Home
Back
Torque Formula:
| From: | To: |
The torque formula calculates rotational force from horsepower and RPM. It's a fundamental equation in mechanical engineering and automotive applications that relates power output to rotational speed.
The calculator uses the torque formula:
Where:
Explanation: The constant 5252 comes from the fact that one horsepower is defined as 550 foot-pounds per second, and there are 2π radians in one revolution.
Details: Torque calculation is essential for engine performance analysis, gearbox design, vehicle dynamics, and understanding the relationship between power and rotational force in mechanical systems.
Tips: Enter horsepower in hp and RPM in rotations per minute. All values must be valid (HP > 0, RPM > 0).
Q1: Why is 5252 the constant in the formula?
A: 5252 is derived from the conversion between horsepower (550 ft-lb/sec) and RPM (revolutions per minute), accounting for the relationship between rotational speed and linear force.
Q2: What are typical torque values for engines?
A: Torque values vary widely by engine type. Small car engines might produce 100-200 lb-ft, while diesel truck engines can produce 800-1000+ lb-ft of torque.
Q3: How does torque relate to vehicle performance?
A: Torque determines a vehicle's acceleration and pulling power, while horsepower relates to top speed. Higher torque at lower RPMs generally means better low-end acceleration.
Q4: Can this formula be used for electric motors?
A: Yes, the formula works for any rotational power system, though electric motors often have different torque characteristics than internal combustion engines.
Q5: What's the difference between lb-ft and Nm torque measurements?
A: lb-ft (pound-feet) is the imperial unit, while Nm (Newton-meters) is the metric unit. 1 lb-ft equals approximately 1.3558 Nm.