Pulley Ratio Calculator RPM

Pulley Ratio Formula:

\[ \text{Ratio} = \frac{\text{RPM}_1}{\text{RPM}_2} \]

Pulley Ratio (unitless):

Definition: This calculator determines the pulley ratio based on the input and output rotational speeds (RPM) of a pulley system.

Purpose: It helps mechanical engineers, technicians, and DIY enthusiasts design and analyze belt-driven systems.

The calculator uses the formula:

\[ \text{Ratio} = \frac{\text{RPM}_1}{\text{RPM}_2} \]

Where:

Explanation: The ratio represents how many times the input pulley rotates compared to the output pulley.

Details: Proper pulley ratio calculation ensures correct speed transmission, torque conversion, and system efficiency in belt-driven machinery.

Tips: Enter both input and output RPM values. All values must be > 0. The result shows the speed ratio between the pulleys.

Q1: What does a ratio greater than 1 mean?
A: A ratio > 1 indicates the input pulley rotates faster than the output pulley (speed reduction).

Q2: What does a ratio less than 1 mean?
A: A ratio < 1 indicates the output pulley rotates faster than the input pulley (speed increase).

Q3: How does this relate to pulley diameters?
A: The RPM ratio is inversely proportional to the diameter ratio (Ratio = D₂/D₁).

Q4: Can I use this for gear ratios?
A: Yes, the same principle applies to gear systems where RPM₁ is the driver gear.

Q5: What's a typical pulley ratio range?
A: Common ratios range from 1:10 (0.1) to 10:1 (10), depending on application requirements.