How do i calculate the Delta V from surface to the minimun orbit possible

[Askert]

Guys, i was trying to learn things about ksp and i dont know how do i calculate the delta V necessary to make a orbit from surface, i tried to substitute the formulas already knowed and i've got nothing productive. As i know that exist a image telling about the delta v costs, i just want to know how to calculate it and try my self with math. im new, sorry.

[MKellerBR]