One popular formula for making concrete is the "1-2-3": 1 part portland, 2 parts sand, 3 parts gravel. A 94# bag of portland (approximately 1 cubic foot) would yield 6 cubic feet of concrete. 3 cubic yards of concrete x 27 (cubic feet per yard) = 81 cubic feet; 81 / 6 (cubic feet of concrete per bag) = 13.5 bags of portland.
This Formula
1 cubic yards of concrete=
One popular formula for making concrete is the "1-2-3": 1 part portland, 2 parts sand, 3 parts gravel. A 94# bag of portland (approximately 1 cubic foot) would yield 6 cubic feet of concrete. 1cubic yards of concrete x 27 (cubic feet per yard)
27 cubic feet; 27 / 6 (cubic feet of concrete per bag) = 4.5 bags of portland cement
Mucca suggested:
this mixture would be fine for setting fence posts, but not for pouring a foundation. concrete mix is often measured in "sacks", that is number of sacks per cubic yard. The number of sacks of portland cement per cubic yard determines the strength of the finished product.
For casual use 1-2-3 works fine. if you were pouring a driveway you might consider how much stress will be applied, the thickness of the slab, even how cold it gets in winter to determine the mix.
I called a concrete supplier today to find out how much ten yards of concrete would cost to have delivered. He asked what mix I would need. I told him I wanted a slab for a garage. He suggested a six yard mix, that is six 94 lb sacks of portland cement per cubic yard. (he quoted ($99 a yard plus $4 per mile from the plant in November 2010 in northern Nevada)
So for more than casual use you need to do some research to find the proper mixture. Work with someone with experience or do a lot of digging, or both.
Portland Cement Association at cement.org is one place to start
Depends on what strenth you want (PSI) 5 sack would be about 2800-3000PSI (Footer mix) 6 sack would be 3300 - 3700 PSI (exterior sidewalk or driveway mix)
4 bags
Forty five 80 pound bags of cement are needed to make one cubic yard of concrete.
25
One cubic meter of concrete is equal to 1.308 cubic yards of concrete. If there are 5 1/2 bags of cement in 1 cubic yard of concrete, there would be 7.2 bags in 1 cubic meter of concrete. These are the 94 pound bags of portland cement or roughly 40kg bags so figure 8 bags total. Some will be left over
4 bags of 50 kg each= 200 kg of cement.
7 cement bags per 1 cubic meter of concrete......
11 bags
7 bags cement
A 15' x 20' x 4" slab needs at least 3.7 cubic yards.
typically one pallet, i believe theres 42 80lb bags on a pallet.
The answer will depend on the size of the cement bags! The answer will depend on the size of the cement bags! The answer will depend on the size of the cement bags! The answer will depend on the size of the cement bags!
Depending on the use of the concrete, between 5-6 bags.
It would depend on how big the bag of cement is. 1 foot bags will be more in the cubic meter than 2 feet.