Pulley Speed Calculator
Calculate output speed in pulley systems
About this calculator
The Pulley Speed Calculator determines the output speed of driven pulleys in mechanical systems based on input speed and pulley diameter ratios. This tool is essential for engineers, mechanics, and students working with belt-driven systems, conveyor belts, or any machinery requiring precise speed calculations. Understanding pulley speed relationships helps optimize machine performance, ensure proper torque transmission, and maintain equipment efficiency in industrial applications.
How to use
Enter the input pulley speed (RPM), input pulley diameter, and output pulley diameter into the calculator. The tool will automatically calculate the output speed using the inverse relationship between pulley sizes and speeds. Larger pulleys rotate slower while smaller pulleys rotate faster for the same belt speed.
Frequently asked questions
How does pulley size affect output speed?
Smaller output pulleys increase speed while larger output pulleys decrease speed. The speed ratio is inversely proportional to the diameter ratio.
What units can I use for pulley diameters?
Any consistent units work (inches, centimeters, millimeters) since the calculation uses ratios. Just ensure both diameters use the same units.
Does belt slip affect the calculated speed?
The calculator assumes no belt slip. In real applications, consider 1-3% slip depending on belt type and tension conditions.