To convert horsepower hours to kilocalories, multiply by 641.6155683.
The calculation uses 1 hp·h = 641.6155683 kcal. 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.
Uses the thermochemical kilocalorie, 4,184 J.
The formula
value in kcal = value in hp·h × 641.6155683
hp·h- Input unit: horsepower hours
kcal- Output unit: kilocalories
How to use this calculator
- Enter a value in hp·h.
- Multiply by the stored conversion factor.
- Read the result in kcal; divide by the same factor to convert back.
Worked examples
Worked conversion
1 hp·h × 641.6155683 ≈ 641.6155683 kcal.
Reverse conversion
641.6155683 kcal ÷ 641.6155683 ≈ 1 hp·h. Rounding intermediate values can change the last displayed digit.
Frequently asked questions
What factor does this converter use?
It uses 641.6155683 kcal per hp·h. Uses the thermochemical kilocalorie, 4,184 J.
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 kcal table
| hp·h | kcal (rounded) |
|---|---|
| 0 | 0 |
| 1 | 641.6155683 |
| 2 | 1283.231137 |
| 5 | 3208.077841 |
| 10 | 6416.155683 |
| 100 | 64161.55683 |
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