Horsepower-Hour to Kilojoule Converter

Energy Converter

27 units available

Decimals:

From

To

2,684.519538

1 hp·h = 2,684.519538 kJ

Formula:

kJ = hp·h × 2,684.5195377

With your value: 1 hp·h = 2,684.5195377 kJ

How big is that?

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

Heartbeat (1/2.7e+6 your value)3.73e-7 hp·h

AA battery charge (1/2.7e+2 your value)0.00373 hp·h

Slice of bread (1/9.6 your value)0.104 hp·h

Your value1.00 hp·h

Daily food intake (3.1× your value)3.13 hp·h

Litre of petrol (13× your value)12.7 hp·h

Other Horsepower-Hour to Kilojoule conversions

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

Horsepower-Hour to Kilojoule Conversion Table

Horsepower-Hour (hp·h)	Kilojoule (kJ)
0.5	1,342.259769
1	2,684.519538
2	5,369.039075
5	13,422.597689
10	26,845.195377
15	40,267.793066
20	53,690.390754
25	67,112.988443
50	134,225.976885
100	268,451.95377
250	671,129.884425
500	1,342,259.76885
1000	2,684,519.5377

Kilojoule to Horsepower-Hour Conversion Table

Kilojoule (kJ)	Horsepower-Hour (hp·h)
0.5	0.000186
1	0.000373
2	0.000745
5	0.001863
10	0.003725
15	0.005588
20	0.00745
25	0.009313
50	0.018625
100	0.037251
250	0.093127
500	0.186253
1000	0.372506

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-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

Kilojoule (kJ)

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 Horsepower-Hour to Kilojoule

To convert from Horsepower-Hour (hp·h) to Kilojoule (kJ), multiply the value by 2,684.5195377.

Formula: kJ = hp·h × 2,684.5195377

Reverse: hp·h = kJ × 0.0003725061

Step-by-Step Example

Start with your value in Horsepower-Hour. For example: 5 hp·h
Multiply by the conversion factor: 5 x 2,684.5195377
The result is: 13,422.597689 kJ

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.

About Kilojoule

The kilojoule (kJ) is a unit of energy and work. One kilojoule equals 1000 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 Kilojoule are in 1 Horsepower-Hour?

There are exactly 2,684.5195377 Kilojoule in 1 Horsepower-Hour. This means the conversion factor from Horsepower-Hour to Kilojoule is 2,684.5195377.

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

The formula to convert Horsepower-Hour to Kilojoule is: kJ = hp·h × 2,684.5195377. For example, to convert 10 Horsepower-Hour to Kilojoule, you would multiply 10 by 2,684.5195377.

What is a Horsepower-Hour?