1. What is a Horsepower Calculator from Torque?

Definition: This calculator estimates engine horsepower based on torque and RPM (revolutions per minute).

Purpose: It helps automotive professionals, engineers, and enthusiasts determine engine power output when torque values are known.

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 work and time)

Explanation: Horsepower is calculated by multiplying torque by RPM and dividing by the constant 5252, which comes from the definition of horsepower (33,000 ft-lb per minute).

3. Importance of Horsepower Calculation

Details: Understanding the relationship between torque and horsepower helps in engine performance analysis, vehicle tuning, 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 derived from the definition of horsepower (1 HP = 33,000 ft-lb/min) and unit conversions (2π radians per revolution).

Q2: Do torque and HP curves always cross at 5252 RPM?
A: Yes, when using pound-feet and HP units, the curves will always intersect at 5252 RPM due to the formula relationship.

Q3: What's the difference between torque and horsepower?
A: Torque measures rotational force, while horsepower measures the rate at which work is done (power).

Q4: Can I use this for electric motors?
A: Yes, the formula works for any rotating machinery where torque and RPM can be measured.

Q5: How accurate is this calculation?
A: It's theoretically precise, but real-world factors like drivetrain losses may affect actual delivered power.