Attowatt is 1e-18 watt units.
Attowatts to Femtowatts Converter — aW to fW
Convert Attowatt (aW) to Femtowatt (fW) using the exact conversion factor (1 attowatt = 0.001 femtowatt). See the formula, worked examples, and conversion table.
Attowatts to Femtowatts 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.
Femtowatt is 1e-15 watt units.
Result = input x 1e-18 / 1e-15.
Power units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Attowatts to Femtowatts
Attowatt and Femtowatt 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: Attowatt is 1e-18 watt units, and femtowatt is 1e-15 watt units.
Formula
femtowatts = attowatts × 0.001
This factor comes from each unit's defined relationship to the category's base unit: 1 attowatt equals 1e-18 base units, and 1 femtowatt equals 1e-15 base units, so dividing one by the other gives the direct attowatt-to-femtowatt factor of 0.001.
Simple example
1 aW × 0.001 = 0.001 fW
1 attowatt = 0.001 femtowatts.
Real-world example
100 aW × 0.001 = 0.1 fW
100 attowatts = 0.1 femtowatts.
Conversion table
| Attowatt (aW) | Femtowatt (fW) |
|---|---|
| 1 aW | 0.001 fW |
| 10 aW | 0.01 fW |
| 50 aW | 0.05 fW |
| 100 aW | 0.1 fW |
| 500 aW | 0.5 fW |
| 1,000 aW | 1 fW |
Reverse conversion: Femtowatt to Attowatt
0.001 fW × 1000 = 1 aW
0.001 femtowatts = 1 attowatt.
attowatts = femtowatts × 1000
For a page dedicated to this direction, see Femtowatt to Attowatt.
Understanding the Attowatt (aW)
Attowatt is 1e-18 watt units.
Understanding the Femtowatt (fW)
Femtowatt is 1e-15 watt units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many femtowatts are in 1 attowatt?
1 attowatt equals 0.001 femtowatts, using the exact defined conversion factor rather than an estimate.
How do I convert attowatt to femtowatt?
Multiply the attowatt value by 0.001. The converter above does this instantly to whatever precision you set.
How do I convert femtowatt back to attowatt?
Use the reverse factor: 1 femtowatt equals 1,000 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 engineering.
What is a femtowatt?
Femtowatt (fW) is a unit of engineering.
Is the attowatt to femtowatt conversion exact?
Yes. Both attowatt and femtowatt are defined by fixed standards rather than physical artifacts, so the factor of 0.001 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.