US therm used for natural gas energy.
US therms to Femtojoules Converter — therm to fJ
Convert US therm (therm) to Femtojoule (fJ) using the exact conversion factor (1 us therm = 1.054804e+23 femtojoule). See the formula, worked examples, and conversion table.
US therms to Femtojoules converter
Converter
Energy Converter
Convert joules, calories, kilowatt-hours, BTU, electronvolts, therms, and mechanical work units.
Context values
Some unit families need one extra value for a physically accurate result.
Femtojoule is 1e-15 joule units.
Result = input x 1.054804e+8 / 1e-15.
Energy uses the joule as the base unit.
Reserved above the conversion cards and below the converter.
About Converting US therms to Femtojoules
US therm and Femtojoule both measure energy, and the conversion is especially useful for comparing nutrition labels (kilocalories) against scientific energy figures (joules). Specifically: US therm used for natural gas energy, and femtojoule is 1e-15 joule units.
Formula
femtojoules = us therms × 1.054804e+23
This factor comes from each unit's defined relationship to the category's base unit: 1 us therm equals 105480400 base units, and 1 femtojoule equals 1e-15 base units, so dividing one by the other gives the direct us therm-to-femtojoule factor of 1.054804e+23.
Simple example
1 therm × 1.054804e+23 = 1.054804e+23 fJ
1 us therm = 1.054804e+23 femtojoules.
Real-world example
100 therm × 1.054804e+23 = 1.054804e+25 fJ
100 us therms = 1.054804e+25 femtojoules.
Conversion table
| US therm (therm) | Femtojoule (fJ) |
|---|---|
| 1 therm | 1.054804e+23 fJ |
| 10 therm | 1.054804e+24 fJ |
| 100 therm | 1.054804e+25 fJ |
| 500 therm | 5.27402e+25 fJ |
| 1,000 therm | 1.054804e+26 fJ |
| 2,000 therm | 2.109608e+26 fJ |
Reverse conversion: Femtojoule to US therm
1.054804e+23 fJ × 9.480434e-24 = 1 therm
1.054804e+23 femtojoules = 1 us therm.
us therms = femtojoules × 9.480434e-24
For a page dedicated to this direction, see Femtojoule to US therm.
Understanding the US therm (therm)
US therm used for natural gas energy.
Understanding the Femtojoule (fJ)
Femtojoule is 1e-15 joule units.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many femtojoules are in 1 us therm?
1 us therm equals 1.054804e+23 femtojoules, using the exact defined conversion factor rather than an estimate.
How do I convert us therm to femtojoule?
Multiply the us therm value by 1.054804e+23. The converter above does this instantly to whatever precision you set.
How do I convert femtojoule back to us therm?
Use the reverse factor: 1 femtojoule equals 9.480434e-24 us therms. You can also use the swap control in the converter above to flip the direction instantly.
What is a us therm?
US therm (therm) is a unit of energy.
What is a femtojoule?
Femtojoule (fJ) is a unit of energy.
Is the us therm to femtojoule conversion exact?
Yes. Both us therm and femtojoule are defined by fixed standards rather than physical artifacts, so the factor of 1.054804e+23 used above is exact to as many digits as you choose to display.