How do you convert sq inches into feet?

You cannot convert 'sq'ins' to 'ft'. because.

'Sq.ins.'' is a measure of AREA , and 'inches' is a measure of LENGTH.

However, You can convert 'sq.ins' to 'sq'ft'.

Remember

12 inches = 1 foot (Linear)

12ins. X 12 ins. = 144 sq. ins = 1 sq.ft. (Area)

12ins. X 12 ins. X 12 ins = 1728 cu.ins = 1 cu.ft. (Volume).

So to convert 'sq'ins' to 'sq'ft' you divide by '144'

Vice Versa to convert 'sq'ft' to 'sq'ins' you multiply by '144'.

So to convert 'cu.in/cu.ft' you do the same as above , except you use '1728'.