Enter one value (BTU/hr, watts/kW, or horsepower) into the calculator to determine the other two.
BTU Per Hour Formula
The following formulas are used to convert watts or horsepower into BTU per hour (BTU/hr).
\text{BTU/hr} = W \times 3.412141633
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\text{BTU/hr} = \text{hp} \times 2544.43358Variables:
- BTU/hr is British thermal units per hour (a unit of power).
- W is the power in watts.
- hp is the power in mechanical horsepower.
To convert watts to BTU/hr, multiply the power in watts by 3.412141633. To convert horsepower (mechanical hp) to BTU/hr, multiply the power in horsepower by 2544.43358.
What is BTU Per Hour?
BTU per hour (BTU/hr) is a unit of power used to describe the rate at which energy is used or produced. One BTU is approximately the amount of energy needed to raise the temperature of one pound of water by one degree Fahrenheit (the exact value depends on the BTU definition used). When expressed as BTU per hour, it indicates the amount of energy transferred or consumed per hour. This unit is commonly used in heating, ventilation, and air conditioning (HVAC) systems to measure the capacity of heating and cooling equipment.
How to Calculate BTU Per Hour?
The following steps outline how to calculate the BTU per hour.
- First, identify the known power value you have (in BTU/hr, W/kW, or horsepower).
- Next, convert the known value to watts (W) if needed (kW × 1000, BTU/hr ÷ 3.412141633, or hp × 745.6998716).
- Next, calculate BTU/hr using the formula BTU/hr = W × 3.412141633.
- Finally, calculate horsepower (if desired) using hp = W ÷ 745.6998716.
- After inserting the value and calculating the result, check your answer with the calculator above.
Example Problem :
Use the following variables as an example problem to test your knowledge.
Power in watts (W) = 1000
BTU/hr = 1000 × 3.412141633 = 3412.1416 BTU/hr, and hp = 1000 ÷ 745.6998716 = 1.3410 hp.