Power and Torque Calculator by Tons of Concrete

Power and Torque Formula:

\[ P_w = \frac{T \times RPM \times 2\pi}{60} \]

Power (Watts):

Power (Horsepower):

Unit Converter ▲

Unit Converter ▼

From:	To:

1. What is the Power and Torque Calculator?

Definition: This calculator determines mechanical power output based on torque and rotational speed.

Purpose: It helps engineers, mechanics, and technicians analyze engine and motor performance.

2. How Does the Calculator Work?

The calculator uses the formula:

\[ P_w = \frac{T \times RPM \times 2\pi}{60} \]

Where:

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

Explanation: The formula calculates the instantaneous power being produced by multiplying torque by angular velocity.

3. Importance of Power and Torque Calculation

Details: Understanding the relationship between power and torque is essential for engine design, vehicle performance analysis, and mechanical system optimization.

4. Using the Calculator

Tips: Enter the torque value in lb-ft and rotational speed in RPM. Both values must be > 0.

5. Frequently Asked Questions (FAQ)

Q1: What's the difference between power and torque?
A: Torque is a rotational force, while power is the rate at which work is done (torque × angular velocity).

Q2: Why are there two power outputs?
A: The calculator shows both watts (SI unit) and horsepower (common mechanical unit) for convenience.

Q3: Can I use this for electric motors?
A: Yes, the formula applies to any rotating system, including electric motors.

Q4: How accurate is this calculation?
A: It provides theoretical maximum power; real-world systems have efficiency losses.

Q5: What if I have Nm instead of lb-ft?
A: Multiply Nm by 0.7376 to convert to lb-ft before using this calculator.