Foot-Pound/Second to Joule/Second Converter

Power Converter

22 units available

Decimals:

From

To

1.355818

1 ft·lbf/s = 1.355818 J/s

Formula:

J/s = ft·lbf/s × 1.3558179483

With your value: 1 ft·lbf/s = 1.35581795 J/s

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 Joule/Second conversions

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

Foot-Pound/Second to Joule/Second Conversion Table

Foot-Pound/Second (ft·lbf/s)	Joule/Second (J/s)
0.5	0.677909
1	1.355818
2	2.711636
5	6.77909
10	13.558179
15	20.337269
20	27.116359
25	33.895449
50	67.790897
100	135.581795
250	338.954487
500	677.908974
1000	1,355.817948

Joule/Second to Foot-Pound/Second Conversion Table

Joule/Second (J/s)	Foot-Pound/Second (ft·lbf/s)
0.5	0.368781
1	0.737562
2	1.475124
5	3.687811
10	7.375621
15	11.063432
20	14.751243
25	18.439054
50	36.878107
100	73.756215
250	184.390537
500	368.781075
1000	737.562149

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

Joule/Second (J/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

How to Convert Foot-Pound/Second to Joule/Second

To convert from Foot-Pound/Second (ft·lbf/s) to Joule/Second (J/s), multiply the value by 1.3558179483.

Formula: J/s = ft·lbf/s × 1.3558179483

Reverse: ft·lbf/s = J/s × 0.7375621493

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 1.3558179483
The result is: 6.77909 J/s

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 Joule/Second

The joule/second (J/s) is a unit of power. One joule/second equals 1 watt. 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 Joule/Second are in 1 Foot-Pound/Second?

There are exactly 1.3558179483 Joule/Second in 1 Foot-Pound/Second. This means the conversion factor from Foot-Pound/Second to Joule/Second is 1.3558179483.

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

The formula to convert Foot-Pound/Second to Joule/Second is: J/s = ft·lbf/s × 1.3558179483. For example, to convert 10 Foot-Pound/Second to Joule/Second, you would multiply 10 by 1.3558179483.

What is a Foot-Pound/Second?