How many btu per hour are in 1 horsepower?

1 horsepower equals 2,544.433578 btu per hour, using the exact defined conversion factor rather than an estimate.

How do I convert horsepower to btu per hour?

Multiply the horsepower value by 2544.433578. The converter above does this instantly to whatever precision you set.

How do I convert btu per hour back to horsepower?

Use the reverse factor: 1 btu per hour equals 0.0003930148 horsepowers. You can also use the swap control in the converter above to flip the direction instantly.

What is a btu per hour?

BTU per hour (BTU/h) is a unit of engineering.

Is the horsepower to btu per hour conversion exact?

Yes. Mechanical horsepower is defined as exactly 745.6998715822702 watts. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.

Horsepowers to BTU per hour Converter

Q: What is a horsepower?

Horsepower (hp) measures power. Mechanical horsepower is defined as exactly 745.6998715822702 watts. It is classified as a US/imperial customary unit.

About Converting Horsepowers to BTU per hour

Horsepower and BTU per hour both measure a quantity used in structural or mechanical engineering — commonly stress, pressure, force, torque, power, or energy — where converting between the unit conventions used in different regions, industries, or equipment specifications is a routine part of design work. Horsepower is most often used for us and uk vehicle engine power ratings.

Formula

btu per hour = horsepowers × 2544.43357764

This factor comes from each unit's defined relationship to the category's base unit: 1 horsepower equals 745.699871582 base units, and 1 btu per hour equals 0.293071070172 base units, so dividing one by the other gives the direct horsepower-to-btu per hour factor of 2544.43357764.

Simple example

1 hp × 2544.433578 = 2,544.433578 BTU/h

1 horsepower = 2,544.433578 btu per hour.

Real-world example

100 hp × 2544.433578 = 254,443.3578 BTU/h

100 horsepowers = 254,443.3578 btu per hour.

Conversion table

Horsepower (hp)	BTU per hour (BTU/h)
1 hp	2,544.433578 BTU/h
10 hp	25,444.33578 BTU/h
50 hp	127,221.6789 BTU/h
100 hp	254,443.3578 BTU/h
500 hp	1,272,216.789 BTU/h
1,000 hp	2,544,433.578 BTU/h

Reverse conversion: BTU per hour to Horsepower

1 BTU/h × 0.0003930147789 = 0.0003930148 hp

1 btu per hour = 0.0003930148 horsepowers.

horsepowers = btu per hour × 0.000393014778922

For a page dedicated to this direction, see BTU per hour to Horsepower.

Understanding the Horsepower

Horsepower (hp) measures power. Mechanical horsepower is defined as exactly 745.6998715822702 watts. It is classified as a US/imperial customary unit.

Where it's used: United States and United Kingdom (vehicle and engine specifications)

Mechanical horsepower vs. metric horsepower. Mechanical horsepower (745.7 W) and metric horsepower/PS (735.5 W) differ by about 1.4% — a US car spec sheet in 'hp' and a European one in 'PS' are not directly comparable numbers without conversion.

Uses of the Horsepower today

US and UK vehicle engine power ratings
Motor and engine specifications in English-speaking markets

History of the Horsepower

James Watt popularized horsepower in the 1780s as a marketing figure, comparing his steam engines' output to the working capacity of a horse (based on his estimate of a horse turning a mill), so buyers could grasp engine capability in familiar terms. The unit stuck long after its origin as a sales tool, eventually being formally defined at exactly 550 foot-pounds per second.

Historical origin. Horsepower was not the invention of a single named person; it developed through the process described above.

Understanding the BTU per hour (BTU/h)

Power rate using BTU per hour.

Horsepower — sources

NIST Special Publication 811 — Documents the exact watt-equivalence of mechanical horsepower.

Horsepowers to BTU per hour Converter — hp to BTU/h

Engineering Converter