1. What is Torque?

Torque is a measure of the rotational force applied to an object. In automotive and mechanical engineering, it represents the twisting force that causes rotation, measured in pound-feet (lb-ft) or Newton-meters (N·m).

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
• \( 5252 \) — 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 2π radians in one revolution. The formula shows the inverse relationship between torque and RPM for a given horsepower.

3. Importance of Torque Calculation

Details: Torque calculation is essential for engine performance analysis, transmission design, vehicle acceleration prediction, and mechanical system optimization. It helps engineers understand the pulling power and low-end performance of engines.

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). For accurate results, use consistent units throughout.

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: 1 HP = 550 ft-lb/s and there are 2π radians per revolution, so 550 × 60 ÷ (2π) ≈ 5252.

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

Q3: At what RPM does horsepower equal torque?
A: Horsepower and torque are numerically equal at 5252 RPM, as evident from the formula when T = HP.

Q4: Can I use this formula for electric motors?
A: Yes, the formula works for any rotational power system, including electric motors, internal combustion engines, and turbines.

Q5: How do I convert lb-ft to N·m?
A: Multiply lb-ft by 1.35582 to get Newton-meters (N·m). This conversion is important for international engineering standards.