1. What is the Horsepower Formula?

Definition: This calculator computes mechanical horsepower based on torque and rotational speed (RPM).

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)
• \( RPM \) — Rotations per minute
• 5252 — Conversion constant (derived from the relationship between rotational speed and power)

Explanation: Horsepower is directly proportional to both torque and RPM. The constant 5252 comes from the conversion between foot-pounds per minute and horsepower.

3. Importance of Horsepower Calculation

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

4. Using the Calculator

Tips: Enter torque in pound-feet and engine speed in RPM. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: Why is the constant 5252 used?
A: 5252 RPM is where torque and horsepower values intersect on dyno charts (1 HP = 550 ft-lb/sec, converted to RPM).

Q2: What's a typical torque value for cars?
A: Passenger cars typically range 100-300 lb-ft, while performance vehicles can exceed 500 lb-ft.

Q3: Does this work for electric motors?
A: Yes, the formula applies to all rotational power systems, including electric motors.

Q4: How do I measure torque?
A: Torque is typically measured with a dynamometer or torque wrench in controlled conditions.

Q5: Why does horsepower vary with RPM?
A: Because horsepower depends on both torque and RPM, and most engines have torque curves that vary with RPM.