1. What is the Torque Formula?

The torque formula calculates rotational force from power and rotational speed. In imperial units, it provides torque in pound-feet (lb-ft) based on horsepower (hp) and revolutions per minute (RPM).

2. How Does the Calculator Work?

The calculator uses the torque formula:

Where:

• \( T \) — Torque (lb-ft)
• \( P \) — Power (hp)
• \( RPM \) — Rotational speed (rev/min)
• \( 5252 \) — Conversion constant

Explanation: The constant 5252 comes from the relationship between horsepower, torque, and RPM, where 1 horsepower equals 550 foot-pounds per second.

3. Importance of Torque Calculation

Details: Torque calculation is essential for engine performance analysis, mechanical design, automotive engineering, and understanding the relationship between power output and rotational force in mechanical systems.

4. Using the Calculator

Tips: Enter power in horsepower (hp) and rotational speed in revolutions per minute (RPM). All values must be positive numbers greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: Why is the constant 5252 used?
A: The constant 5252 comes from the conversion between horsepower and foot-pounds per minute, where 1 hp = 33,000 ft-lb/min and 5252 = 33,000 ÷ (2π).

Q2: What are typical torque values for engines?
A: Typical passenger car engines produce 100-400 lb-ft of torque, while heavy-duty diesel engines can produce over 1,000 lb-ft.

Q3: How does torque relate to vehicle performance?
A: Higher torque at lower RPM provides better acceleration and towing capacity, while high-RPM torque affects top speed and high-end performance.

Q4: Can this formula be used for electric motors?
A: Yes, the formula applies to any rotational mechanical system, including electric motors, when using consistent imperial units.

Q5: What's the difference between torque and power?
A: Torque is rotational force, while power is the rate at which work is done. Power = Torque × RPM ÷ 5252 in imperial units.