HP to Torque Equation

Torque Formula:

\[ T = \frac{HP \times 5252}{RPM} \]

Torque (lb-ft):

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1. What is the HP to Torque Equation?

Definition: This calculator converts horsepower (HP) to torque (lb-ft) using engine speed (RPM).

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

2. How Does the Calculator Work?

The calculator uses the formula:

\[ T = \frac{HP \times 5252}{RPM} \]

Where:

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

Explanation: Torque and horsepower are related through RPM. At 5252 RPM, torque and horsepower values are equal.

3. Importance of Torque Calculation

Details: Torque measures rotational force and is crucial for understanding an engine's pulling power and acceleration characteristics.

4. Using the Calculator

Tips: Enter the horsepower value and engine speed in RPM. Both values must be greater than 0.

5. Frequently Asked Questions (FAQ)

Q1: Why is 5252 the magic number in the equation?
A: It comes from the conversion between rotational speed and power (1 HP = 550 ft-lb/sec, and there are 60 seconds in a minute).

Q2: What's the difference between torque and horsepower?
A: Torque measures rotational force, while horsepower measures the rate at which work is done (torque × RPM).

Q3: At what RPM are torque and horsepower equal?
A: At 5252 RPM, torque and horsepower values will be numerically equal (though they have different units).

Q4: Can I use this for electric motors?
A: Yes, the same formula applies to any rotating machinery, including electric motors.

Q5: How does torque relate to vehicle performance?
A: Higher torque at lower RPMs generally means better acceleration from a stop, while high-RPM horsepower affects top speed.