1. What Is Torque?

Torque is a measure of the rotational force applied to an object. In automotive and mechanical engineering, torque 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 (lb-ft)
• \( HP \) — Horsepower
• \( RPM \) — Revolutions per minute
• \( 5252 \) — Conversion constant derived from the relationship between horsepower, torque, and rotational speed

Explanation: The constant 5252 comes from the definition of horsepower (1 hp = 550 ft-lb/s) and the conversion from minutes to seconds. At 5252 RPM, horsepower and torque are numerically equal.

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 5252 the magic number in the formula?
A: 5252 is derived from the definition of horsepower (1 hp = 550 ft-lb/s) and the conversion from minutes to seconds (60 seconds/minute × 550/2π ≈ 5252).

Q2: What is the relationship between torque and horsepower?
A: Horsepower is a function of torque and RPM. High torque at low RPM provides good acceleration, while high horsepower at high RPM indicates top speed potential.

Q3: Can I use this calculator for electric motors?
A: Yes, the formula applies to any rotational system where horsepower and RPM are known, including electric motors, internal combustion engines, and turbines.

Q4: What are typical torque values for different engines?
A: Passenger cars: 100-300 lb-ft, trucks: 400-1000+ lb-ft, sports cars: 300-700 lb-ft. Values vary significantly based on engine size and design.

Q5: How does torque affect vehicle performance?
A: Higher torque improves acceleration and towing capacity. The torque curve (torque vs RPM) determines how the vehicle delivers power across different speed ranges.