Terawatt is 1000000000000 watt units.
Terawatts to Femtowatts Converter — TW to fW
Convert Terawatt (TW) to Femtowatt (fW) using the exact conversion factor (1 terawatt = 1e+27 femtowatt). See the formula, worked examples, and conversion table.
Terawatts to Femtowatts converter
Converter
Power Converter
Convert watts, horsepower, refrigeration tons, BTU per hour, and engineering power units.
Context values
Some unit families need one extra value for a physically accurate result.
Femtowatt is 1e-15 watt units.
Result = input x 1e+12 / 1e-15.
Power uses the watt as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Terawatts to Femtowatts
Terawatt and Femtowatt both describe power output, and the conversion is a routine part of comparing an engine or motor's spec sheet across countries that use different power units. Specifically: Terawatt is 1000000000000 watt units, and femtowatt is 1e-15 watt units.
Formula
femtowatts = terawatts × 1e+27
This factor comes from each unit's defined relationship to the category's base unit: 1 terawatt equals 1e+12 base units, and 1 femtowatt equals 1e-15 base units, so dividing one by the other gives the direct terawatt-to-femtowatt factor of 1e+27.
Simple example
1 TW × 1e+27 = 1e+27 fW
1 terawatt = 1e+27 femtowatts.
Real-world example
100 TW × 1e+27 = 1e+29 fW
100 terawatts = 1e+29 femtowatts.
Conversion table
| Terawatt (TW) | Femtowatt (fW) |
|---|---|
| 1 TW | 1e+27 fW |
| 10 TW | 1e+28 fW |
| 100 TW | 1e+29 fW |
| 500 TW | 5e+29 fW |
| 1,000 TW | 1e+30 fW |
| 5,000 TW | 5e+30 fW |
Reverse conversion: Femtowatt to Terawatt
1e+27 fW × 1e-27 = 1 TW
1e+27 femtowatts = 1 terawatts.
terawatts = femtowatts × 1e-27
For a page dedicated to this direction, see Femtowatt to Terawatt.
Understanding the Terawatt (TW)
Terawatt is 1000000000000 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 terawatt?
1 terawatt equals 1e+27 femtowatts, using the exact defined conversion factor rather than an estimate.
How do I convert terawatt to femtowatt?
Multiply the terawatt value by 1e+27. The converter above does this instantly to whatever precision you set.
How do I convert femtowatt back to terawatt?
Use the reverse factor: 1 femtowatt equals 1e-27 terawatts. You can also use the swap control in the converter above to flip the direction instantly.
What is a terawatt?
Terawatt (TW) is a unit of power.
What is a femtowatt?
Femtowatt (fW) is a unit of power.
Is the terawatt to femtowatt conversion exact?
Yes. Both terawatt and femtowatt are defined by fixed standards rather than physical artifacts, so the factor of 1e+27 used above is exact to as many digits as you choose to display.