1. What is Torque Calculation from HP and RPM?

Definition: This calculator determines the torque output based on horsepower and revolutions per minute (RPM).

Purpose: It helps engineers, mechanics, and automotive enthusiasts understand engine performance characteristics.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( T \) — Torque (pound-feet)
• \( HP \) — Horsepower
• \( RPM \) — Revolutions per minute
• 5252 — Conversion constant (derived from the relationship between rotational speed and power)

Explanation: The formula shows that torque and horsepower are directly related through RPM, with the constant 5252 representing the RPM at which torque and horsepower values are equal.

3. Importance of Torque Calculation

Details: Torque is a crucial measurement in engine performance, affecting acceleration, towing capacity, and overall vehicle dynamics.

4. Using the Calculator

Tips: Enter the horsepower value and engine RPM. Both values must be greater than zero for accurate calculations.

5. Frequently Asked Questions (FAQ)

Q1: Why is 5252 the magic number in the formula?
A: 5252 comes from the conversion between rotational speed (RPM) and angular velocity (radians per second), where 1 HP = 550 ft-lb/sec and there are 2π radians per revolution.

Q2: At what RPM are torque and horsepower equal?
A: At 5252 RPM, the torque and horsepower values will be numerically equal (though they have different units).

Q3: Does this formula work for electric motors?
A: Yes, the formula applies to any rotating machinery where you know the power and rotational speed.

Q4: How does torque relate to vehicle performance?
A: Higher torque at lower RPMs generally means better acceleration from a standstill and improved towing capability.

Q5: Can I calculate HP if I know torque and RPM?
A: Yes, you can rearrange the formula: \( HP = \frac{T \times RPM}{5252} \).