This pulley ratio calculator helps you determine the ratio between the diameters of two pulleys.

## How to Use the Pulley Ratio Calculator

To calculate the driven pulley RPM and pulley ratio, please follow these steps:

- Enter the diameter of the driver pulley (D1) in the appropriate field.
- Enter the diameter of the driven pulley (D2) in the appropriate field.
- Enter the RPM of the driver pulley (N1) in the appropriate field.
- Optionally, enter the belt length if you have it. This field is informational and does not affect the calculation.
- Click the “Calculate” button to get the driven pulley RPM (N2) and the pulley ratio (D2/D1).

## How the Results are Calculated

The Pulley Ratio Calculator uses basic principles of pulley mechanics to calculate the desired values as follows:

**Pulley Ratio (D2/D1)**: The ratio of the diameter of the driven pulley to the diameter of the driver pulley.**Driven Pulley RPM (N2)**: The RPM of the driven pulley is calculated using the formula:*N2 = N1 / (D2 / D1)*. This means that the RPM of the driven pulley is inversely proportional to the ratio of the diameters of the driven and driver pulleys.

## Limitations

This calculator assumes that there is no slip or frictional losses in the belt drive system. It is ideal for theoretical calculations but may not account for real-world inefficiencies. Always consider additional factors such as belt tension, friction, and load when applying these calculations in practical scenarios.

## Use Cases for This Calculator

### Calculate Mechanical Advantage

Determine the mechanical advantage gained by using a pulley system with different pulley ratios. Simply input the number of movable pulleys and fixed pulleys to see how much weight you can lift with less force required.

### Plan Optimal Pulley Configuration

Experiment with various combinations of movable and fixed pulleys to find the most efficient setup for your lifting needs. Test different pulley ratios to achieve the desired balance between force and distance.

### Estimate Load Weight

Quickly estimate the weight of the load you can lift based on the pulley ratio you select. This helps you prepare for the amount of force needed to lift a particular object or load.

### Calculate Rope Tension

Determine the tension in the rope as you configure the pulley system. Understand how the rope tension changes with different pulley ratios to ensure safe and optimal operation of the system.

### Optimize Energy Efficiency

Fine-tune your pulley system to maximize energy efficiency by finding the right balance between input force and output force. Make informed decisions on pulley ratios to reduce energy wastage.

### Explore Different Pulley Systems

Experiment with various pulley systems, from simple setups with one movable pulley to complex systems with multiple pulleys. Gain insights into how different configurations affect the overall mechanical advantage.

### Understand Force Distribution

Visualize how the force is distributed across the pulley system based on the pulley ratio. Use this information to better understand the mechanical principles behind pulley systems.

### Compare Efficiency of Pulley Systems

Compare the efficiency of different pulley systems by inputting various pulley ratios and observing the resulting mechanical advantage. Determine which configuration best suits your lifting requirements.

### Optimal Use of Pulley Systems

Learn how to make the most of pulley systems by calculating the ideal pulley ratio for your specific lifting tasks. Enhance your knowledge of mechanical advantage and apply it to practical scenarios.

### Effortless Pulley System Planning

Simplify the process of planning pulley systems by using a calculator to quickly determine the optimal pulley ratio. Save time and effort in designing efficient lifting mechanisms for various applications.