Foot-pounds to Kilojoules
Convert foot-pounds to kilojoules instantly. 1 ft·lb = 0.0013558179 kJ. Includes the exact factor, a conversion table of common values and the definition of both units.
How to convert foot-pounds to kilojoules
To convert foot-pounds to kilojoules, divide by 737.5621492773 (multiply by 0.0013558179). The relationship is fixed, so the same factor works for any quantity — there is nothing to look up and nothing that changes with temperature, location or context.
kJ = ft·lb × 0.0013558179
Foot-pounds to Kilojoules conversion table
The values people look up most often, rounded for reading. Use the calculator above for anything in between.
| Foot-pounds | Kilojoules |
|---|---|
| 1 ft·lb | 0.001356 kJ |
| 2 ft·lb | 0.002712 kJ |
| 3 ft·lb | 0.004067 kJ |
| 5 ft·lb | 0.006779 kJ |
| 10 ft·lb | 0.013558 kJ |
| 20 ft·lb | 0.027116 kJ |
| 25 ft·lb | 0.033895 kJ |
| 50 ft·lb | 0.067791 kJ |
| 100 ft·lb | 0.135582 kJ |
| 500 ft·lb | 0.677909 kJ |
| 1,000 ft·lb | 1.355818 kJ |
What is a foot-pound?
The energy of one pound-force acting through one foot.
What is a kilojoule?
A thousand joules. Food energy is labelled in kilojoules outside the US.
The formula
kJ = ft·lb × 0.0013558179
Every result on this page comes from this formula. Nothing is rounded until the final display, so figures match a spreadsheet to the cent.
How to use the Foot-pounds to Kilojoules
- Type the number of foot-pounds you want to convert.
- Read the result in kilojoules straight away — there is no button to press.
- Check the table below for the values that come up most often, or reverse the conversion with the linked kilojoules to foot-pounds page.
Foot-pounds to Kilojoules — frequently asked questions
How many kilojoules are in a foot-pound?
One foot-pound equals 0.0013558179 kJ. kJ = ft·lb × 0.0013558179
What is the formula to convert foot-pounds to kilojoules?
The formula is kJ = ft·lb × 0.0013558179. It is an exact definition rather than an approximation, so the conversion never drifts no matter how large the number.
How do I convert kilojoules back to foot-pounds?
Divide instead of multiplying: one kilojoule is 737.5621492773 ft·lb. The reverse converter is linked in the related tools list.
Is this conversion exact?
Yes. Both units are defined against the same base unit by international agreement, so the factor is exact — any rounding you see is only in the display, which you can widen by entering more decimal places.
Is this foot-pounds to kilojoules free to use?
Yes. Every calculator on the site is free, needs no sign-up, and runs entirely in your browser, so your figures never leave your device.
What people search for
This page answers each of these searches. They are the exact phrases visitors use to find the foot-pounds to kilojoules.
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About this calculator
Written and reviewed by The Samsung Calculator editorial team. Every calculator is written against a published formula, reviewed against at least one independent reference implementation, and dated when it changes.
Last reviewed August 19, 2026 · Calculation runs client-side · No data collected · Report an error