Power rate using BTU per hour.
BTU per hour to Horsepowers Converter — BTU/h to hp
Convert BTU per hour (BTU/h) to Horsepower (hp) using the exact conversion factor (1 btu per hour = 0.0003930148 horsepower). See the formula, worked examples, conversion table, history, and common uses.
BTU per hour to Horsepowers converter
Converter
Engineering Converter
Convert common stress, force, torque, power, and energy units used in engineering.
Context values
Some unit families need one extra value for a physically accurate result.
Mechanical horsepower.
Result = input x 0.2930710702 / 745.6998716.
Power units are compatible.
Reserved above the conversion cards and below the converter.
About Converting BTU per hour to Horsepowers
BTU per hour and Horsepower 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. Specifically: Power rate using BTU per hour, and mechanical horsepower.
Formula
horsepowers = btu per hour × 0.000393014778922
This factor comes from each unit's defined relationship to the category's base unit: 1 btu per hour equals 0.293071070172 base units, and 1 horsepower equals 745.699871582 base units, so dividing one by the other gives the direct btu per hour-to-horsepower factor of 0.000393014778922.
Simple example
1 BTU/h × 0.0003930147789 = 0.0003930148 hp
1 btu per hour = 0.0003930148 horsepowers.
Real-world example
100 BTU/h × 0.0003930147789 = 0.0393014779 hp
100 btu per hour = 0.0393014779 horsepowers.
Conversion table
| BTU per hour (BTU/h) | Horsepower (hp) |
|---|---|
| 1 BTU/h | 0.0003930148 hp |
| 10 BTU/h | 0.0039301478 hp |
| 50 BTU/h | 0.019650739 hp |
| 100 BTU/h | 0.0393014779 hp |
| 500 BTU/h | 0.1965073895 hp |
| 1,000 BTU/h | 0.3930147789 hp |
Reverse conversion: Horsepower to BTU per hour
0.0003930148 hp × 2544.433578 = 1.000000054 BTU/h
0.0003930148 horsepowers = 1.000000054 btu per hour.
btu per hour = horsepowers × 2544.43357764
For a page dedicated to this direction, see Horsepower to BTU per hour.
Understanding the BTU per hour (BTU/h)
Power rate using BTU per hour.
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.
Horsepower — sources
- NIST Special Publication 811 — Documents the exact watt-equivalence of mechanical horsepower.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many horsepowers are in 1 btu per hour?
1 btu per hour equals 0.0003930148 horsepowers, using the exact defined conversion factor rather than an estimate.
How do I convert btu per hour to horsepower?
Multiply the btu per hour value by 0.0003930147789. The converter above does this instantly to whatever precision you set.
How do I convert horsepower back to btu per hour?
Use the reverse factor: 1 horsepower equals 2,544.433578 btu per hour. 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.
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.
Is the btu per hour to horsepower 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.
What is the difference between 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.