Gear Ratio Calculator
Calculate gear ratios, mechanical advantage, and output speed for gear systems
About this calculator
The Gear Ratio Calculator helps engineers, mechanics, and hobbyists determine the relationship between input and output gears in mechanical systems. By calculating gear ratios, mechanical advantage, and output speeds, this tool enables precise design of transmissions, motors, bicycles, and industrial machinery. Understanding gear ratios is essential for optimizing torque multiplication, speed reduction or increase, and overall system efficiency in any gear-driven application.
How to use
Enter the number of teeth on your input (driving) gear and output (driven) gear into the calculator. The tool will automatically compute the gear ratio, mechanical advantage, and output speed based on your input speed. Use these results to analyze your gear system's performance and make design adjustments as needed.
Frequently asked questions
What is gear ratio and why does it matter?
Gear ratio is the relationship between input and output gear teeth, determining speed and torque changes in mechanical systems.
How do I calculate mechanical advantage?
Mechanical advantage equals the gear ratio - higher ratios provide more torque multiplication but reduce output speed.
What's the difference between gear reduction and overdrive?
Gear reduction (ratio >1) increases torque and reduces speed, while overdrive (ratio <1) increases speed and reduces torque.