Gigajoule to Horsepower-Hour Converter

Energy Converter

27 units available

Decimals:

From

To

372.506136

1 GJ = 372.506136 hp·h

Formula:

hp·h = GJ × 372.5061359981

With your value: 1 GJ = 372.506136 hp·h

How big is that?

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

Heartbeat (1/1.0e+9 your value)1.00e-9 GJ

AA battery charge (1/1.0e+5 your value)0.0000100 GJ

Slice of bread (1/3.6e+3 your value)0.000280 GJ

Daily food intake (1/1.2e+2 your value)0.00840 GJ

Litre of petrol (1/29 your value)0.0342 GJ

Your value1.00 GJ

Other Gigajoule to Horsepower-Hour conversions

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

Gigajoule to Horsepower-Hour Conversion Table

Gigajoule (GJ)	Horsepower-Hour (hp·h)
0.5	186.253068
1	372.506136
2	745.012272
5	1,862.53068
10	3,725.06136
15	5,587.59204
20	7,450.12272
25	9,312.6534
50	18,625.3068
100	37,250.6136
250	93,126.534
500	186,253.067999
1000	372,506.135998

Horsepower-Hour to Gigajoule Conversion Table

Horsepower-Hour (hp·h)	Gigajoule (GJ)
0.5	0.001342
1	0.002685
2	0.005369
5	0.013423
10	0.026845
15	0.040268
20	0.05369
25	0.067113
50	0.134226
100	0.268452
250	0.67113
500	1.34226
1000	2.68452

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.

Gigajoule (GJ)

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 Gigajoule to Horsepower-Hour

To convert from Gigajoule (GJ) to Horsepower-Hour (hp·h), multiply the value by 372.5061359981.

Formula: hp·h = GJ × 372.5061359981

Reverse: GJ = hp·h × 0.0026845195

Step-by-Step Example

Start with your value in Gigajoule. For example: 5 GJ
Multiply by the conversion factor: 5 x 372.5061359981
The result is: 1,862.53068 hp·h

About Gigajoule

The gigajoule (GJ) is a unit of energy and work. One gigajoule equals 1.000000 × 10^+9 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 Gigajoule?

There are exactly 372.5061359981 Horsepower-Hour in 1 Gigajoule. This means the conversion factor from Gigajoule to Horsepower-Hour is 372.5061359981.

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

The formula to convert Gigajoule to Horsepower-Hour is: hp·h = GJ × 372.5061359981. For example, to convert 10 Gigajoule to Horsepower-Hour, you would multiply 10 by 372.5061359981.

What is a Gigajoule?