400 in * 1yd/36in = 11.111 yards (11 1/9 yards)
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400
There are 3 feet in one yard. Therefore, 400 yards is equal to 400 x 3 = 1200 feet.
There are 0.9144 metres in one yard. Therefore, 400 yards is equal to 400 x 0.9144 = 365.76 metres.
There are 91.44 centimetres in one yard. Therefore, rounded to two decimal places, 400 centimetres is equal to 400/91.44 = 4.37 yards.
At a poured depth of 4 inches, you will need 4.94 cubic yards.