1. What is the Torque Formula?

The torque formula T = (HP × 5252) / RPM is a fundamental equation in mechanical engineering that relates horsepower, rotational speed (RPM), and torque output. The constant 5252 is derived from the relationship between foot-pounds, minutes, and horsepower.

2. How Does the Calculator Work?

The calculator uses the torque formula:

Where:

• \( T \) — Torque (lb-ft)
• \( HP \) — Horsepower
• \( RPM \) — Revolutions per minute

Explanation: This formula shows that for a given horsepower, torque decreases as RPM increases, and vice versa. The constant 5252 represents the RPM at which horsepower and torque values are equal.

3. Importance of Torque Calculation

Details: Torque calculation is essential for engine performance analysis, vehicle dynamics, mechanical design, and understanding the power characteristics of rotating machinery. It helps engineers optimize performance and efficiency in various applications.

4. Using the Calculator

Tips: Enter horsepower and RPM values. Both values must be positive numbers. The calculator will compute the corresponding torque in pound-feet (lb-ft).

5. Frequently Asked Questions (FAQ)

Q1: Why is 5252 used in the formula?
A: The number 5252 comes from the relationship between units of measurement: 1 horsepower equals 550 foot-pounds per second, and when converted to RPM, the constant becomes 5252.

Q2: What is the difference between horsepower and torque?
A: Torque is a measure of rotational force, while horsepower is a measure of work done over time. Horsepower equals torque multiplied by RPM divided by 5252.

Q3: At what RPM are horsepower and torque equal?
A: Horsepower and torque values are equal at 5252 RPM, due to the constant in the formula.

Q4: Can this formula be used for electric motors?
A: Yes, the formula applies to any rotating machinery, including electric motors, internal combustion engines, and turbines.

Q5: How does gear reduction affect torque?
A: Gear reduction increases torque while decreasing RPM, maintaining the same power output (minus efficiency losses).