1. What is the Torque Formula?

The torque formula calculates rotational force from horsepower and RPM. It provides a fundamental relationship between power, rotational speed, and torque in mechanical systems.

2. How Does the Calculator Work?

The calculator uses the torque formula:

Where:

• \( Torque \) — Rotational force (lb-ft)
• \( HP \) — Horsepower (hp)
• \( 5252 \) — Conversion constant
• \( RPM \) — Rotational speed (rev/min)

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

3. Importance of Torque Calculation

Details: Accurate torque calculation is crucial for engine performance analysis, mechanical design, automotive engineering, and understanding power transmission systems.

4. Using the Calculator

Tips: Enter horsepower in hp and RPM in revolutions per minute. All values must be valid (HP > 0, RPM > 0). The calculator will compute torque in pound-feet (lb-ft).

5. Frequently Asked Questions (FAQ)

Q1: Why is the constant 5252 used?
A: 5252 is derived from the conversion between horsepower and torque, where 1 hp = 550 ft-lb/sec and there are 5252 radians per minute at 1 RPM.

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 1000 lb-ft.

Q3: How does torque relate to vehicle performance?
A: Torque determines acceleration and pulling power, while horsepower determines 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 the power rating may need conversion if given in kilowatts.

Q5: What is the difference between lb-ft and Nm?
A: lb-ft (pound-feet) is the imperial unit of torque, while Nm (Newton-meters) is the metric unit. 1 lb-ft = 1.35582 Nm.