Microwatt is 0.000001 watt units.
Microwatts to Femtowatts Converter — uW to fW
Convert Microwatt (uW) to Femtowatt (fW) using the exact conversion factor (1 microwatt = 1,000,000,000 femtowatt). See the formula, worked examples, and conversion table.
Microwatts 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-6 / 1e-15.
Electrical units in the same family convert directly.
Reserved above the conversion cards and below the converter.
About Converting Microwatts to Femtowatts
Microwatt 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: Microwatt is 0.000001 watt units, and femtowatt is 1e-15 watt units.
Formula
femtowatts = microwatts × 1000000000
This factor comes from each unit's defined relationship to the category's base unit: 1 microwatt equals 0.000001 base units, and 1 femtowatt equals 1e-15 base units, so dividing one by the other gives the direct microwatt-to-femtowatt factor of 1000000000.
Simple example
1 uW × 1000000000 = 1,000,000,000 fW
1 microwatt = 1,000,000,000 femtowatts.
Real-world example
120 uW × 1000000000 = 120,000,000,000 fW
120 microwatts = 120,000,000,000 femtowatts.
Conversion table
| Microwatt (uW) | Femtowatt (fW) |
|---|---|
| 1 uW | 1,000,000,000 fW |
| 5 uW | 5,000,000,000 fW |
| 12 uW | 12,000,000,000 fW |
| 24 uW | 24,000,000,000 fW |
| 120 uW | 120,000,000,000 fW |
| 240 uW | 240,000,000,000 fW |
Reverse conversion: Femtowatt to Microwatt
1 fW × 1e-9 = 1e-9 uW
1 femtowatt = 1e-9 microwatts.
microwatts = femtowatts × 1e-9
For a page dedicated to this direction, see Femtowatt to Microwatt.
Understanding the Microwatt (uW)
Microwatt is 0.000001 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 microwatt?
1 microwatt equals 1,000,000,000 femtowatts, using the exact defined conversion factor rather than an estimate.
How do I convert microwatt to femtowatt?
Multiply the microwatt value by 1000000000. The converter above does this instantly to whatever precision you set.
How do I convert femtowatt back to microwatt?
Use the reverse factor: 1 femtowatt equals 1e-9 microwatts. You can also use the swap control in the converter above to flip the direction instantly.
What is a microwatt?
Microwatt (uW) is a unit of electricity.
What is a femtowatt?
Femtowatt (fW) is a unit of electricity.
Is the microwatt to femtowatt conversion exact?
Yes. Both microwatt and femtowatt 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.
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.