Power rate using BTU per hour.
BTU per hour to Femtowatts Converter — BTU/h to fW
Convert BTU per hour (BTU/h) to Femtowatt (fW) using the exact conversion factor (1 btu per hour = 2.930711e+14 femtowatt). See the formula, worked examples, and conversion table.
BTU per hour to Femtowatts converter
Converter
Engineering Converter
Convert common stress, force, torque, power, and energy units used in engineering.
Context values
Some unit families need one extra value for a physically accurate result.
Femtowatt is 1e-15 watt units.
Result = input x 0.2930710702 / 1e-15.
Power units are compatible.
Reserved above the conversion cards and below the converter.
About Converting BTU per hour to Femtowatts
BTU per hour and Femtowatt both measure a quantity used in structural or mechanical engineering — commonly stress, pressure, force, torque, power, or energy — where converting between the unit conventions used in different regions, industries, or equipment specifications is a routine part of design work. Specifically: Power rate using BTU per hour, and femtowatt is 1e-15 watt units.
Formula
femtowatts = btu per hour × 2.930711e+14
This factor comes from each unit's defined relationship to the category's base unit: 1 btu per hour equals 0.293071070172 base units, and 1 femtowatt equals 1e-15 base units, so dividing one by the other gives the direct btu per hour-to-femtowatt factor of 2.930711e+14.
Simple example
1 BTU/h × 2.930711e+14 = 2.930711e+14 fW
1 btu per hour = 2.930711e+14 femtowatts.
Real-world example
100 BTU/h × 2.930711e+14 = 2.930711e+16 fW
100 btu per hour = 2.930711e+16 femtowatts.
Conversion table
| BTU per hour (BTU/h) | Femtowatt (fW) |
|---|---|
| 1 BTU/h | 2.930711e+14 fW |
| 10 BTU/h | 2.930711e+15 fW |
| 50 BTU/h | 1.465355e+16 fW |
| 100 BTU/h | 2.930711e+16 fW |
| 500 BTU/h | 1.465355e+17 fW |
| 1,000 BTU/h | 2.930711e+17 fW |
Reverse conversion: Femtowatt to BTU per hour
2.930711e+14 fW × 3.412142e-15 = 1.000000102 BTU/h
2.930711e+14 femtowatts = 1.000000102 btu per hour.
btu per hour = femtowatts × 3.412142e-15
For a page dedicated to this direction, see Femtowatt to BTU per hour.
Understanding the BTU per hour (BTU/h)
Power rate using BTU per hour.
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 btu per hour?
1 btu per hour equals 2.930711e+14 femtowatts, using the exact defined conversion factor rather than an estimate.
How do I convert btu per hour to femtowatt?
Multiply the btu per hour value by 2.930711e+14. The converter above does this instantly to whatever precision you set.
How do I convert femtowatt back to btu per hour?
Use the reverse factor: 1 femtowatt equals 3.412142e-15 btu per hour. You can also use the swap control in the converter above to flip the direction instantly.
What is a btu per hour?
BTU per hour (BTU/h) is a unit of engineering.
What is a femtowatt?
Femtowatt (fW) is a unit of engineering.
Is the btu per hour to femtowatt conversion exact?
Yes. Both btu per hour and femtowatt are defined by fixed standards rather than physical artifacts, so the factor of 2.930711e+14 used above is exact to as many digits as you choose to display.
Why do engineering unit conventions vary so much by region and industry?
Pressure, force, and stress can be expressed in metric (pascal, newton), US customary (psi, pound-force), or older and industry-specific units (atmosphere, torr, kip) depending on the country, industry, and even the equipment manufacturer, which is why engineers routinely need to convert between them when working across specs from different sources.