Belt Ratio Calculator


Calculating belt ratios is essential in various engineering applications, particularly in machinery design and optimization. Whether you’re working on conveyor systems, power transmission, or any other belt-driven mechanism, understanding the belt ratio is crucial for efficient operation.

How to Use:

To utilize this belt ratio calculator, simply input the values of the pulley diameters. The calculator will then determine the ratio between the driver and driven pulleys, aiding in the precise configuration of your belt-driven system.


The formula for calculating belt ratio (R) is:

Where D driver​ represents the diameter of the driver pulley and D driven​ represents the diameter of the driven pulley.

Example Solve:

Let’s consider a scenario where the driver pulley diameter is 10 inches and the driven pulley diameter is 5 inches.

Using the formula, we can calculate the belt ratio:

This indicates that for every revolution of the driver pulley, the driven pulley will make two revolutions.


Q: What are the applications of belt ratio calculations?

A: Belt ratio calculations are crucial in designing various belt-driven systems, including conveyor belts, power transmission systems, and HVAC units.

Q: How does belt ratio affect mechanical systems?

A: Belt ratio determines the speed and torque transmission between pulleys, affecting the overall performance and efficiency of the system.

Q: Can this calculator handle different units of measurement?

A: Yes, as long as the units for both pulley diameters are consistent, this calculator can handle various measurement units such as inches, centimeters, or millimeters.


In conclusion, the belt ratio calculator simplifies the process of determining the relationship between pulley diameters in belt-driven systems. By accurately calculating the belt ratio, engineers and designers can optimize the performance and efficiency of their machinery.

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