Tools:
Gear Ratio Calculator Model Scaler Thumbnail Helper Wheels Chart Unit Converter
Calculator
Click the images to select the respective gears. Start with the first pair and add more pairs as needed:
8
12
12
14
16
16
16
20
20
20
24
24
24
16
24
28
28
36
40
28
56
56
60
168
1
1
8
12
12
14
16
16
16
20
20
20
24
24
24
16
24
28
28
36
40
28
56
56
60
168


Select your drive motor to see the theoretical output speed in RPM (Rotations Per Minute):
Ratio calculator for planetary gears
Assuming that the red gear is the input, the gray beam is the output and that the yellow gear is not rotating (e.g. fixed to a motor):
specify numbers of teeth for red and yellow gear below, then click calculate.

Red gear: teeth | Yellow gear: teeth

Gear coupler
The red dot marks the position of your driver gear's axle. Select the position of your follower gear's axle to see the available gear combinations:

Units: liftarms     bricks