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
Electricity Converter
Convert electrical units by family and calculate voltage, current, resistance, power, and energy with context values.
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.
Electrical units in the same family convert directly.
Reserved above the conversion cards and below the converter.
About Converting Attowatts to Femtowatts
Attowatt and Femtowatt both belong to the electricity family — voltage, current, resistance, power, or energy — units that show up constantly when working across the different standards used by household wiring (120V/240V depending on region), automotive electrical systems (12V/24V), and electronics design. 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
120 aW × 0.001 = 0.12 fW
120 attowatts = 0.12 femtowatts.
Conversion table
| Attowatt (aW) | Femtowatt (fW) |
|---|---|
| 1 aW | 0.001 fW |
| 5 aW | 0.005 fW |
| 12 aW | 0.012 fW |
| 24 aW | 0.024 fW |
| 120 aW | 0.12 fW |
| 240 aW | 0.24 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 electricity.
What is a femtowatt?
Femtowatt (fW) is a unit of electricity.
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.
What's the difference between voltage, current, and resistance?
Voltage (volts) is the electrical potential difference driving current through a circuit. Current (amperes) is the rate of flow of electric charge. Resistance (ohms) is how much a component opposes that flow. They're related by Ohm's law (V = I × R), but they are distinct physical quantities, and this page converts between units of just one of them.