Femtowatt is 1e-15 watt units.
Femtowatts to Rontowatts Converter — fW to rW
Convert Femtowatt (fW) to Rontowatt (rW) using the exact conversion factor (1 femtowatt = 1e+12 rontowatt). See the formula, worked examples, and conversion table.
Femtowatts to Rontowatts 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.
Rontowatt is 1e-27 watt units.
Result = input x 1e-15 / 1e-27.
Power uses the watt as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Femtowatts to Rontowatts
Femtowatt and Rontowatt 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: Femtowatt is 1e-15 watt units, and rontowatt is 1e-27 watt units.
Formula
rontowatts = femtowatts × 1e+12
This factor comes from each unit's defined relationship to the category's base unit: 1 femtowatt equals 1e-15 base units, and 1 rontowatt equals 1e-27 base units, so dividing one by the other gives the direct femtowatt-to-rontowatt factor of 1e+12.
Simple example
1 fW × 1e+12 = 1e+12 rW
1 femtowatt = 1e+12 rontowatts.
Real-world example
100 fW × 1e+12 = 1e+14 rW
100 femtowatts = 1e+14 rontowatts.
Conversion table
| Femtowatt (fW) | Rontowatt (rW) |
|---|---|
| 1 fW | 1e+12 rW |
| 10 fW | 1e+13 rW |
| 100 fW | 1e+14 rW |
| 500 fW | 5e+14 rW |
| 1,000 fW | 1e+15 rW |
| 5,000 fW | 5e+15 rW |
Reverse conversion: Rontowatt to Femtowatt
1e+12 rW × 1e-12 = 1 fW
1e+12 rontowatts = 1 femtowatt.
femtowatts = rontowatts × 1e-12
For a page dedicated to this direction, see Rontowatt to Femtowatt.
Understanding the Femtowatt (fW)
Femtowatt is 1e-15 watt units.
Understanding the Rontowatt (rW)
Rontowatt is 1e-27 watt units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many rontowatts are in 1 femtowatt?
1 femtowatt equals 1e+12 rontowatts, using the exact defined conversion factor rather than an estimate.
How do I convert femtowatt to rontowatt?
Multiply the femtowatt value by 1e+12. The converter above does this instantly to whatever precision you set.
How do I convert rontowatt back to femtowatt?
Use the reverse factor: 1 rontowatt equals 1e-12 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 power.
What is a rontowatt?
Rontowatt (rW) is a unit of power.
Is the femtowatt to rontowatt conversion exact?
Yes. Both femtowatt and rontowatt are defined by fixed standards rather than physical artifacts, so the factor of 1e+12 used above is exact to as many digits as you choose to display.