Horsepower-Hour to Gigajoule Converter
Quick answer
To convert Horsepower-Hours to Gigajoules, multiply by 0.0026845195 (or divide by 372.5061359981). Therefore, 1 Horsepower-Hour (hp·h) equals 0.00268452 Gigajoules (GJ).
Formula: GJ = hp·h × 0.0026845195. Worked example: 10 hp·h = 0.026845 GJ.
Convert Horsepower-Hour (hp·h) to Gigajoule (GJ) online with our free unit converter. In energy, 1 hp·h = 0.002685 GJ. Explore step-by-step conversion steps, mathematical formulas, and quick conversion reference tables below.
Worked example: converting Horsepower-Hour to Gigajoule
- Step 1 — start with the formula. GJ = hp·h × 0.0026845195
- Step 2 — substitute your figure. 10 hp·h × 0.0026845195
- Step 3 — read the result. 10 hp·h = 0.026845 GJ
- Step 4 — check it in reverse. hp·h = GJ × 372.5061359981 returns 9.9999 hp·h, which matches the figure you started with.
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1 hp·h = 0.002685 GJ
Formula:
GJ = hp·h × 0.0026845195With your value: 1 hp·h = 0.00268452 GJ
How big is that?
Everyday references on a logarithmic scale, all expressed in horsepower-hour so you can sanity-check the result.
Other Horsepower-Hour to Gigajoule conversions
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 |
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 |
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
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
Gigajoule (GJ)
Energy
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 Gigajoule
To convert from Horsepower-Hour (hp·h) to Gigajoule (GJ), multiply the value by 0.0026845195.
Formula: GJ = hp·h × 0.0026845195
Reverse: hp·h = GJ × 372.5061359981
Step-by-Step Example
- Start with your value in Horsepower-Hour. For example: 5 hp·h
- Multiply by the conversion factor: 5 x 0.0026845195
- The result is: 0.013423 GJ
Horsepower-Hour and Gigajoule Relationship
This calculation facilitates standardized conversion between recognized units of energy. Since 1 Horsepower-Hour represents a fraction of a Gigajoule (1 Gigajoule ≈ 372.5061 Horsepower-Hours), the Gigajoule is the larger measurement interval. Understanding the relationship between Horsepower-Hour and Gigajoule is essential for accurate calculations in physics, engineering, commerce, and daily applications.
About Horsepower-Hour
The Horsepower-Hour (symbol: hp·h) is a recognized unit in the Standard measurement framework, utilized within energy applications for precision and standardized data representation.
Common uses of Horsepower-Hour: energy calculations, engineering and science, education.
About Gigajoule
The Gigajoule (symbol: GJ) is a recognized unit in the Metric (SI) measurement framework, utilized within energy applications for precision and standardized data representation.
Common uses of Gigajoule: energy calculations, engineering and science, education.
Frequently Asked Questions
- How many Gigajoules are in 1 Horsepower-Hour?
- There are exactly 0.0026845195 Gigajoules in 1 Horsepower-Hour. This means the conversion factor from Horsepower-Hour to Gigajoule is 0.0026845195.
- What is the formula to convert Horsepower-Hour to Gigajoule?
- The formula to convert Horsepower-Hour to Gigajoule is: GJ = hp·h × 0.0026845195. For example, to convert 10 Horsepower-Hours to Gigajoules, you would multiply 10 by 0.0026845195.
- What is a Horsepower-Hour?
- The Horsepower-Hour (symbol: hp·h) is a recognized unit in the Standard measurement framework, utilized within energy applications for precision and standardized data representation.
- What is a Gigajoule?
- The Gigajoule (symbol: GJ) is a recognized unit in the Metric (SI) measurement framework, utilized within energy applications for precision and standardized data representation.
- What are the common uses of Horsepower-Hour?
- The Horsepower-Hour is commonly used in energy calculations, engineering and science, education.
Related Energy Conversions
Cite this page
UnitConvertLab. (2026). Horsepower-Hour to Gigajoule converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/horsepower_hour-to-gigajoule