Horsepower (mechanical) to BTU per hour Converter
Convert Horsepower (mechanical) (hp) to BTU per hour (BTU/h) instantly, or use the conversion table below to look up common values.
Horsepower (mechanical) to BTU per hour conversion table
| Horsepower (mechanical) (hp) | BTU per hour (BTU/h) |
|---|---|
| 1 | 2,544.433579 |
| 2 | 5,088.867158 |
| 3 | 7,633.300737 |
| 4 | 10,177.734317 |
| 5 | 12,722.167896 |
| 10 | 25,444.335791 |
| 25 | 63,610.839478 |
| 50 | 127,221.678957 |
| 100 | 254,443.357914 |
How to convert Horsepower (mechanical) to BTU per hour
1 hp equals 2,544.433579 BTU/h. Use the converter above for any value, or read the table for common conversions.
BTU/h = hp × 2544.433579139252 · hp = BTU/h × 0.00039301477869125066Multiply a horsepower (mechanical) figure by 2,544.433579 to get btu per hour, or divide it by 3.9301e-4 to go the other way.
Worked examples
- 1 hp= 2,544.433579 BTU/h
- 5 hp= 12,722.167896 BTU/h
- 10 hp= 25,444.335791 BTU/h
- 100 hp= 254,443.357914 BTU/h
- 500 hp= 1,272,216.78957 BTU/h
What these units are
Horsepower (mechanical) (hp). Mechanical horsepower is 745.7 watts, the unit used for engine and motor output in the United States and UK. It is a different size from metric horsepower.
BTU per hour (BTU/h). One BTU per hour is 0.29307107 watts. It is used for air-conditioning and heating capacity, where '12,000 BTU' means roughly 3.5 kW.
Metric power conversions are exact. Check whether a horsepower figure is mechanical or metric before comparing two engines.
Converting Horsepower (mechanical) to BTU per hour in practice
Working in horsepower (mechanical)
Mechanical horsepower is exactly 745.7 watts, and metric horsepower is exactly 735.49875 watts. The two definitions differ by about 1.4 percent, so a figure carries a larger number in mechanical horsepower.
Vehicle engine output, pump and compressor motors, and agricultural machinery are commonly rated in horsepower. Metric horsepower is used for engine figures in much of Europe and Asia, while mechanical horsepower dominates in the United States.
Power is a rate, so multiplying horsepower by a running time gives an energy amount in joules or watt-hours. The gap of about 1.4 percent between the two horsepower definitions is carried through every conversion to watts.
Comparing two engine ratings without knowing which horsepower definition applies is the usual error, and the numbers are not interchangeable. The definition behind a figure should always be established before it is converted.
Horsepower is the unit for engine output, while kilowatts fit appliances, generators and inverters, and BTU per hour fits heating and cooling equipment. Metric horsepower is a separate sibling, so a PS figure and an hp figure differ even when they describe the same engine.
Reading the result in btu per hour
One BTU per hour is exactly 0.29307107017222 watts, because one BTU is exactly 1,055.05585262 joules and an hour holds 3,600 seconds. The symbol is BTU/h.
Air conditioners, heat pumps, furnaces and chillers are rated in BTU per hour, and the figure on a room air conditioner describes its cooling capacity. Heating and cooling engineering uses the same unit for equipment sizing.
BTU per hour measures a rate, so it must be multiplied by a duration to produce an energy amount. Converting it to watts uses the exact factor, and 12,000 BTU per hour works out to about 3.5 kilowatts.
Treating BTU per hour as a unit of energy is a common error, since the same letters without the time element name an amount. A capacity rating and a consumption figure are therefore different quantities.
Cooling and heating capacities are quoted in BTU per hour, the electrical draw of the same equipment is quoted in kilowatts, and its motor may be quoted in horsepower. Choosing the wrong sibling changes the number by a factor of more than three.
Checking a horsepower (mechanical) to btu per hour conversion
Within the metric units a power conversion is a power of a thousand: watts to kilowatts, kilowatts to megawatts, and back. Those pairs are decimal shifts and a reader can do them without a converter.
Anything involving horsepower is a multiplication by a definition rather than a shift, and there are two definitions. Mechanical horsepower is exactly 745.7 watts and metric horsepower exactly 735.49875 watts, so the same engine carries a larger figure in mechanical horsepower than in metric.
When checking a power conversion, convert to watts first, because every unit in this dimension is defined against the watt and the intermediate value makes the comparison obvious. The trap is comparing a horsepower figure with a kilowatt figure without establishing which horsepower was quoted.
Tanzania reference points
Real quantities, converted into the units on this page.
Tanzania's installed electricity generation capacity
2,881.332 MW = 3,863,929.859457 hp = 9,831,512,881.841255 BTU/h
EWURA reports 2,842.96 MW on the main grid and 38.372 MW off-grid, with TANESCO holding 92.31% of it. Installed capacity is what the country could generate at once, not what it generates on an average day.
Source: EWURA Fact Sheet — electricity sub-sector (installed capacity) · verified 2026-09-14
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