Femtojoule is 1e-15 joule units.
Femtojoules to US therms Converter — fJ to therm
Convert Femtojoule (fJ) to US therm (therm) using the exact conversion factor (1 femtojoule = 9.480434e-24 us therm). See the formula, worked examples, and conversion table.
Femtojoules to US therms 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.
US therm used for natural gas energy.
Result = input x 1e-15 / 1.054804e+8.
Energy uses the joule as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Femtojoules to US therms
Femtojoule and US therm both measure energy, and the conversion is especially useful for comparing nutrition labels (kilocalories) against scientific energy figures (joules). Specifically: Femtojoule is 1e-15 joule units, and uS therm used for natural gas energy.
Formula
us therms = femtojoules × 9.480434e-24
This factor comes from each unit's defined relationship to the category's base unit: 1 femtojoule equals 1e-15 base units, and 1 us therm equals 105480400 base units, so dividing one by the other gives the direct femtojoule-to-us therm factor of 9.480434e-24.
Simple example
1 fJ × 9.480434e-24 = 9.480434e-24 therm
1 femtojoule = 9.480434e-24 us therms.
Real-world example
100 fJ × 9.480434e-24 = 9.480434e-22 therm
100 femtojoules = 9.480434e-22 us therms.
Conversion table
| Femtojoule (fJ) | US therm (therm) |
|---|---|
| 1 fJ | 9.480434e-24 therm |
| 10 fJ | 9.480434e-23 therm |
| 100 fJ | 9.480434e-22 therm |
| 500 fJ | 4.740217e-21 therm |
| 1,000 fJ | 9.480434e-21 therm |
| 2,000 fJ | 1.896087e-20 therm |
Reverse conversion: US therm to Femtojoule
9.480434e-24 therm × 1.054804e+23 = 0.9999999705 fJ
9.480434e-24 us therms = 0.9999999705 femtojoules.
femtojoules = us therms × 1.054804e+23
For a page dedicated to this direction, see US therm to Femtojoule.
Understanding the Femtojoule (fJ)
Femtojoule is 1e-15 joule units.
Understanding the US therm (therm)
US therm used for natural gas energy.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many us therms are in 1 femtojoule?
1 femtojoule equals 9.480434e-24 us therms, using the exact defined conversion factor rather than an estimate.
How do I convert femtojoule to us therm?
Multiply the femtojoule value by 9.480434e-24. The converter above does this instantly to whatever precision you set.
How do I convert us therm back to femtojoule?
Use the reverse factor: 1 us therm equals 1.054804e+23 femtojoules. You can also use the swap control in the converter above to flip the direction instantly.
What is a femtojoule?
Femtojoule (fJ) is a unit of energy.
What is a us therm?
US therm (therm) is a unit of energy.
Is the femtojoule to us therm conversion exact?
Yes. Both femtojoule and us therm are defined by fixed standards rather than physical artifacts, so the factor of 9.480434e-24 used above is exact to as many digits as you choose to display.