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    Horsepower Calculator | Convert Watts, Torque & RPM to HP

    Created by Md jony islam

    Horsepower Conversion Calculator

    Calculate horsepower easily from watts, torque, or RPM using our online Horsepower Calculator. Convert between mechanical, electrical, and metric HP for accurate results. Utility users need a horsepower calculator to evaluate motor and engine power output when they enter their voltage and current and efficiency and power factor parameters for both single-phase and three-phase systems. The calculated horsepower output enables users to choose appropriate motor or engine models.

    Horsepower Calculator

    Horsepower Calculator
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    What do you need to know to calculate Horsepower?

    The determination of horsepower demands particular data points matching the selected system type. The calculation of mechanical horsepower involves multiplying torque by RPM, then diving by 5252. The formula to calculate horsepower in single-phase electrical systems is HP = (V × I × Efficiency × PF) / 746, and three-phase power requires the calculation HP = (√3 × V × I × Efficiency × PF) / 746. Hydraulic systems determine their horsepower through the calculation HP = (Pressure × Flow) / 1714. Horsepower can be determined by the pairwise multiplication of force and velocity, then divided by 33,000. The ability to understand these mathematical concepts makes it possible to perform exact horsepower evaluations of motors and engines as well as fluid systems.

    🙋 Try our Total Current Calculator . If you want to learn more about conversions using Electrical Engineering Project Calculators.

    Conversion using the Horsepower Calculation Formula

    To calculate horsepower (HP) for single-phase and three-phase electrical systems, use the following formulas:

    How to Calculate Single-Phase Horsepower Formula.

    HP = Voltage × Current × η × Power factor746

    How to Calculate Three-Phase Horsepower Formula.

    For three-phase systems, it is:

    HP = √3 × Voltage × Current × η × Power factor746

    Suggested Reading

    Horsepower conversion chart

    System TypeVoltage (V)Current (I) [A]EfficiencyPower Factor (PF)Horsepower (HP)
    Single-phase120100.850.91.10
    Single-phase240150.90.956.11
    Single-phase480200.95119.05
    Three-phase415150.90.855.82
    Three-phase400300.920.9528.07
    Three-phase690400.95177.28

    Frequently Asked Questions - HorsePower Calculate Conversion FAQs:

    How do you calculate horsepower in mechanical systems?

    To determine horsepower, divide torque by rotational speed and multiply by 5,252, where torque uses lb-ft units and RPM stands for rotational speed. Anyone who uses 200 lb-ft torque at a speed of 3000 RPM will get 114.2 HP.

    What is the relationship between horsepower and electrical power?

    One horsepower equals 746 watts of electrical power. The estimation of electrical HP starts by using HP = (Volts × Amps × PF × √3) / 746 for three-phase systems and HP = (Volts × Amps × PF) / 746 for single-phase circuits.

    How do you calculate horsepower for pump applications?

    The formula to calculate pump horsepower requires (Flow × Head × SG) / (3960 × Efficiency), where Flow is measured in GPM, Head indicates feet, and SG stands for specific gravity. This determines required motor size.

    Why is horsepower calculation important for motor selection?

    By conducting horsepower calculations, users can determine the right motor size as well as the energy requirements and the appropriate application limitations. The system checks equipment performance against load needs to guarantee proper operation.

    How do you calculate horsepower losses in mechanical systems?

    The power loss calculation should be HP Loss = Input HP - Output HP. A system displaying 50 HP input and 45 HP output reveals an efficiency of 90% because there are 5 HP of power lost.

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    About the Author

    Md Jony Islam

    Md Jony Islam: Multidisciplinary Engineer & Financial Expert:

    Md. Jony Islam is a highly skilled professional with expertise in electronics, electrical, mechanical, and civil engineering, as well as finance. Specializing in transformer service and maintenance for 33/11kV substations, he ensures reliable and efficient electrical systems. His mechanical engineering skills drive innovative designs, while his financial acumen supports effective project budgeting. With a strong foundation in civil engineering, he contributes to robust infrastructure development. Md. Jony Islam's multidisciplinary approach ensures efficiency, quality, and reliability across all projects.