i want to know if there are no ACI Charts avaiable for getting the values of "row" or As ( area of steel ) then is there any direct formula for finding this if we have the Moment Mu or Ku avaiable in case of footing design. I have a formula but i want to confirm it with you guys please help me out :-

row = 1/m ( 1- under-root 1-ku/F) , here m = fy/0.85f'c and F= 0.3825f'c. is it correct to use this or is there any other formula for finding the area of steel and then spacing of the bars in case of foundation design