Horsepower to BTU per hour
Type a value in horsepower to see it in BTU per hour straight away, or type in the second box to convert back.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Type the value in the horsepower box.
- Read the result in BTU per hour as you type, and pick the precision you need.
- Swap the direction to convert back, or copy the result.
How it is calculated
BTU/h = hp × 2,544.433578
Multiply the value in horsepower by 2,544.433578 to get BTU per hour.
Example
To convert 25 hp to BTU per hour: 25 × 2,544.433578 = 63,610.8 BTU/h.
Conversion table
| Horsepower (hp) | BTU per hour (BTU/h) |
|---|---|
| 1 | 2,544.43 |
| 2 | 5,088.87 |
| 3 | 7,633.3 |
| 5 | 12,722.2 |
| 10 | 25,444.3 |
| 20 | 50,888.7 |
| 25 | 63,610.8 |
| 50 | 127,222 |
| 100 | 254,443 |
| 250 | 636,108 |
| 500 | 1,272,220 |
| 1,000 | 2,544,430 |
About the units
- Horsepower
- Mechanical (imperial) horsepower is 550 foot-pounds-force per second, exactly 745.69987158227022 watts, the figure used in US car specifications.
- BTU per hour
- One BTU per hour is 1055.05585262 joules (International Table BTU) per 3600 seconds, about 0.293071 watts, the rating used for air conditioners.
Limits and caveats
- Results are rounded for display and computed with the browser's floating point precision (about 15 significant digits).
- Both unit factors are exact by their official definitions.
Questions about this tool
How many BTU per hour are in one horsepower?
1 hp = 2,544.43 BTU/h exactly.
How do I convert horsepower to BTU per hour?
Use BTU/h = hp × 2,544.433578. For example, 25 hp = 63,610.8 BTU/h.
How many horsepower are in one BTU per hour?
1 BTU/h = 0.000393015 hp.
What is the difference between mechanical and metric horsepower?
Mechanical horsepower is about 745.7 watts and is used in the US, while metric horsepower (PS) is 735.5 watts and is used in Europe and Japan. The same engine therefore shows a PS figure about 1.4% higher.
How many kilowatts is one ton of refrigeration?
One ton of refrigeration is 12000 BTU per hour, about 3.517 kW of cooling capacity. That is cooling output, not electricity use; the unit draws less power depending on its efficiency.