1. What is Torque?

Torque is a measure of rotational force that causes an object to rotate about an axis. In automotive and mechanical engineering, torque represents the twisting force produced by an engine or motor.

2. How Does the Calculator Work?

The calculator uses the torque formula:

Where:

• \( T \) — Torque in pound-feet (lb-ft)
• \( HP \) — Horsepower
• \( RPM \) — Revolutions per minute
• \( 5252 \) — Conversion constant derived from the relationship between horsepower, torque, and RPM

Explanation: The constant 5252 comes from the fact that one horsepower is defined as 550 foot-pounds per second, and there are 60 seconds in a minute, so 550 × 60 ÷ 2π ≈ 5252.

3. Importance of Torque Calculation

Details: Torque calculation is essential for engine performance analysis, vehicle acceleration assessment, gear ratio selection, and mechanical system design. It helps engineers optimize power delivery and efficiency.

4. Using the Calculator

Tips: Enter horsepower and RPM values. Both values must be positive numbers. The calculator will compute the torque in pound-feet (lb-ft).

5. Frequently Asked Questions (FAQ)

Q1: Why is the constant 5252 used in the formula?
A: The constant 5252 comes from the conversion between horsepower and torque, where 1 HP = 550 ft-lb/s and there are 60 seconds in a minute, so 550 × 60 ÷ 2π ≈ 5252.

Q2: What's the difference between torque and horsepower?
A: Torque measures rotational force, while horsepower measures the rate at which work is done. Horsepower = (Torque × RPM) ÷ 5252.

Q3: At what RPM does torque equal horsepower?
A: Torque and horsepower are numerically equal at 5252 RPM, as evident from the formula T = (HP × 5252) / RPM.

Q4: Can this formula be used for electric motors?
A: Yes, the formula applies to any rotating machinery where horsepower and RPM are known, including electric motors, internal combustion engines, and turbines.

Q5: How does torque affect vehicle performance?
A: Higher torque at lower RPM provides better acceleration and towing capacity, while horsepower determines top speed and sustained performance.