Webquarts to cubic feet conversion formula. [x] cu ft = 0. 033420138888889 × [y] qt. Where [x] is the result in cu ft and [y] is the amount of qt we want to convert. Webin order to convert from [qt] to [ft3], we have to devide the amount of quarts by 29. 92206. Then the second step, is to substitute the amount of quarts with the value of 40 and. Web35 rows40 quarts is equal to about 1. 34 cubic feet. Web40 quarts equals 1. 33681 cubic foot. To convert any value in quarts to cubic feet, just multiply the value in quarts by the conversion factor 0. 033420138888889. Web1 qt = 0. 033420138888875 ft3. To convert 40 quarts into cubic feet we have to multiply 40 by the conversion factor in order to get the volume amount from quarts to cubic feet.