Foot-Pound to Kilojoule Converter

Energy Converter

27 units available

Decimals:

From

To

0.001356

1 ft·lbf = 0.001356 kJ

Formula:

kJ = ft·lbf × 0.0013558179

With your value: 1 ft·lbf = 0.00135582 kJ

How big is that?

Everyday references on a logarithmic scale, all expressed in foot-pound so you can sanity-check the result.

Heartbeat (1/1.4 your value)0.738 ft·lbf

Your value1.00 ft·lbf

AA battery charge (7.4e+3× your value)7.38e+3 ft·lbf

Slice of bread (2.1e+5× your value)2.07e+5 ft·lbf

Daily food intake (6.2e+6× your value)6.20e+6 ft·lbf

Litre of petrol (2.5e+7× your value)2.52e+7 ft·lbf

Other Foot-Pound to Kilojoule conversions

2 ft·lbf to kJ 3 ft·lbf to kJ 4 ft·lbf to kJ 5 ft·lbf to kJ 6 ft·lbf to kJ 7 ft·lbf to kJ 8 ft·lbf to kJ

Foot-Pound to Kilojoule Conversion Table

Foot-Pound (ft·lbf)	Kilojoule (kJ)
0.5	0.000678
1	0.001356
2	0.002712
5	0.006779
10	0.013558
15	0.020337
20	0.027116
25	0.033895
50	0.067791
100	0.135582
250	0.338954
500	0.677909
1000	1.355818

Kilojoule to Foot-Pound Conversion Table

Kilojoule (kJ)	Foot-Pound (ft·lbf)
0.5	368.781075
1	737.562149
2	1,475.124299
5	3,687.810746
10	7,375.621493
15	11,063.432239
20	14,751.242986
25	18,439.053732
50	36,878.107465
100	73,756.214929
250	184,390.537324
500	368,781.074647
1000	737,562.149294

Where these values come from

Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.

Foot-Pound (ft·lbf)

Energy

Exact conversion

Derived from the joule (1 J = 1 kg·m²/s²). Thermochemical and IT calories, BTU and kWh are exact defined multiples.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

Kilojoule (kJ)

Energy

Exact conversion

Derived from the joule (1 J = 1 kg·m²/s²). Thermochemical and IT calories, BTU and kWh are exact defined multiples.

Source: NIST Special Publication 811, Guide for the Use of the International System of Units

National Institute of Standards and Technology (US) · Reviewed 2026-07-01

How to Convert Foot-Pound to Kilojoule

To convert from Foot-Pound (ft·lbf) to Kilojoule (kJ), multiply the value by 0.0013558179.

Formula: kJ = ft·lbf × 0.0013558179

Reverse: ft·lbf = kJ × 737.5621492943

Step-by-Step Example

Start with your value in Foot-Pound. For example: 5 ft·lbf
Multiply by the conversion factor: 5 x 0.0013558179
The result is: 0.006779 kJ

About Foot-Pound

The foot-pound (ft·lbf) is a unit of energy and work. One foot-pound equals 1.355817948 joules. UnitConvertLab converts it against every other energy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: energy calculations, engineering and science, education.

About Kilojoule

The kilojoule (kJ) is a unit of energy and work. One kilojoule equals 1000 joules. UnitConvertLab converts it against every other energy unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

Common uses: energy calculations, engineering and science, education.

Frequently Asked Questions

How many Kilojoule are in 1 Foot-Pound?

There are exactly 0.0013558179 Kilojoule in 1 Foot-Pound. This means the conversion factor from Foot-Pound to Kilojoule is 0.0013558179.

What is the formula to convert Foot-Pound to Kilojoule?

The formula to convert Foot-Pound to Kilojoule is: kJ = ft·lbf × 0.0013558179. For example, to convert 10 Foot-Pound to Kilojoule, you would multiply 10 by 0.0013558179.

What is a Foot-Pound?