LEGO Technic Gear Ratios

This is a guide indicating how to Lego connect gears in a way that will work, without as much trial and error. Use these at your own risk, especially under high torque circumstances. The images were made useing Stud.io Special Note must be made to the diagonal combinations, they may wear down the gears quicker because of friction or slipping.

Check out Technic Brick Power's How to mesh any two LEGO gears on a regular grid video for an excellent chart. Also look at Sariel's interactive gear calculator website or app.

You can calculate spacing yourself using these equations:

  • (Teeth on gear 1 + Teeth on gear 2) / 2 / 8 = spacing in studs
  • (Teeth on gear 1 + Teeth on gear 2) / 2 / 3.2 = spacing in plates

2020-12-04 Updated for the 28 tooth gear. Ordered by ratio.

  • Normal Gears are in gray
  • Double Bevel Gears are in black
GearRatioImageNotes
8 - 40 1/5
0.2		 8 - 40
8 - 36 2/9
0.222		 8 - 36
8 - 28 2/7
0.286		 8 - 28
8 - 24 1/3
0.333		 8 - 24
12 - 36 1/3
0.333		 12 - 36
16 - 40 2/5
0.4		 16 - 40
12 - 28 3/7
0.429		 12 - 28
8 - 16 1/2
0.5		 8 - 16
12 - 24 1/2
0.5		 12 - 24
20 - 36 5/9
0.556		 20 - 36
16 - 28 4/7
0.571		 16 - 28
12 - 20 3/5
0.6		 12 - 20
24 - 40 3/5
0.6		 24 - 40
16 - 24 2/3
0.667		 16 - 24
16 - 24 2/3
0.667		 16 - 24 *
28 - 40 7/10
0.7		 28 - 40
20 - 28 5/7
0.714		 20 - 28
28 - 36 7/9
0.778		 28 - 36
16 - 20 4/5
0.8		 16 - 20
20 - 24 5/6
0.833		 20 - 24
8 - 8 1/1
1		 8 - 8
12 - 12 1/1
1		 12 - 12
16 - 16 1/1
1		 16 - 16
20 - 20 1/1
1		 20 - 20
24 - 24 1/1
1		 24 - 24
28 - 28 1/1
1		 28 - 28
36 - 36 1/1
1		 36 - 36
40 - 40 1/1
1		 40 - 40

* not as close at it could be

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