Watt-Hour to Horsepower-Hour Converter

Energy Converter

27 units available

Decimals:

From

To

0.001341

1 Wh = 0.001341 hp·h

Formula:

hp·h = Wh × 0.0013410221

With your value: 1 Wh = 0.00134102 hp·h

How big is that?

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

Heartbeat (1/3.6e+3 your value)0.000278 Wh

Your value1.00 Wh

AA battery charge (2.8× your value)2.78 Wh

Slice of bread (78× your value)77.8 Wh

Daily food intake (2.3e+3× your value)2.33e+3 Wh

Litre of petrol (9.5e+3× your value)9.50e+3 Wh

Other Watt-Hour to Horsepower-Hour conversions

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

Watt-Hour to Horsepower-Hour Conversion Table

Watt-Hour (Wh)	Horsepower-Hour (hp·h)
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-Hour to Watt-Hour Conversion Table

Horsepower-Hour (hp·h)	Watt-Hour (Wh)
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	372,849.935792
1000	745,699.871583

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.

Watt-Hour (Wh)

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 Watt-Hour to Horsepower-Hour

To convert from Watt-Hour (Wh) to Horsepower-Hour (hp·h), multiply the value by 0.0013410221.

Formula: hp·h = Wh × 0.0013410221

Reverse: Wh = hp·h × 745.6998715833

Step-by-Step Example

Start with your value in Watt-Hour. For example: 5 Wh
Multiply by the conversion factor: 5 x 0.0013410221
The result is: 0.006705 hp·h

About Watt-Hour

The watt-hour (Wh) is a unit of energy and work. One watt-hour equals 3600 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.

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 Watt-Hour?

There are exactly 0.0013410221 Horsepower-Hour in 1 Watt-Hour. This means the conversion factor from Watt-Hour to Horsepower-Hour is 0.0013410221.

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

The formula to convert Watt-Hour to Horsepower-Hour is: hp·h = Wh × 0.0013410221. For example, to convert 10 Watt-Hour to Horsepower-Hour, you would multiply 10 by 0.0013410221.

What is a Watt-Hour?