how much cement in 1m3 of concrete . How much ballast and cement do I need for 1m3 concrete. quantity of cement for 1m3 concrete: cement quantity = 1/6 1m3 = 0166m3, we know weight of cement = volume density, so weight of cement in kg = 0166m3 1500kg/m3 = 249kg, if weight of cement bag is 25kg, then number of bags of 25kg cement as 249/25 = …