Convert BTU per Hour to Horsepower
Instantly convert BTU per Hour (BTU/hr) to Horsepower (hp) with our free online calculator.
Formula: BTU/hr to hp — multiply by 3.9301e-4
Reference Table
| BTU per Hour (BTU/hr) | Horsepower (hp) |
|---|---|
| 1 | 0.000393015 |
| 5 | 0.00196507 |
| 10 | 0.00393015 |
| 25 | 0.00982537 |
| 50 | 0.0196507 |
| 100 | 0.0393015 |
How to Convert BTU per Hour to Horsepower
Formula
To convert BTU per Hour (BTU/hr) to Horsepower (hp): multiply by 3.9301e-4
Step-by-Step
- Start with your value in BTU per Hour (BTU/hr).
- Multiply by 3.9301e-4 to perform the conversion.
- The result is your value expressed in Horsepower (hp).
Conversion Factor
1 BTU/hr = 0.000393015 hp
Reverse Factor
1 hp = 2544.43 BTU/hr
Worked Example
Convert 25 BTU per Hour to Horsepower: 25 BTU/hr = 0.00982537 hp
About BTU per Hour (BTU/hr)
An imperial unit of power (rate of heat transfer or thermal-energy flow), equal to ≈ 0.29307 watts per NIST SP 811 (= exactly 1/3,600 of 1,055.06 J/s in International Table form). BTU/hr is the dominant working unit for US HVAC equipment sizing per the ASHRAE Handbook, AHRI / NRCan / DOE equipment-rating standards, and the energy guide labels on every US-sold air conditioner, heat pump, water heater, and gas furnace. Reference values and the 'ton of refrigeration' convention: 12,000 BTU/hr ≈ 3.517 kW = exactly 1 'ton of refrigeration' (originally defined as the heat-removal rate to freeze 1 short ton of water in 24 hours); residential central-AC sizing 24,000-60,000 BTU/hr (2-5 tons); window AC 5,000-12,000 BTU/hr; mini-split heat pump 9,000-36,000 BTU/hr per indoor head; gas furnace input 40,000-100,000 BTU/hr residential / 200,000-500,000 BTU/hr light commercial; tank water heater 30,000-50,000 BTU/hr; tankless 150,000-200,000 BTU/hr; commercial natural-gas-fired boiler 0.5-50 million BTU/hr.
About Horsepower (hp)
An imperial unit of power equal to approximately 745.7 watts (mechanical horsepower per NIST SP 811: 1 hp = 33,000 ft·lbf/min exactly = 550 ft·lbf/s = 745.69987158227022 W). Originally defined by James Watt in the 1780s by measuring how much coal a typical pit-pony could lift from a Cornish coal mine, then scaled up to match draft-horse-team output for marketing his steam engines. Horsepower remains the dominant US power unit for: passenger-car engines (a typical sedan 150-300 hp; full-size pickup 350-450 hp; Tesla Model S Plaid 1,020 hp; Bugatti Chiron Super Sport 1,578 hp), outboard motors (Mercury Verado 600 hp), agricultural tractors (John Deere 8R 410 hp), riding lawn equipment, residential HVAC blower motors, RV gen-sets, marine inboards, and industrial electric motors per NEMA MG-1 ratings. **Important**: 'Metric horsepower' or PS / CV (Pferdestärke / Cheval Vapeur) is slightly different at exactly 735.49875 W per 1985 EU directive — a detail that matters when comparing US-spec vs European-spec engine ratings (German auto-magazine '500 PS' is ~493 US hp). Convert hp to kW by multiplying by 0.7457; to BTU/hr by multiplying by 2,544.
Quick Facts
- 1 BTU per Hour equals 0.000393015 Horsepower
- 1 Horsepower equals 2544.43 BTU per Hour
- BTU per Hour is a unit of power
- Horsepower is a unit of power
- This conversion is commonly used in electrical systems, automotive performance, and HVAC sizing
- The BTU per Hour belongs to the imperial system
Common BTU per Hour to Horsepower Conversions
| BTU per Hour (BTU/hr) | Horsepower (hp) |
|---|---|
| 0.01 | 0.00000393015 |
| 0.1 | 0.0000393015 |
| 0.25 | 0.0000982537 |
| 0.5 | 0.000196507 |
| 1 | 0.000393015 |
| 2 | 0.000786029 |
| 3 | 0.00117904 |
| 5 | 0.00196507 |
| 10 | 0.00393015 |
| 15 | 0.00589522 |
| 20 | 0.00786029 |
| 25 | 0.00982537 |
| 50 | 0.0196507 |
| 75 | 0.0294761 |
| 100 | 0.0393015 |
| 250 | 0.0982537 |
| 500 | 0.196507 |
| 1000 | 0.393015 |
| 5000 | 1.96507 |
| 10000 | 3.93015 |
Understanding BTU per Hour
The BTU per Hour (symbol: BTU/hr) is a unit of power. An imperial unit of power (rate of heat transfer or thermal-energy flow), equal to ≈ 0.29307 watts per NIST SP 811 (= exactly 1/3,600 of 1,055.06 J/s in International Table form). BTU/hr is the dominant working unit for US HVAC equipment sizing per the ASHRAE Handbook, AHRI / NRCan / DOE equipment-rating standards, and the energy guide labels on every US-sold air conditioner, heat pump, water heater, and gas furnace. Reference values and the 'ton of refrigeration' convention: 12,000 BTU/hr ≈ 3.517 kW = exactly 1 'ton of refrigeration' (originally defined as the heat-removal rate to freeze 1 short ton of water in 24 hours); residential central-AC sizing 24,000-60,000 BTU/hr (2-5 tons); window AC 5,000-12,000 BTU/hr; mini-split heat pump 9,000-36,000 BTU/hr per indoor head; gas furnace input 40,000-100,000 BTU/hr residential / 200,000-500,000 BTU/hr light commercial; tank water heater 30,000-50,000 BTU/hr; tankless 150,000-200,000 BTU/hr; commercial natural-gas-fired boiler 0.5-50 million BTU/hr.
It belongs to the imperial measurement system.
BTU per Hour are commonly used in electrical systems, automotive performance, and HVAC sizing.
Understanding Horsepower
The Horsepower (symbol: hp) is a unit of power. An imperial unit of power equal to approximately 745.7 watts (mechanical horsepower per NIST SP 811: 1 hp = 33,000 ft·lbf/min exactly = 550 ft·lbf/s = 745.69987158227022 W). Originally defined by James Watt in the 1780s by measuring how much coal a typical pit-pony could lift from a Cornish coal mine, then scaled up to match draft-horse-team output for marketing his steam engines. Horsepower remains the dominant US power unit for: passenger-car engines (a typical sedan 150-300 hp; full-size pickup 350-450 hp; Tesla Model S Plaid 1,020 hp; Bugatti Chiron Super Sport 1,578 hp), outboard motors (Mercury Verado 600 hp), agricultural tractors (John Deere 8R 410 hp), riding lawn equipment, residential HVAC blower motors, RV gen-sets, marine inboards, and industrial electric motors per NEMA MG-1 ratings. **Important**: 'Metric horsepower' or PS / CV (Pferdestärke / Cheval Vapeur) is slightly different at exactly 735.49875 W per 1985 EU directive — a detail that matters when comparing US-spec vs European-spec engine ratings (German auto-magazine '500 PS' is ~493 US hp). Convert hp to kW by multiplying by 0.7457; to BTU/hr by multiplying by 2,544.
It belongs to the imperial measurement system.
Horsepower are commonly used in electrical systems, automotive performance, and HVAC sizing.
Why Convert BTU per Hour to Horsepower?
Power conversions between BTU per Hour and Horsepower are needed in electrical engineering, automotive performance comparison, and HVAC system design. Motor ratings, generator capacities, and appliance specifications are published in different power units depending on the manufacturer and region.
Frequently Asked Questions
How do I convert BTU per Hour to Horsepower?
An imperial unit of power (rate of heat transfer or thermal-energy flow), equal to ≈ 0. To convert BTU per Hour to Horsepower, multiply by 3.9301e-4. For example, 25 BTU/hr equals 0.00982537 hp.
How many Horsepower are in 1 BTU per Hour?
There are 0.000393015 Horsepower in 1 BTU per Hour.
How many BTU per Hour are in 1 Horsepower?
There are 2544.43 BTU per Hour in 1 Horsepower.
What is the formula for BTU per Hour to Horsepower conversion?
The formula is: multiply by 3.9301e-4. This means 1 BTU/hr = 0.000393015 hp.
Is a BTU per Hour bigger than a Horsepower?
Yes. One BTU per Hour is larger than one Horsepower because 1 BTU/hr equals 0.000393015 hp, which is less than 1.
When do you need to convert between BTU per Hour and Horsepower?
An imperial unit of power equal to approximately 745. BTU per Hour and Horsepower are both power units, so conversion comes up whenever one source of information uses one unit and another uses the other — a classic cross-reference challenge in engineering, trade, travel, and everyday life.