Gear Ratio Calculator

Frequently Asked Questions

What is a gear ratio?

The gear ratio represents the relationship between the input (driver) gear and the output (driven) gear.

It determines how torque and speed are transferred between gears.
A **higher ratio** increases torque but reduces speed.
A **lower ratio** increases speed but reduces torque.

How do I calculate gear ratio?

Use the formula:

**Gear Ratio** = (Number of teeth on driven gear) / (Number of teeth on driver gear)
Example: If the driver gear has **10 teeth** and the driven gear has **50 teeth**, the gear ratio is **5:1**.

What happens when I change the gear ratio?

Gear ratios affect both speed and torque:

A **higher gear ratio (e.g., 5:1)** increases torque but decreases speed.
A **lower gear ratio (e.g., 1:3)** increases speed but reduces torque.

How does gear ratio affect RPM?

The output RPM is calculated as:

**Output RPM** = (Input RPM) / (Gear Ratio)
If an engine runs at **2000 RPM** and the gear ratio is **2:1**, the output RPM is **1000 RPM**.

How does gear ratio affect torque?

The output torque is calculated as:

**Output Torque** = (Input Torque) × (Gear Ratio)
If an engine produces **100 Nm** torque and the gear ratio is **3:1**, the output torque is **300 Nm**.