What Is the Gear Ratio Calculator?
A gear ratio calculator describes how a pair of gears changes speed and torque.
How Does the Gear Ratio Calculator Work?
It divides the driven tooth count by the driver count, then divides input speed by that ratio.
Gear Ratio Calculator Formula & Variables
The core mathematical equation utilized by this calculator is expressed as:
The gear ratio is the driven tooth count divided by the driver tooth count; output speed is input speed divided by the ratio.
How to Use the Gear Ratio Calculator
- Enter the teeth on each gear and the input speed.
Step-by-Step Example Calculation
20-tooth driving 40-tooth
Input Values:
driverTeeth:20
drivenTeeth:40
inputRpm:1000
Worked Steps: A 2:1 ratio gives 500 rpm and doubles torque.
Understanding Your Result
The result is the gear ratio, output rpm and torque multiplier.
Factors That Affect the Result
- The tooth counts and input speed determine everything.
When Should You Use This Calculator?
- Use it for gearboxes, bicycles, clocks and any gear train.
Assumptions & Limitations
- Ignores friction and efficiency losses, which are usually a few percent.
Frequently Asked Questions
Calculation Accuracy & Reference Note
This calculator implements verified, deterministic mathematical equations based on published standards. Results should be treated as professional engineering estimates; always verify critical operations with local equipment manuals and site inspections.