1. What is the Horsepower Formula?

The horsepower formula calculates power output from torque and rotational speed (RPM). It's a fundamental equation in mechanical engineering and automotive applications to measure engine performance.

2. How Does the Calculator Work?

The calculator uses the horsepower formula:

Where:

• \( HP \) — Horsepower (hp)
• \( T \) — Torque (lb-ft)
• \( RPM \) — Rotations per minute

Explanation: The constant 5252 comes from the relationship between rotational power and linear power, where 1 horsepower equals 550 foot-pounds per second.

3. Importance of Horsepower Calculation

Details: Horsepower calculation is essential for evaluating engine performance, comparing different engines, designing mechanical systems, and understanding vehicle capabilities.

4. Using the Calculator

Tips: Enter torque in pound-feet (lb-ft) and RPM values. Both values must be positive numbers for accurate calculation.

5. Frequently Asked Questions (FAQ)

Q1: Why is the constant 5252 used in the formula?
A: The constant 5252 comes from the conversion between foot-pounds per minute and horsepower (1 hp = 33,000 ft-lb/min ÷ 2π).

Q2: What's the difference between horsepower and torque?
A: Torque is a measure of rotational force, while horsepower is a measure of power (work done over time). Horsepower combines torque and RPM.

Q3: Can I use this formula for electric motors?
A: Yes, the formula works for any rotating machinery, including electric motors, as long as you have torque and RPM values.

Q4: What are typical horsepower values for cars?
A: Typical passenger cars range from 100-300 hp, while performance cars can have 400-700+ hp.

Q5: Does horsepower change with RPM?
A: Yes, horsepower is directly proportional to RPM when torque is constant. Most engines have a horsepower curve that peaks at a specific RPM range.