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Torque Formula:
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Torque is a measure of the rotational force applied to an object. In automotive and mechanical engineering, torque represents the twisting force that causes rotation, measured in pound-feet (lb-ft) or Newton-meters (N·m).
The calculator uses the torque formula:
Where:
Explanation: The constant 5252 comes from the relationship between horsepower, torque, and RPM, where 1 horsepower is defined as 550 foot-pounds per second and there are 5252 radians in a minute.
Details: Torque calculation is essential for engine performance analysis, transmission design, vehicle acceleration prediction, and mechanical system optimization. It helps engineers understand the twisting force available at different engine speeds.
Tips: Enter power in horsepower and RPM in revolutions per minute. Both values must be positive numbers. The calculator will compute the torque in pound-feet (lb-ft).
Q1: Why is 5252 used in the formula?
A: 5252 is a conversion constant derived from the definition of horsepower (550 ft-lb/sec) and the relationship between radians and revolutions (2π radians per revolution × 60 seconds per minute ≈ 5252).
Q2: What is the difference between torque and horsepower?
A: Torque measures rotational force, while horsepower measures the rate at which work is done. Horsepower = (Torque × RPM) / 5252.
Q3: At what RPM is torque and horsepower equal?
A: Torque and horsepower are numerically equal at 5252 RPM, as evident from the formula.
Q4: Can I use this formula for electric motors?
A: Yes, the formula works for any rotating machinery where power and rotational speed are known, including electric motors.
Q5: How does torque affect vehicle performance?
A: Higher torque at lower RPM provides better acceleration and towing capacity, while horsepower determines top speed and sustained performance.