Gear Ratio Calculator
Calculate mechanical advantage from gear teeth
About this calculator
A gear ratio calculator determines the mechanical advantage between two gears by comparing their tooth counts. This tool helps engineers, mechanics, and hobbyists calculate speed reduction or increase, torque multiplication, and rotational relationships in gear systems. Understanding gear ratios is essential for designing transmissions, robotics, machinery, and any mechanical system requiring precise speed and torque control. The calculator instantly provides the ratio, helping optimize performance and efficiency in mechanical applications.
How to use
Enter the number of teeth on the driving gear (input gear) and the driven gear (output gear). The calculator will automatically compute the gear ratio by dividing the driven gear teeth by the driving gear teeth. The result shows how many times the input gear must rotate for one complete rotation of the output gear.
Frequently asked questions
What does a gear ratio of 3:1 mean?
A 3:1 ratio means the input gear rotates three times for every one rotation of the output gear, providing torque multiplication but speed reduction.
How do I calculate gear ratio manually?
Divide the number of teeth on the driven gear by the number of teeth on the driving gear: Gear Ratio = Driven Teeth ÷ Driving Teeth.
What's the difference between speed increase and reduction ratios?
Ratios greater than 1:1 provide speed reduction and torque increase. Ratios less than 1:1 provide speed increase and torque reduction.