Dimensions of stress are :

[$ML^2T^{-2}$] [$ML^0T^{-2}$] [$ML^{-1}T^{-2}$] [$MLT^{-2}$]

[$ML^{-1}T^{-2}$]

Stress = $\frac{Force}{Area}$ = $\frac{[MLT^{-2}]}{[L^2]}] = [ML^{-1}T^{-2}]$