Foot-Pound/Second to Kilojoule/Hour Converter

Power Converter

22 units available

Decimals:

From

To

4.880945

1 ft·lbf/s = 4.880945 kJ/h

Formula:

kJ/h = ft·lbf/s × 4.8809446139

With your value: 1 ft·lbf/s = 4.88094461 kJ/h

How big is that?

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

Your value1.00 ft·lbf/s

LED bulb (6.6× your value)6.64 ft·lbf/s

Laptop (48× your value)47.9 ft·lbf/s

Microwave oven (7.4e+2× your value)738 ft·lbf/s

Electric kettle (2.2e+3× your value)2.21e+3 ft·lbf/s

Family car engine (6.6e+4× your value)6.64e+4 ft·lbf/s

Other Foot-Pound/Second to Kilojoule/Hour conversions

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

Foot-Pound/Second to Kilojoule/Hour Conversion Table

Foot-Pound/Second (ft·lbf/s)	Kilojoule/Hour (kJ/h)
0.5	2.440472
1	4.880945
2	9.761889
5	24.404723
10	48.809446
15	73.214169
20	97.618892
25	122.023615
50	244.047231
100	488.094461
250	1,220.236153
500	2,440.472307
1000	4,880.944614

Kilojoule/Hour to Foot-Pound/Second Conversion Table

Kilojoule/Hour (kJ/h)	Foot-Pound/Second (ft·lbf/s)
0.5	0.102439
1	0.204878
2	0.409757
5	1.024392
10	2.048784
15	3.073176
20	4.097567
25	5.121959
50	10.243919
100	20.487837
250	51.219594
500	102.439187
1000	204.878375

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/Second (ft·lbf/s)

Power

Exact conversion

Derived from the watt (1 W = 1 J/s).

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/Hour (kJ/h)

Power

Exact conversion

Derived from the watt (1 W = 1 J/s).

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/Second to Kilojoule/Hour

To convert from Foot-Pound/Second (ft·lbf/s) to Kilojoule/Hour (kJ/h), multiply the value by 4.8809446139.

Formula: kJ/h = ft·lbf/s × 4.8809446139

Reverse: ft·lbf/s = kJ/h × 0.2048783748

Step-by-Step Example

Start with your value in Foot-Pound/Second. For example: 5 ft·lbf/s
Multiply by the conversion factor: 5 x 4.8809446139
The result is: 24.404723 kJ/h

About Foot-Pound/Second

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

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

About Kilojoule/Hour

The kilojoule/hour (kJ/h) is a unit of power. One kilojoule/hour equals 0.2777777778 watts. UnitConvertLab converts it against every other power unit using this exact definition, so results are reproducible to full double precision rather than rounded lookup tables.

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

Frequently Asked Questions

How many Kilojoule/Hour are in 1 Foot-Pound/Second?

There are exactly 4.8809446139 Kilojoule/Hour in 1 Foot-Pound/Second. This means the conversion factor from Foot-Pound/Second to Kilojoule/Hour is 4.8809446139.

What is the formula to convert Foot-Pound/Second to Kilojoule/Hour?

The formula to convert Foot-Pound/Second to Kilojoule/Hour is: kJ/h = ft·lbf/s × 4.8809446139. For example, to convert 10 Foot-Pound/Second to Kilojoule/Hour, you would multiply 10 by 4.8809446139.

What is a Foot-Pound/Second?