Zeptojoule is 1e-21 joule units.
Zeptojoules to Foot-pounds Converter — zJ to ft-lb
Convert Zeptojoule (zJ) to Foot-pound (ft-lb) using the exact conversion factor (1 zeptojoule = 7.375621e-22 foot-pound). See the formula, worked examples, and conversion table.
Zeptojoules 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-21 / 1.355817948.
Energy uses the joule as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Zeptojoules to Foot-pounds
Zeptojoule and Foot-pound both measure energy, and the conversion is especially useful for comparing nutrition labels (kilocalories) against scientific energy figures (joules). Specifically: Zeptojoule is 1e-21 joule units, and work from one pound-force over one foot.
Formula
foot-pounds = zeptojoules × 7.375621e-22
This factor comes from each unit's defined relationship to the category's base unit: 1 zeptojoule equals 1e-21 base units, and 1 foot-pound equals 1.35581794833 base units, so dividing one by the other gives the direct zeptojoule-to-foot-pound factor of 7.375621e-22.
Simple example
1 zJ × 7.375621e-22 = 7.375621e-22 ft-lb
1 zeptojoule = 7.375621e-22 foot-pounds.
Real-world example
100 zJ × 7.375621e-22 = 7.375621e-20 ft-lb
100 zeptojoules = 7.375621e-20 foot-pounds.
Conversion table
| Zeptojoule (zJ) | Foot-pound (ft-lb) |
|---|---|
| 1 zJ | 7.375621e-22 ft-lb |
| 10 zJ | 7.375621e-21 ft-lb |
| 100 zJ | 7.375621e-20 ft-lb |
| 500 zJ | 3.687811e-19 ft-lb |
| 1,000 zJ | 7.375621e-19 ft-lb |
| 2,000 zJ | 1.475124e-18 ft-lb |
Reverse conversion: Foot-pound to Zeptojoule
7.375621e-22 ft-lb × 1.355818e+21 = 0.9999999332 zJ
7.375621e-22 foot-pounds = 0.9999999332 zeptojoules.
zeptojoules = foot-pounds × 1.355818e+21
For a page dedicated to this direction, see Foot-pound to Zeptojoule.
Understanding the Zeptojoule (zJ)
Zeptojoule is 1e-21 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 zeptojoule?
1 zeptojoule equals 7.375621e-22 foot-pounds, using the exact defined conversion factor rather than an estimate.
How do I convert zeptojoule to foot-pound?
Multiply the zeptojoule value by 7.375621e-22. The converter above does this instantly to whatever precision you set.
How do I convert foot-pound back to zeptojoule?
Use the reverse factor: 1 foot-pound equals 1.355818e+21 zeptojoules. You can also use the swap control in the converter above to flip the direction instantly.
What is a zeptojoule?
Zeptojoule (zJ) is a unit of energy.
What is a foot-pound?
Foot-pound (ft-lb) is a unit of energy.
Is the zeptojoule to foot-pound conversion exact?
Yes. Both zeptojoule and foot-pound are defined by fixed standards rather than physical artifacts, so the factor of 7.375621e-22 used above is exact to as many digits as you choose to display.