1. What is a Torque and RPM to Watts Calculator?

Definition: This calculator converts torque (in pound-feet) and rotational speed (RPM) to power output in watts.

Purpose: It helps engineers and mechanics determine the power output of rotating machinery like engines, motors, and turbines.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( P_w \) — Power (watts)
• \( T \) — Torque (pound-feet)
• \( RPM \) — Rotational speed (revolutions per minute)
• \( 2\pi \) — Conversion factor for radians per revolution
• \( 60 \) — Conversion factor for seconds per minute

Explanation: The formula calculates the power by multiplying torque by angular velocity (converted from RPM to radians per second).

3. Importance of Power Calculation

Details: Accurate power calculations are essential for designing mechanical systems, selecting appropriate motors, and evaluating performance.

4. Using the Calculator

Tips: Enter the torque in pound-feet and rotational speed in RPM. Both values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: How do I convert the result to horsepower?
A: Divide the watts result by 745.7 to get horsepower (1 HP = 745.7 watts).

Q2: What if my torque is in Newton-meters?
A: First convert Nm to lb-ft (1 Nm = 0.7376 lb-ft) or use a different formula that works directly with SI units.

Q3: Does this work for both motors and engines?
A: Yes, the formula applies to any rotating machinery where torque and RPM are known.

Q4: Why is 2π in the formula?
A: This converts revolutions to radians (1 revolution = 2π radians) for proper angular velocity calculation.

Q5: What's a typical torque value for an electric motor?
A: Small motors might have 1-5 lb-ft, while industrial motors can have hundreds of lb-ft torque.