Kilojoules to Foot Pounds
Convert kilojoules to foot pounds instantly — one kilojoule is 737.562 foot pounds.
| Kilojoules | Foot Pounds |
|---|---|
| 1 kJ | 737.562149 ft·lb |
| 2 kJ | 1475.124299 ft·lb |
| 3 kJ | 2212.686448 ft·lb |
| 5 kJ | 3687.810746 ft·lb |
| 10 kJ | 7375.621493 ft·lb |
| 25 kJ | 18439.053732 ft·lb |
| 50 kJ | 36878.107464 ft·lb |
| 100 kJ | 73756.214928 ft·lb |
How to use
- Enter a value in the Kilojoules field.
- The Foot Pounds figure appears immediately — no button to press.
- Typing in the Foot Pounds field converts back to Kilojoules the same way.
- Use the reference table for the values that come up most often.
Kilojoules to Foot Pounds formula
Converting kilojoules to foot pounds is a single multiplication by 737.562149.
ft·lb = kJ × 737.562149
Why this factor: the kilojoule and the foot-pound are both defined against the joule, so dividing one definition by the other gives 737.562149 directly. Both definitions are set out in full below.
To go the other way, divide by 737.562149 — or use the Foot Pounds to Kilojoules converter, which is the same calculation reversed.
Worked example
Given 2000 kJ, multiplying by 737.562149 yields 1475124.298555 ft·lb.
2000 kJ × 737.562149 = 1475124.298555 ft·lb
The converter above does this for any value you type, in either direction.
What is a kilojoule?
A kilojoule is 1,000 joules, the metric unit of food energy.
Definition: Exactly 1,000 joules.
Where it is used: Nutrition labels in Europe and Australia, and heating and cooling loads.
What is a foot-pound?
A foot-pound is the work done by one pound-force acting through one foot.
Definition: About 1.3558179 joules.
Where it is used: US mechanical work and torque figures, fastener specifications, and firearm muzzle energy.
Worth knowing: As a torque unit it is properly 'pound-foot' (lbf·ft); as an energy unit it is 'foot-pound'. The numbers coincide but the quantities differ.
Kilojoules vs Foot Pounds
The kilojoule is a metric unit while the foot-pound is a US customary unit. That is why the factor between them is not a round number: the two systems were defined independently and only later tied together by exact agreement.
Frequently asked questions
How many foot pounds are in a kilojoule?
One kilojoule equals 737.562149 foot pounds.
What is the formula to convert kilojoules to foot pounds?
Multiply the number of kilojoules by 737.562149. To reverse it, divide by 737.562149 instead.
How do I convert foot pounds back to kilojoules?
Divide by 737.562149, which is the same as multiplying by 0.00135581795.
How many foot pounds are in 10 kilojoules?
10 kJ works out to 7375.621493 ft·lb.
Is there anything to watch out for with foot pounds?
As a torque unit it is properly 'pound-foot' (lbf·ft); as an energy unit it is 'foot-pound'. The numbers coincide but the quantities differ.
How is the kilojoule defined?
Exactly 1,000 joules.