Femtowatt is 1e-15 watt units.
Femtowatts to Nanowatts Converter — fW to nW
Convert Femtowatt (fW) to Nanowatt (nW) using the exact conversion factor (1 femtowatt = 0.000001 nanowatt). See the formula, worked examples, and conversion table.
Femtowatts to Nanowatts 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.
Nanowatt is 1e-9 watt units.
Result = input x 1e-15 / 1e-9.
Electrical units in the same family convert directly.
Reserved above the conversion cards and below the converter.
About Converting Femtowatts to Nanowatts
Femtowatt and Nanowatt 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: Femtowatt is 1e-15 watt units, and nanowatt is 1e-9 watt units.
Formula
nanowatts = femtowatts × 0.000001
This factor comes from each unit's defined relationship to the category's base unit: 1 femtowatt equals 1e-15 base units, and 1 nanowatt equals 1e-9 base units, so dividing one by the other gives the direct femtowatt-to-nanowatt factor of 0.000001.
Simple example
1 fW × 0.000001 = 0.000001 nW
1 femtowatt = 0.000001 nanowatts.
Real-world example
120 fW × 0.000001 = 0.00012 nW
120 femtowatts = 0.00012 nanowatts.
Conversion table
| Femtowatt (fW) | Nanowatt (nW) |
|---|---|
| 1 fW | 0.000001 nW |
| 5 fW | 0.000005 nW |
| 12 fW | 0.000012 nW |
| 24 fW | 0.000024 nW |
| 120 fW | 0.00012 nW |
| 240 fW | 0.00024 nW |
Reverse conversion: Nanowatt to Femtowatt
0.000001 nW × 1000000 = 1 fW
0.000001 nanowatts = 1 femtowatt.
femtowatts = nanowatts × 1000000
For a page dedicated to this direction, see Nanowatt to Femtowatt.
Understanding the Femtowatt (fW)
Femtowatt is 1e-15 watt units.
Understanding the Nanowatt (nW)
Nanowatt is 1e-9 watt units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many nanowatts are in 1 femtowatt?
1 femtowatt equals 0.000001 nanowatts, using the exact defined conversion factor rather than an estimate.
How do I convert femtowatt to nanowatt?
Multiply the femtowatt value by 0.000001. The converter above does this instantly to whatever precision you set.
How do I convert nanowatt back to femtowatt?
Use the reverse factor: 1 nanowatt equals 1,000,000 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 electricity.
What is a nanowatt?
Nanowatt (nW) is a unit of electricity.
Is the femtowatt to nanowatt conversion exact?
Yes. Both femtowatt and nanowatt are defined by fixed standards rather than physical artifacts, so the factor of 0.000001 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.