**Answer**

To construct a 10" diameter by 4' depth sono tube, for example, 0.08 cubic yards of concrete is required.

### As a result, how much concrete do I need to fill a 2x2x2 hole in the ground?

Each hole measures 2'x2'x2', which equates to 8 cubic feet of space. Because you have two of them, you will need 16 cubic feet of concrete. An 80 lb (36.3 kg) bag of Quikrete produces roughly 0.60 cu ft of finished product (17 L). 16 cubic feet / 0.6 cubic feet / every bag = 27 (80#) bags of concrete mix (cubic feet divided by cubic feet per bag).

### As a result, the issue is: how do you determine the amount of concrete needed for a circular hole?

**To calculate the number of cubic metres required to fill a circular hole**

EXAMPLE: How much concrete is required to fill five holes that are 1200mm deep and 1050mm in diameter?

ANSWER: One hole requires 1.039 cubic metres, so five holes equals 5 x 1.039 = 5.195 cubic metres. (for example, 5.2 cubic metres)

NOTE: When the diameter of a hole is doubled, four times the amount of concrete is required.

### How much concrete is in a post hole may be determined in this manner.

In relation to: When installing a post, the typical rule of thumb is that the depth of the post's hole should be 1/3 to 1/2 the actual above-ground height of the post. With the size of the hole you'll need decided, use the table below to figure out how many 50-pound bags of concrete you'll need to fill the hole.

### What is the formula for calculating concrete piers?

The volume of concrete may be calculated using the following formula: length x breadth x thickness. To figure out how many bags of concrete you'll need, divide the total cubic yards required by the yield of the concrete mix. For each bag size, use the yields shown below to calculate your results: The output from a 40-pound bag is.011 cubic yards.

### There were 39 related questions and answers found.

### In order to build a 4x4 post, how many bags of concrete do I need?

Another thing to consider is that 1-1/2 bags per hole is approximately perfect for a 4x4 fence post. Also, keep in mind that the depth of the post hole should be one-half the height of the above-ground posts. Example: To create an above-ground post that is 6 feet tall, use a 9-foot-tall post with a 3-foot-deep foundation.

### 2 feet deep is sufficient for fence posts, do you think?

It is recommended that you drill your fence post holes for panel pieces to a depth of at least 2 feet deep. A typical rule of thumb is to dig holes that are one-third to one-half the height of the post above ground. The deeper you dig the holes, the more stable your fence will be; however, you will need to buy longer posts to do this.

### How large of a hole do I need for a 4x4 post?

Use a motorised auger, a manual auger, or a post-hole digger to dig an 8-inch-diameter hole that is at least 6 inches deeper below your area's frost line for each 4x4 post. A hole with a diameter of 10" is required for a 6x6 post. Fill the hole with a 6-inch layer of gravel to serve as a drainage layer.

### A yard of concrete is equal to how many 80lb bags of concrete are used?

How many 80-pound bags of concrete do I need to fill a yard of space? An 80-pound bag of Sacrete or Quikrete (pre-mixed cement, sand, and gravel) has a completed volume of 0.6 cubic foot when it is combined (stated on the bag). In a cubic yard, there are 27 cubic feet of space. The number of bags required may be calculated by dividing 27 cubic feet by the volume of the bag in question.

### How many square feet does a bag of concrete weighing 80 pounds cover?

The concrete mix provides 30 cubic feet and 60 pounds of concrete. A 45-cubic-foot space and an 80-pound bag provide results. 60 cubic feet of space.

### When it comes to fence posts, what is the finest concrete mix to use?

In terms of the ideal mix to utilise for concrete fence posts, a 1:2:4 ratio is the most effective (1 cement, 2 sand, 4 aggregate). Concrete is always best mixed using a cement mixer to ensure that it is level, although hand mixing is acceptable if you just need to mix a little amount of concrete (see mixing concrete project above for tips on how to do this).

### What is the formula for calculating concrete post holes?

For volume calculations, use the formulae listed above. Calculate the total volume of the post. Change the diameter of the post to feet: 3.5" divided by 12 equals 0.2917' Calculate the radius (120% of the diameter) as follows: Calculate the volume of the hole. Hole radius (three times the post radius): three times 0.1458' = 0.4374' Calculate the volume of concrete. The volume of the hole minus the volume of the post is 0.3826 – 0.1336 = 0.2490 cubic feet.

### What is the proper way to backfill a fence post?

As you backfill the hole around your new post with a mixture of crushed gravel and dirt, be sure to compress the soil every 4-6 inches or so as you go. Dig a hole to a depth that is adequate for the height of the post and fill it with dirt. Place a pre-cast concrete biscuit at the desired location (block). Fill up the hole with earth once you've placed your post in it.

### How do you put in a 4x4 post on concrete that is level?

To install lead shields, drill holes in the concrete using a masonry bit attached to a hammer drill that are the proper diameter. Lead shields should be inserted into the holes in the concrete. Lag bolts or screws are used to secure the metal post bracket to the concrete foundation. Insert the wood post into the post bracket and secure it in place using screws or nails.

### When digging a 12 foot post, how deep should it go into the ground?

As a rule of thumb, holes for posts that reach 8 feet or more above ground level should be at least 3 feet deep in general. Hole depths of at least 2 1/2 feet should be drilled in posts that reach 6 feet above the ground level.

### Is it necessary to install fence posts in concrete?

Concrete is the most stable material for installing fence posts, particularly if you have sandy soil on which to build the fence. Gravel may work well in tight, clay-rich soil, but in looser soil, concrete is the only item that can properly hold your fence posts in place and prevent them from moving about.

### I'm wondering how long it takes for the concrete to set in a post hole.

Due to the rapid setting time of the concrete (which is especially useful when installing fence posts), you may immediately move on to the next step of the project or backfill the hole to complete it in a short amount of time. Under typical curing circumstances, you may attach substantial weight to the post (such as a basketball backboard) within just 4 hours, depending on the curing conditions.

### What is the proper depth for a 6x6 post in the ground?

If you live in a rural region, your local building regulations should indicate the required depth for post holes. Plan on around two feet in depth for a building that is eight feet tall, such as this one. The depth of the hole should be about one-fourth the height of the post you are using. To accommodate a 6x6 post, the diameter of the holes should be about 12 inches square in size.

### What is the recommended depth for burying gate posts?

Dig a hole at least 2ft 6 (760mm) deep and as deep as possible (3ft (915mm) to bring the base of the post below the level where frost may penetrate; once below this level, the earth is less likely to shift as much!