1. What is the Horsepower Formula?

Definition: This calculator computes horsepower based on torque and RPM using the standard mechanical horsepower formula.

Purpose: It helps engineers, mechanics, and automotive enthusiasts determine engine power output.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( HP \) — Horsepower
• \( T \) — Torque (pound-feet)
• \( RPM \) — Revolutions per minute
• 5252 — Conversion constant (derived from the relationship between rotational work and time)

Explanation: Horsepower represents the rate at which work is done, combining both torque and rotational speed.

3. Importance of Horsepower Calculation

Details: Accurate horsepower calculation is essential for engine performance analysis, vehicle design, and mechanical system evaluation.

4. Using the Calculator

Tips: Enter the torque in pound-feet and RPM (revolutions per minute). All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is the constant 5252 used?
A: 5252 comes from (33,000 ft-lb/min) / (2π radians/revolution), converting rotational work to horsepower.

Q2: What's the relationship between HP and torque?
A: Horsepower = (Torque × RPM) / 5252. At 5252 RPM, horsepower equals torque numerically.

Q3: Can I use metric units?
A: This calculator uses imperial units. For metric (Nm and RPM), use HP = (T × RPM) / 7121 instead.

Q4: What's a typical torque value for cars?
A: Passenger cars typically have 100-300 lb-ft, while trucks may have 300-1000 lb-ft.

Q5: Does this work for electric motors?
A: Yes, the formula applies to any rotating machinery, including electric motors.