Joule/Second to Horsepower (Mech) Converter

Power Converter

22 units available

Decimals:

From

To

0.001341

1 J/s = 0.001341 hp

Formula:

hp = J/s × 0.0013410221

With your value: 1 J/s = 0.00134102 hp

How big is that?

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

Your value1.00 J/s

LED bulb (9.0× your value)9.00 J/s

Laptop (65× your value)65.0 J/s

Microwave oven (1.0e+3× your value)1.00e+3 J/s

Electric kettle (3.0e+3× your value)3.00e+3 J/s

Family car engine (9.0e+4× your value)9.00e+4 J/s

Other Joule/Second to Horsepower (Mech) conversions

2 J/s to hp 3 J/s to hp 4 J/s to hp 5 J/s to hp 6 J/s to hp 7 J/s to hp 8 J/s to hp

Joule/Second to Horsepower (Mech) Conversion Table

Joule/Second (J/s)	Horsepower (Mech) (hp)
0.5	0.000671
1	0.001341
2	0.002682
5	0.006705
10	0.01341
15	0.020115
20	0.02682
25	0.033526
50	0.067051
100	0.134102
250	0.335256
500	0.670511
1000	1.341022

Horsepower (Mech) to Joule/Second Conversion Table

Horsepower (Mech) (hp)	Joule/Second (J/s)
0.5	372.849936
1	745.699872
2	1,491.399743
5	3,728.499358
10	7,456.998716
15	11,185.498074
20	14,913.997432
25	18,642.49679
50	37,284.993579
100	74,569.987158
250	186,424.967896
500	372,849.935791
1000	745,699.871582

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.

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

Horsepower (Mech) (hp)

Power

Exact conversion

Mechanical horsepower is exactly 550 ft·lbf/s = 745.699 871 582 270 22 W.

Metric horsepower (PS) is 735.498 75 W — about 1.4 % lower.

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 Joule/Second to Horsepower (Mech)

To convert from Joule/Second (J/s) to Horsepower (Mech) (hp), multiply the value by 0.0013410221.

Formula: hp = J/s × 0.0013410221

Reverse: J/s = hp × 745.6998715823

Step-by-Step Example

Start with your value in Joule/Second. For example: 5 J/s
Multiply by the conversion factor: 5 x 0.0013410221
The result is: 0.006705 hp

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.

About Horsepower (Mech)

The horsepower (mech) (hp) is a unit of power. One horsepower (mech) equals 745.6998716 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 Horsepower (Mech) are in 1 Joule/Second?

There are exactly 0.0013410221 Horsepower (Mech) in 1 Joule/Second. This means the conversion factor from Joule/Second to Horsepower (Mech) is 0.0013410221.

What is the formula to convert Joule/Second to Horsepower (Mech)?

The formula to convert Joule/Second to Horsepower (Mech) is: hp = J/s × 0.0013410221. For example, to convert 10 Joule/Second to Horsepower (Mech), you would multiply 10 by 0.0013410221.

What is a Joule/Second?