To convert horsepower hours to kilojoules, multiply by 2684.519538.
The calculation uses 1 hp·h = 2684.519538 kJ. Results are displayed to at most 10 significant digits. Definitions can be exact while a displayed decimal is rounded. Match the displayed precision to your original measurement.
The formula
value in kJ = value in hp·h × 2684.519538
hp·h- Input unit: horsepower hours
kJ- Output unit: kilojoules
How to use this calculator
- Enter a value in hp·h.
- Multiply by the stored conversion factor.
- Read the result in kJ; divide by the same factor to convert back.
Worked examples
Worked conversion
1 hp·h × 2684.519538 ≈ 2684.519538 kJ.
Reverse conversion
2684.519538 kJ ÷ 2684.519538 ≈ 1 hp·h. Rounding intermediate values can change the last displayed digit.
Frequently asked questions
What factor does this converter use?
It uses 2684.519538 kJ per hp·h.
Why can another converter show a slightly different answer?
Check the unit convention first (such as US versus Imperial or decimal versus binary), then compare rounding. Measurement uncertainty is separate from the unit conversion.
hp·h to kJ table
| hp·h | kJ (rounded) |
|---|---|
| 0 | 0 |
| 1 | 2684.519538 |
| 2 | 5369.039075 |
| 5 | 13422.59769 |
| 10 | 26845.19538 |
| 100 | 268451.9538 |
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