Home
Back
Torque Formula:
| From: | To: |
The torque formula calculates rotational force from horsepower and RPM. It's a fundamental equation in mechanical engineering that relates power, rotational speed, and torque output in engines and motors.
The calculator uses the torque formula:
Where:
Explanation: The constant 5252 comes from the relationship between horsepower, torque, and RPM, where 1 horsepower equals 550 foot-pounds per second and there are 60 seconds in a minute (550 × 60 ÷ 2π ≈ 5252).
Details: Torque calculation is essential for engine performance analysis, vehicle design, mechanical system optimization, and understanding the power characteristics of rotating machinery.
Tips: Enter horsepower in hp and 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 where 1 hp = 550 ft-lb/s and there are 60 seconds in a minute (550 × 60 ÷ 2π ≈ 5252).
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, while horsepower relates to top speed. Higher torque at lower RPM provides better low-end acceleration.
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 relationship between torque and power?
A: Power is the rate of doing work, while torque is the rotational force. Power = Torque × RPM ÷ 5252 (in hp and lb-ft units).