Foot-pound to Kilojoule Converter

One Foot-pound equals 0.001355817948 Kilojoule (1 ft-lb = 0.001355817948 kJ). Multiply a Foot-pound value by 0.001355817948 to get the equivalent in Kilojoule. Use the calculator above for instant results, or follow the formula, worked examples, and reference table below.

Formula

kJ = ft-lb × 0.001355817948

Multiply the Foot-pound value by 0.001355817948 to get the equivalent value in Kilojoule.

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

Common conversion values from Foot-pound to Kilojoule
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.

  1. Write down the value in Foot-pound (ft-lb) that you want to convert.
  2. Multiply that value by 0.001355817948.
  3. For example, 10 Foot-pound × 0.001355817948 = 0.01355817948 Kilojoule.
  4. Label the result as Kilojoule (kJ).

Relative Size Comparison

1 Foot-pound
1 Kilojoule737.5621493Foot-pounds
1kJ

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 Kilojoule (1 ft-lb = 0.001355817948 kJ). Foot-pound to Kilojoule conversion comes up most often in US mechanical engineering and in firearm muzzle energy, typically when figures need restating for 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

15 Foot-pound equals 0.02033726922 Kilojoule.

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 Kilojoule.

What is the formula for Foot-pound to Kilojoule?

The formula is kJ = ft-lb × 0.001355817948.

How many Kilojoule are in 1 Foot-pound?

1 Foot-pound equals 0.001355817948 Kilojoule.

Can I convert Kilojoule back to Foot-pound?

Yes. 1 Kilojoule equals 737.5621493 Foot-pound, 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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