1. What is the Horsepower Equation?

Definition: This calculator computes horsepower from 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 speed and power)

Explanation: The formula shows that horsepower is directly proportional to both torque and rotational speed.

3. Importance of Horsepower Calculation

Details: Horsepower is a crucial measurement for engine performance, vehicle capabilities, and mechanical system design.

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?
A: 5252 comes from (33,000 ft-lb/min) / (2π radians/revolution), which converts the units to horsepower.

Q2: At what RPM does torque equal horsepower?
A: At exactly 5252 RPM, torque and horsepower values will be numerically equal.

Q3: Can I use metric units?
A: This calculator uses imperial units. For metric (Nm and kW), a different formula is needed.

Q4: What's a typical torque value for cars?
A: Passenger cars typically produce 100-400 lb-ft of torque, while trucks may produce 400-1000+ lb-ft.

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