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