so dividing one by the other gives the direct femtowatt-to-yoctowatt factor of 1000000000.
Simple example
1 fW × 1000000000 = 1,000,000,000 yW
1 femtowatt = 1,000,000,000 yoctowatts.
Real-world example
100 fW × 1000000000 = 100,000,000,000 yW
100 femtowatts = 100,000,000,000 yoctowatts.
Conversion table
| Femtowatt (fW) | Yoctowatt (yW) |
|---|---|
| 1 fW | 1,000,000,000 yW |
| 10 fW | 10,000,000,000 yW |
| 50 fW | 50,000,000,000 yW |
| 100 fW | 100,000,000,000 yW |
| 500 fW | 500,000,000,000 yW |
| 1,000 fW | 1e+12 yW |
Reverse conversion: Yoctowatt to Femtowatt
1 yW × 1e-9 = 1e-9 fW
1 yoctowatt = 1e-9 femtowatts.
femtowatts = yoctowatts × 1e-9
For a page dedicated to this direction, see Yoctowatt to Femtowatt.
Understanding the Femtowatt (fW)
Femtowatt is 1e-15 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 femtowatt?
1 femtowatt equals 1,000,000,000 yoctowatts, using the exact defined conversion factor rather than an estimate.
How do I convert femtowatt to yoctowatt?
Multiply the femtowatt value by 1000000000. The converter above does this instantly to whatever precision you set.
How do I convert yoctowatt back to femtowatt?
Use the reverse factor: 1 yoctowatt equals 1e-9 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 engineering.
What is a yoctowatt?
Yoctowatt (yW) is a unit of engineering.
Is the femtowatt to yoctowatt conversion exact?
Yes. Both femtowatt and yoctowatt are defined by fixed standards rather than physical artifacts, so the factor of 1000000000 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.