Power and Energy
hptokcal/hr
Convert mechanical horsepower (hp) to kilocalories per hour (kcal/hr).
Factor1 hp = 641.1865 kcal/hr
Converter
hp
Accepts numbers or expressions, e.g. 150 + 14.7
Result
kcal/hr
Rendered to 6 significant figures.
Formula
Formula
kcal/hr = hp × 641.1865
Multiply any value in mechanical horsepower by 641.1865 to obtain the value in kilocalories per hour.
Worked example
Convert 10 hp to kcal/hr.
- 01Start with 10 hp.
- 02Multiply by the conversion factor: 10 × 641.1865 = 6411.86 kcal/hr.
Result10 hp = 6411.86 kcal/hr
Conversion table
| hp | kcal/hr |
|---|---|
| 1 | 641.19 |
| 2 | 1282.4 |
| 5 | 3205.9 |
| 10 | 6411.9 |
| 20 | 12824 |
| 50 | 32059 |
| 100 | 64119 |
| 200 | 1.2824e+5 |
| 500 | 3.2059e+5 |
| 1000 | 6.4119e+5 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the conversion factor from hp to kcal/hr?
1 hp equals 641.1865 kcal/hr. To convert, multiply the value in mechanical horsepower by 641.1865.
How do I convert 1 hp to kcal/hr?
1 hp = 641.186 kcal/hr. For any value, multiply by 641.1865.
How do I convert kcal/hr back to hp?
Divide by the same factor — or equivalently, multiply by 0.001559609. So 1 kcal/hr = 0.00155961 hp.
When would I need to convert mechanical horsepower to kilocalorie per hour?
Power conversions are common when comparing motor ratings (often kW or hp), thermal duty (BTU/hr or kW), and utility consumption in mixed-unit projects.
Is the conversion exact?
The factor shown is precise to at least 7 significant figures. For most process-engineering work this is far better than instrument accuracy. For metrology or trade applications, refer to the relevant national standard (NIST, BIPM, ISO 80000).