I'll use the density of dry, packed sand, which is 100 lbs per cubic foot, 50/100 is 2 50 lb bags of sand
A 50lb bag of Pea gravel will cover about half a cubic foot.
.3375 CF per 50 lb bag
.5
0.5 is one-half, it takes 2 of these to make one cubic foot.
100 cubic foot bags.
Each 60 pounds bag of ready mix concrete will make .45 cubic foot of concrete. There are 27 cubic feet in a cubic yard. You will need 60 bags of 60 pound premixed concrete to make 1 cubic yard.
16/0.75 = 21.33...
1 cubic yard = 27 cubic feet = 54 half-cubic-foot bags
4.5 "six square foot" bags equal a cubic yard (27 cubic feet) of volume capacity.
You need10.8/(the number of cubic feet of sand in each bag) bags.
about 60 60lb bags
13.5 bags are required.
0.02832 cubic meters per cubic foot.
It would depend on how big the bag of cement is. 1 foot bags will be more in the cubic meter than 2 feet.
Your patio is (8x8)/6in = 10.66 cubic foot. The sand comes in 50 lb bags that cover 0.5 cubic foot so you will need 21.33 bags (round up to 22 or down to 21)