Horsepower (Mech) to Joule/Second Converter

Power Converter

22 units available

Decimals:

From

To

745.699872

1 hp = 745.699872 J/s

Formula:

J/s = hp × 745.6998715823

With your value: 1 hp = 745.69987158 J/s

How big is that?

Everyday references on a logarithmic scale, all expressed in horsepower (mech) so you can sanity-check the result.

LED bulb (1/83 your value)0.0121 hp

Laptop (1/11 your value)0.0872 hp

Your value1.00 hp

Microwave oven (1.3× your value)1.34 hp

Electric kettle (4.0× your value)4.02 hp

Family car engine (1.2e+2× your value)121 hp

Other Horsepower (Mech) to Joule/Second conversions

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

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

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

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.

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

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 Horsepower (Mech) to Joule/Second

To convert from Horsepower (Mech) (hp) to Joule/Second (J/s), multiply the value by 745.6998715823.

Formula: J/s = hp × 745.6998715823

Reverse: hp = J/s × 0.0013410221

Step-by-Step Example

Start with your value in Horsepower (Mech). For example: 5 hp
Multiply by the conversion factor: 5 x 745.6998715823
The result is: 3,728.499358 J/s

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.

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 Horsepower (Mech)?

There are exactly 745.6998715823 Joule/Second in 1 Horsepower (Mech). This means the conversion factor from Horsepower (Mech) to Joule/Second is 745.6998715823.

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

The formula to convert Horsepower (Mech) to Joule/Second is: J/s = hp × 745.6998715823. For example, to convert 10 Horsepower (Mech) to Joule/Second, you would multiply 10 by 745.6998715823.

What is a Horsepower (Mech)?