Kilojoule is 1000 joule units.
Kilojoules to Foot-pounds Converter — kJ to ft-lb
Convert Kilojoule (kJ) to Foot-pound (ft-lb) using the exact conversion factor (1 kilojoule = 737.5621493 foot-pound). See the formula, worked examples, and conversion table.
Kilojoules to Foot-pounds 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.
Work from one pound-force over one foot.
Result = input x 1000 / 1.355817948.
Energy units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Kilojoules to Foot-pounds
Kilojoule and Foot-pound 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: Kilojoule is 1000 joule units, and work from one pound-force over one foot.
Formula
foot-pounds = kilojoules × 737.562149277
This factor comes from each unit's defined relationship to the category's base unit: 1 kilojoule equals 1000 base units, and 1 foot-pound equals 1.35581794833 base units, so dividing one by the other gives the direct kilojoule-to-foot-pound factor of 737.562149277.
Simple example
1 kJ × 737.5621493 = 737.5621493 ft-lb
1 kilojoule = 737.5621493 foot-pounds.
Real-world example
100 kJ × 737.5621493 = 73,756.21493 ft-lb
100 kilojoules = 73,756.21493 foot-pounds.
Conversion table
| Kilojoule (kJ) | Foot-pound (ft-lb) |
|---|---|
| 1 kJ | 737.5621493 ft-lb |
| 10 kJ | 7,375.621493 ft-lb |
| 50 kJ | 36,878.10746 ft-lb |
| 100 kJ | 73,756.21493 ft-lb |
| 500 kJ | 368,781.0746 ft-lb |
| 1,000 kJ | 737,562.1493 ft-lb |
Reverse conversion: Foot-pound to Kilojoule
737.5621493 ft-lb × 0.001355817948 = 1 kJ
737.5621493 foot-pounds = 1 kilojoules.
kilojoules = foot-pounds × 0.00135581794833
For a page dedicated to this direction, see Foot-pound to Kilojoule.
Understanding the Kilojoule (kJ)
Kilojoule is 1000 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 kilojoule?
1 kilojoule equals 737.5621493 foot-pounds, using the exact defined conversion factor rather than an estimate.
How do I convert kilojoule to foot-pound?
Multiply the kilojoule value by 737.5621493. The converter above does this instantly to whatever precision you set.
How do I convert foot-pound back to kilojoule?
Use the reverse factor: 1 foot-pound equals 0.0013558179 kilojoules. You can also use the swap control in the converter above to flip the direction instantly.
What is a kilojoule?
Kilojoule (kJ) is a unit of engineering.
What is a foot-pound?
Foot-pound (ft-lb) is a unit of engineering.
Is the kilojoule to foot-pound conversion exact?
Yes. Both kilojoule and foot-pound are defined by fixed standards rather than physical artifacts, so the factor of 737.5621493 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.