Horsepower-Hour to Megajoule Converter

Energy Converter

27 units available

Decimals:

From

To

2.68452

1 hp·h = 2.68452 MJ

Formula:

MJ = hp·h × 2.6845195377

With your value: 1 hp·h = 2.68451954 MJ

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 Megajoule conversions

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

Horsepower-Hour to Megajoule Conversion Table

Horsepower-Hour (hp·h)	Megajoule (MJ)
0.5	1.34226
1	2.68452
2	5.369039
5	13.422598
10	26.845195
15	40.267793
20	53.690391
25	67.112988
50	134.225977
100	268.451954
250	671.129884
500	1,342.259769
1000	2,684.519538

Megajoule to Horsepower-Hour Conversion Table

Megajoule (MJ)	Horsepower-Hour (hp·h)
0.5	0.186253
1	0.372506
2	0.745012
5	1.862531
10	3.725061
15	5.587592
20	7.450123
25	9.312653
50	18.625307
100	37.250614
250	93.126534
500	186.253068
1000	372.506136

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

Megajoule (MJ)

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 Megajoule

To convert from Horsepower-Hour (hp·h) to Megajoule (MJ), multiply the value by 2.6845195377.

Formula: MJ = hp·h × 2.6845195377

Reverse: hp·h = MJ × 0.372506136

Step-by-Step Example

Start with your value in Horsepower-Hour. For example: 5 hp·h
Multiply by the conversion factor: 5 x 2.6845195377
The result is: 13.422598 MJ

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 Megajoule

The megajoule (MJ) is a unit of energy and work. One megajoule equals 1.000000 × 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 Megajoule are in 1 Horsepower-Hour?

There are exactly 2.6845195377 Megajoule in 1 Horsepower-Hour. This means the conversion factor from Horsepower-Hour to Megajoule is 2.6845195377.

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

The formula to convert Horsepower-Hour to Megajoule is: MJ = hp·h × 2.6845195377. For example, to convert 10 Horsepower-Hour to Megajoule, you would multiply 10 by 2.6845195377.

What is a Horsepower-Hour?