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Torque Formula:
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Torque is a measure of rotational force that causes an object to rotate about an axis. In automotive and mechanical applications, torque represents the twisting force produced by an engine or motor, measured in pound-feet (lb-ft) or Newton-meters (Nm).
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 60 seconds in a minute and 2π radians in one revolution.
Details: Torque calculation is essential for understanding engine performance, vehicle acceleration, towing capacity, and mechanical system design. It helps engineers and mechanics optimize power delivery and select appropriate components.
Tips: Enter horsepower and RPM values. Both values must be positive numbers. The calculator will compute the torque in pound-feet (lb-ft).
Q1: Why is 5252 the constant in the formula?
A: 5252 is derived from the definition of horsepower (1 HP = 550 ft-lb/s) and the conversion between minutes and seconds (60 seconds/minute) and radians (2π radians/revolution).
Q2: What's the difference between horsepower and torque?
A: Torque is rotational force, while horsepower is the rate at which work is done. Horsepower = (Torque × RPM) / 5252.
Q3: At what RPM is horsepower equal to torque?
A: Horsepower and torque values are equal at 5252 RPM, which is why this number appears in the formula.
Q4: Can I use this formula for electric motors?
A: Yes, the formula works for any rotating machinery where horsepower and RPM are known, including electric motors.
Q5: What are typical torque values for different engines?
A: Passenger cars typically produce 100-400 lb-ft, trucks 400-1000+ lb-ft, and industrial engines can produce several thousand lb-ft of torque.