# FAQ: 12 Inch Sonotube How Much Concrete?

## How many bags of concrete does it take to fill a sonotube?

16 cubic feet / 0.6 cubic feet / per bag = 27 (80#) bags of concrete mix.

## How many bags of concrete do I need calculator?

To determine how many bags of concrete you will need, divide the total cubic yards needed by the yield. Use the following yields per each bag size: 40 pound bag yields.011 cubic yards. 60 pound bag yields.017 cubic yards.

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

The formula for the volume of a round hole is pi r2 x depth. Or 3.14 x radius x radius x depth. The radius is half the width of the hole.

## 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.

You might be interested:  Quick Answer: How Much Does A Concrete Slab Cost Per Square Foot?

## How much concrete do I need for 10 sonotube?

For example, a sono tube with a 10” diameter and a 4′ depth requires 0.08 cubic yards of 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.

## How many 20kg bags of concrete are in a cubic meter?

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 much does a 25kg bag of concrete cover?

As a rule of thumb 1 of our 25kg bags will cover an area of 0.25m to a recommended depth of 50mm.

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

As I recall, a 60# bag of concrete is about. 5cf, so you’d need 3 bags per hole.

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

Most fence post holes will need between 1 – 4 bags of concrete to securely hold the post in place. The best way to determine the size of the hole is: Diameter of the hole is 3 times the width of the fence post. Depth of the hole is one-third to half the above ground height of the fence post.

## How much concrete do I need for a post hole?

Remember, the depth of the post hole should be one-half of the above-ground post height. (Example: For a 6 feet above ground post, use a post with an overall height of 9 feet and place 3 feet in the ground). The calculator will indicate the number of 50 lb. bags of QUIKRETE® Fast-Setting Concrete you need.

You might be interested:  Question: How Long To Leave Acid Stain On Concrete?

## How many 80lb bags of concrete makes a yard?

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

## Do you leave sonotube in ground?

No, it’s not a problem to leave the Sonotube and its plastic “Square Foot” (like these) in the ground forever.

## What size sonotube for a 4×4 post?

What size Sonotube do I need for a 4×4fence post? The rule-of-thumb is to use a tube diameter 3 times the post width, therefore use a 12” diameter Sonotube for a 4×4post.