Home
Back
Torque Formula:
| From: | To: |
Torque calculation from horsepower and RPM is a fundamental mechanical engineering formula that determines the rotational force produced by an engine or motor. It's essential for understanding engine performance and power delivery characteristics.
The calculator uses the torque formula:
Where:
Explanation: The constant 5252 comes from the fact that 1 horsepower is defined as 550 foot-pounds per second, and there are 60 seconds in a minute, so 550 × 60 ÷ 2π ≈ 5252.
Details: Accurate torque calculation is crucial for engine design, performance analysis, vehicle dynamics, and mechanical system optimization. It helps engineers understand power delivery characteristics and efficiency.
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 used in the formula?
A: 5252 is a conversion constant derived from the definition of horsepower (550 ft-lb/s) and the relationship between rotational speed and linear motion.
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 large diesel engines can produce over 1000 lb-ft of torque.
Q3: How does torque relate to vehicle performance?
A: Torque determines acceleration and pulling power. Higher torque at lower RPM generally means better low-speed performance and towing capability.
Q4: Can this formula be used for electric motors?
A: Yes, the formula works for any rotating machinery, including electric motors, but note that electric motors often have different torque characteristics than combustion engines.
Q5: What's the difference between torque and horsepower?
A: Torque is a measure of rotational force, while horsepower is a measure of work done over time. Horsepower = (Torque × RPM) ÷ 5252.