How to calculate the bend of an arc?

Question

Adobe Illustrator

Hello!

Available - design of a rectangular sticker (150x30mm)
It is necessary to extrude the rectangular picture of the sticker so that after gluing to the wall of the can there is no deformation. A jar with a different radius of the bottom and neck, that is, a truncated cone.

Question - how to calculate the percentage of bending for the Warp tool (arc style), knowing the lower and upper radii?
Perhaps there is some design life hack?

Thanks!