Joule to Horsepower-Hour Converter

Energy Converter

27 units available

Decimals:

From

To

3.725061e-7

1 J = 3.725061e-7 hp·h

Formula:

hp·h = J × 3.725061e-7

With your value: 1 J = 3.725061e-7 hp·h

How big is that?

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

Heartbeat (1.0× your value)1.00 J

Your value1.00 J

AA battery charge (1.0e+4× your value)1.00e+4 J

Slice of bread (2.8e+5× your value)2.80e+5 J

Daily food intake (8.4e+6× your value)8.40e+6 J

Litre of petrol (3.4e+7× your value)3.42e+7 J

Other Joule to Horsepower-Hour conversions

2 J to hp·h 3 J to hp·h 4 J to hp·h 5 J to hp·h 6 J to hp·h 7 J to hp·h 8 J to hp·h

Joule to Horsepower-Hour Conversion Table

Joule (J)	Horsepower-Hour (hp·h)
0.5	1.862531e-7
1	3.725061e-7
2	7.450123e-7
5	1.862531e-6
10	3.725061e-6
15	5.587592e-6
20	7.450123e-6
25	9.312653e-6
50	1.862531e-5
100	3.725061e-5
250	9.312653e-5
500	0.000186
1000	0.000373

Horsepower-Hour to Joule Conversion Table

Horsepower-Hour (hp·h)	Joule (J)
0.5	1,342,259.76885
1	2,684,519.5377
2	5,369,039.0754
5	13,422,597.6885
10	26,845,195.377
15	40,267,793.0655
20	53,690,390.754
25	67,112,988.4425
50	134,225,976.885
100	268,451,953.77
250	671,129,884.425
500	1,342,259,768.85
1000	2,684,519,537.700001

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 (J)

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

Horsepower-Hour (hp·h)

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 Joule to Horsepower-Hour

To convert from Joule (J) to Horsepower-Hour (hp·h), multiply the value by 3.725061e-7.

Formula: hp·h = J × 3.725061e-7

Reverse: J = hp·h × 2,684,519.5377

Step-by-Step Example

Start with your value in Joule. For example: 5 J
Multiply by the conversion factor: 5 x 3.725061e-7
The result is: 1.862531e-6 hp·h

About Joule

The joule is the SI unit of energy. One joule equals the work done when a force of one newton moves an object one meter.

Common uses: physics, electrical engineering, chemistry.

About Horsepower-Hour

The horsepower-hour (hp·h) is a unit of energy and work. One horsepower-hour equals 2.684520 × 10^+6 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 Horsepower-Hour are in 1 Joule?

There are exactly 3.725061e-7 Horsepower-Hour in 1 Joule. This means the conversion factor from Joule to Horsepower-Hour is 3.725061e-7.

What is the formula to convert Joule to Horsepower-Hour?

The formula to convert Joule to Horsepower-Hour is: hp·h = J × 3.725061e-7. For example, to convert 10 Joule to Horsepower-Hour, you would multiply 10 by 3.725061e-7.

What is a Joule?