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Torque Formula:
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The HP Torque RPM Formula calculates torque from horsepower and rotational speed. This fundamental mechanical engineering equation is widely used in automotive, industrial, and mechanical applications to determine the twisting force produced by an engine or motor.
The calculator uses the torque formula:
Where:
Explanation: The constant 5252 comes from the relationship between horsepower, torque, and rotational speed, where 1 horsepower equals 550 foot-pounds per second and there are 60 seconds in a minute.
Details: Torque calculation is essential for engine performance analysis, gearbox design, vehicle acceleration prediction, and mechanical system optimization. It helps engineers understand the actual force available for work.
Tips: Enter horsepower in HP units, RPM in revolutions per minute. Both values must be positive numbers greater than zero for accurate calculation.
Q1: Why is the constant 5252 used in the formula?
A: The constant 5252 comes from unit conversions: 1 HP = 550 ft-lb/sec and 1 minute = 60 seconds, so 550 × 60 ÷ 2π ≈ 5252.
Q2: What is the relationship between torque and horsepower?
A: Horsepower is a measure of work done over time, while torque is the rotational force. Horsepower = (Torque × RPM) ÷ 5252.
Q3: Can this formula be used for electric motors?
A: Yes, the formula applies to any rotating machinery including electric motors, internal combustion engines, and turbines.
Q4: What are typical torque values for automotive engines?
A: Typical passenger car engines produce 100-400 lb-ft of torque, while heavy-duty diesel engines can produce over 1000 lb-ft.
Q5: How does torque affect vehicle performance?
A: Higher torque provides better acceleration and towing capacity, while horsepower determines top speed and overall performance capability.