1. What is the Torque Formula?

The torque formula calculates rotational force from horsepower and rotational speed. This fundamental mechanical engineering equation is widely used in automotive, industrial, and mechanical applications to determine the twisting force produced by engines and motors.

2. How Does the Calculator Work?

The calculator uses the torque formula:

Where:

• \( T \) — Torque in pound-feet (lb-ft)
• \( HP \) — Horsepower (hp)
• \( RPM \) — Rotational speed in revolutions per minute (rev/min)
• \( 5252 \) — Conversion constant derived from the relationship between horsepower, torque, and rotational speed

Explanation: The constant 5252 comes from the mathematical relationship where one horsepower is defined as 550 foot-pounds per second, and there are 60 seconds in a minute divided by 2π radians per revolution.

3. Importance of Torque Calculation

Details: Torque calculation is essential for engine performance analysis, gearbox design, vehicle acceleration prediction, and mechanical system optimization. It helps engineers understand the rotational force available for work.

4. Using the Calculator

Tips: Enter horsepower in hp and rotational speed in RPM. 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: 5252 is derived from the conversion between horsepower and torque units. It comes from (550 ft-lb/sec per hp) × (60 sec/min) ÷ (2π rad/rev) = 5252.1.

Q2: What are typical torque values for different engines?
A: Small car engines: 100-200 lb-ft, performance cars: 200-500 lb-ft, diesel trucks: 500-1000+ lb-ft. Torque varies significantly by engine type and application.

Q3: How does torque relate to vehicle performance?
A: Torque determines acceleration and pulling power, while horsepower relates to top speed. Higher torque at lower RPM provides better low-end acceleration.

Q4: Can this formula be used for electric motors?
A: Yes, the formula applies to any rotating machinery including electric motors, though electric motors often have different torque curves than internal combustion engines.

Q5: What are the limitations of this calculation?
A: This provides theoretical maximum torque. Actual torque varies with engine efficiency, transmission losses, and operating conditions. It assumes constant power delivery.