# How Much Concrete For Post Holes?

## How many bags of concrete do I need for a 6×6 post hole?

5cf), then buy enough bags of concrete for that amount. Buy a couple extra bags, if you don’t use them you can always return them. As I recall, a 60# bag of concrete is about. 5cf, so you’d need 3 bags per hole.

## How do you calculate concrete for a round hole?

They are 4 feet in height and 10 inches in width (diameter), or 4′ x 10″.

1. Choose Round Column (or Round Slab) on the calculator.
2. Enter Height 4 ft (or 48 in)
3. Enter Diameter 10 in.
4. Calculate and the answer is 0.08 cubic yards for one concrete tube.
5. Multiply 0.08 x 50 = 4 total cubic yards of concrete for 50 tubes.
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## How much quikrete does it take to fill a hole?

Fill the hole with Fast-Setting Concrete up to 3 to 4 inches below ground level. Pour about a gallon of water per 50 lb bag into the hole and allow the water to saturate the concrete mix. Wait about 4 hours to begin constructing your fence or applying heavy weight to your post.

## How much quikrete do I need for a mailbox post?

Most mailbox posts will need 2 bags of Quikrete to set, but before starting use this calculator to determine how many bags you need!

## How do I keep my post level while concrete dries?

Fill the hole up to a depth of 8 inches from ground level with 1/2-inch drainage gravel. Use rough-cut gravel with sharp edges. It will hold the post better than smooth rock.

## Can you put dry concrete in a post hole?

Fast-setting concrete is ideal for setting posts because there’s no mixing— you simply pour the dry concrete from the bag right into the hole, then add water. Under normal curing conditions, you can apply heavy weight to the post (a basketball backboard, for example) after just 4 hours.

## How many 20kg bags of premixed concrete do you need?

For jobs where a stronger rated concrete is needed, youmay consider our High Strength Concrete Mix for your concreting purposes. Yield: One 20kg bag will cover an area of 1.1m2 to a depth of approximately 10mm. Or 108 x 20kg bags equates to one cubic metre of mixed concrete.

## How many bags of concrete do I need for a 10×20 slab?

A 60-pound bag yields. 017 cubic yards, and an 80-pound bag yields. 022 cubic yards. For a 10 x 10 slab, you would need 77 60-pound bags or 60 80-pound bags.

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## How many 60 pound bags of concrete make a yard?

If you’re using 60lb bags of concrete, you’ll need 60 bags to make a yard. If you’re using 80lb bags of concrete, you’ll need 45 bags to make a yard.

## How big of a hole do I need for a 6×6 post?

A 6×6 post requires a 10″-diameter hole. Shovel a 6″ layer of gravel into the hole to provide drainage.

## How many square feet does a 80lb bag of quikrete cover?

4 sq feet in that amount of cement.

## How much does an 80lb bag of concrete cover?

bag provides 0.45 cubic feet of cured concrete. A 80 lb. bag provides 0.6 cubic feet of cured concrete. If you have concrete delivered it is sold by the yard (which is a cubic yard = 27 cubic feet).

## How many bags of concrete do I need for a mailbox post?

Pour the dry concrete straight into the hole leaving 3 to 4 inches of space from the top of the hole. In most cases a 50-pound bag of quick-dry concrete should suffice.

## How many bags of concrete do I need for a 4×4 post?

Mix two 50lb bags of concrete with water in a mixing tub or 5-gallon bucket. Add concrete into the hole and around the 4” x 4”. Depending on your climate, let concrete set up for 24 – 48 hours.

## Is quikrete as strong as regular concrete?

Quikrete fast setting concrete is just as strong as regular concrete. Concrete gets its strength from a chemical reaction that occurs over time during curing. After it’s had time to cure, which usually take 28 days to complete, Quikrete can reach strengths up to 5000 psi.