Foot-pounds to Kilojoules Converter
One Foot-pound equals 0.001355817948 Kilojoules (1 ft-lb = 0.001355817948 kJ). Multiply a Foot-pound value by 0.001355817948 to get the equivalent in Kilojoules. Enter a value above to calculate the result. You can also use the formula and reference table below.
Formula
kJ = ft-lb × 0.001355817948
Multiply the Foot-pound value by 0.001355817948 to get the equivalent value in Kilojoules.
Example Conversions
1 Foot-pound (ft-lb)
0.001355817948 Kilojoule (kJ)
5 Foot-pound (ft-lb)
0.006779089741 Kilojoule (kJ)
10 Foot-pound (ft-lb)
0.01355817948 Kilojoule (kJ)
25 Foot-pound (ft-lb)
0.03389544871 Kilojoule (kJ)
100 Foot-pound (ft-lb)
0.1355817948 Kilojoule (kJ)
Conversion Table
| Foot-pound (ft-lb) | Kilojoule (kJ) |
|---|---|
| 0.1 | 0.0001355817948 |
| 0.5 | 0.0006779089741 |
| 1 | 0.001355817948 |
| 2 | 0.002711635897 |
| 5 | 0.006779089741 |
| 10 | 0.01355817948 |
| 25 | 0.03389544871 |
| 50 | 0.06779089741 |
| 100 | 0.1355817948 |
| 250 | 0.3389544871 |
| 500 | 0.6779089741 |
| 1000 | 1.355817948 |
How to Convert Manually
Use these steps to convert Foot-pound values to Kilojoule without the calculator.
- Write down the value in Foot-pound (ft-lb) that you want to convert.
- Multiply that value by 0.001355817948.
- For example, 10 Foot-pounds × 0.001355817948 = 0.01355817948 Kilojoules.
- Label the result as Kilojoule (kJ).
Relative Size Comparison
This chart shows the visual difference in size between exactly one Foot-pound and one Kilojoule.
About Foot-pound and Kilojoule
The foot-pound is about 1.3558 joules, the work of one pound-force through one foot. US mechanical engineering and firearm muzzle energy use foot-pounds. The kilojoule is 1,000 joules. Food energy in Australia, Europe, and most metric countries is labeled in kilojoules alongside or instead of calories. One Foot-pound equals 0.001355817948 Kilojoules (1 ft-lb = 0.001355817948 kJ). Foot-pound is used in US mechanical engineering and in firearm muzzle energy. Kilojoule is used in food labels outside the US.
Precision and Rounding:Energy factors mix exact definitions (1 kWh = 3,600,000 J; 1 cal = 4.184 J thermochemical) with measured conventions (1 BTU ≈ 1,055.056 J). Nutrition and utility bills round to whole units; engineering heat calculations should keep the full factor until the final step.
Conversion factors per NIST Special Publication 811 and the BIPM SI Brochure (9th edition) (reference).
Worked Example
15Foot-pounds equals0.02033726922Kilojoules.
15 ft-lb × 0.001355817948 = 0.02033726922 kJ
FAQ
How do I convert Foot-pound to Kilojoule?
Multiply the Foot-pound value by 0.001355817948 to get the equivalent value in Kilojoules.
What is the formula for Foot-pound to Kilojoule?
The formula is kJ = ft-lb × 0.001355817948.
How many Kilojoules are in 1 Foot-pound?
1 Foot-pound equals 0.001355817948 Kilojoules.
Can I convert Kilojoule back to Foot-pound?
Yes. 1 Kilojoule equals 737.5621493 Foot-pounds, and the related converter can reverse the calculation.
What are common names for Foot-pound and Kilojoule?
Foot-pound is shown as ft-lb and may also be searched as foot-pound, foot pound, ft·lb. Kilojoule is shown as kJ and may also be searched as kilojoule, kilojoules.
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