1. What is the Horsepower Formula?

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 units)

Explanation: Horsepower is calculated by multiplying torque by RPM and dividing by the constant 5252, which comes from the relationship between rotational speed and power.

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 5252 the magic number?
A: It's the RPM at which torque and horsepower values are equal, derived from the conversion between foot-pounds per minute and horsepower.

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

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

Q4: How accurate is this calculation?
A: It's theoretically precise, but real-world factors like drivetrain loss affect actual output.

Q5: Can I use different units?
A: The formula requires torque in lb-ft and RPM. For metric units (Nm), use HP = (T × RPM) / 7121.