Femtojoule is 1e-15 joule units.
Femtojoules to Foot-pounds Converter — fJ to ft-lb
Convert Femtojoule (fJ) to Foot-pound (ft-lb) using the exact conversion factor (1 femtojoule = 7.375621e-16 foot-pound). See the formula, worked examples, and conversion table.
Femtojoules to Foot-pounds 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.
Work from one pound-force over one foot.
Result = input x 1e-15 / 1.355817948.
Energy uses the joule as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Femtojoules to Foot-pounds
Femtojoule and Foot-pound 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 work from one pound-force over one foot.
Formula
foot-pounds = femtojoules × 7.375621e-16
This factor comes from each unit's defined relationship to the category's base unit: 1 femtojoule equals 1e-15 base units, and 1 foot-pound equals 1.35581794833 base units, so dividing one by the other gives the direct femtojoule-to-foot-pound factor of 7.375621e-16.
Simple example
1 fJ × 7.375621e-16 = 7.375621e-16 ft-lb
1 femtojoule = 7.375621e-16 foot-pounds.
Real-world example
100 fJ × 7.375621e-16 = 7.375621e-14 ft-lb
100 femtojoules = 7.375621e-14 foot-pounds.
Conversion table
| Femtojoule (fJ) | Foot-pound (ft-lb) |
|---|---|
| 1 fJ | 7.375621e-16 ft-lb |
| 10 fJ | 7.375621e-15 ft-lb |
| 100 fJ | 7.375621e-14 ft-lb |
| 500 fJ | 3.687811e-13 ft-lb |
| 1,000 fJ | 7.375621e-13 ft-lb |
| 2,000 fJ | 1.475124e-12 ft-lb |
Reverse conversion: Foot-pound to Femtojoule
7.375621e-16 ft-lb × 1.355818e+15 = 0.9999999332 fJ
7.375621e-16 foot-pounds = 0.9999999332 femtojoules.
femtojoules = foot-pounds × 1.355818e+15
For a page dedicated to this direction, see Foot-pound to Femtojoule.
Understanding the Femtojoule (fJ)
Femtojoule is 1e-15 joule units.
Understanding the Foot-pound (ft-lb)
Work from one pound-force over one foot.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many foot-pounds are in 1 femtojoule?
1 femtojoule equals 7.375621e-16 foot-pounds, using the exact defined conversion factor rather than an estimate.
How do I convert femtojoule to foot-pound?
Multiply the femtojoule value by 7.375621e-16. The converter above does this instantly to whatever precision you set.
How do I convert foot-pound back to femtojoule?
Use the reverse factor: 1 foot-pound equals 1.355818e+15 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 foot-pound?
Foot-pound (ft-lb) is a unit of energy.
Is the femtojoule to foot-pound conversion exact?
Yes. Both femtojoule and foot-pound are defined by fixed standards rather than physical artifacts, so the factor of 7.375621e-16 used above is exact to as many digits as you choose to display.