Determine the drain current (PMOS-transistor)
$$\  I_{D} = \frac{\textrm{Kp}}{2}(V_{GS}-V_T)^2 $$
$$\   I_D =\frac{\textrm{2.3}}{2}((-2.22V)-(1.8V))^2 = 0.203 \textrm{m} A = 203 \mu A  $$

Found this :
https://vlsitips.blogspot.com/2012/06/vlsi-physical-design.html