Want to pour concrete But don't know how much cement, sand and stone to order, load it! Calculate the amount of cement, sand and stone required to mix concrete according to the standard formula: coarse concrete with ratio 1: 3: 5, general standard concrete with ratio 1: 2: 4 and concrete according to the Department of Public Works standards (concrete C.1, C. .2, C. 3, C. 4)