1. What is a Horsepower Calculator by Torque and RPM?

Definition: This calculator determines the horsepower output based on torque and rotational speed (RPM).

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

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( HP \) — Horsepower (mechanical power output)
• \( T \) — Torque (pound-feet)
• \( RPM \) — Rotational speed (revolutions per minute)
• 5252 — Conversion constant (derived from the relationship between power, torque, and angular velocity)

Explanation: Horsepower is calculated by multiplying torque by RPM and dividing by the constant 5252.

3. Importance of Horsepower Calculation

Details: Understanding horsepower helps in engine performance analysis, vehicle design, and mechanical system evaluation.

4. Using the Calculator

Tips: Enter torque in pound-feet and rotational speed in RPM. All values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is the constant 5252 used?
A: 5252 is derived from the conversion between foot-pounds per minute and horsepower (1 HP = 33,000 ft-lb/min).

Q2: What's a typical torque value for cars?
A: Passenger cars typically produce 100-300 lb-ft, while trucks may produce 300-1000 lb-ft.

Q3: Does this formula work for electric motors?
A: Yes, the formula applies to any rotating mechanical system.

Q4: What if I have metric units?
A: Convert Newton-meters to lb-ft (1 Nm = 0.7376 lb-ft) before using this calculator.

Q5: Why does horsepower equal torque at 5252 RPM?
A: This is where the two curves cross on a dyno chart due to the mathematical relationship in the formula.