X1 gear ratio?

I want to figure out my gear ratio. I have a 36 tooth on the back, a 12 tooth on the front, but that's not the part I wonder about. What is the ratio in the transmission? I know there is a reduction in there, but what is it?

I think it 3 to 1. Which means the motor spins 3 times to the front sprocket spinning once.

spin the clutch drum.........and count how many turns it takes for the output shaft to make one complete revolution.