How do you figure concrete for a circle?

Circular Slab Concrete Calculator

1. Area A = π * D² ÷ 4.
2. Perimeter P = π * D.
3. Volume V = π * D² ÷ 4 * (d ÷ 12)
4. Area.
5. Perimeter.
6. Volume.

How many cubic feet of cement do I need?

Multiple the length times the width, and multiply this product by the height measurement to find the total volume, or cubic feet, you need to fill with concrete. Assume a 10-by-10-foot square area with concrete 4 inches thick. When you multiply 10 by 10 by . 333 feet, you get 33.333 cubic feet.

How do you calculate concrete for a round hole?

Calculate Concrete Volume With the volume of the submerged post and the volume of the hole figured out, subtract the post volume from the hole volume, and you will have the volume of concrete needed for each hole. Simply multiply that amount times the number of posts to get a total quantity.

How do you find the cubic feet of a column?

Measure the length and width that you’d like to cover. Multiply the length by the width to determine square footage. Convert the thickness from inches to feet. Multiply the thickness in feet by the square footage to determine cubic feet.

How many cubic feet are in a circle?

The volume of a cylinder in cubic feet is equal to π times the radius in feet squared times the height in feet. π is roughly equal to 3.14159265359. If you know the diameter of the cylinder, you can find the radius by dividing the diameter by two, or just use our circle diameter calculator.

How do I calculate concrete for a cylinder?

Tip

1. Measure the diameter of the cylinder.
2. Use your calculator to divide the length of diameter by 2.
3. Measure the height of the cylinder in inches and record the result.
4. Multiply the length of the radius by itself.
5. Use the number 3.142 for the value of pi.
6. Multiply the result of step 5 by the height of the cylinder.

How many bags of concrete do I need for a 3 foot 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 many cubic feet are in a 4 foot circle?

Measuring in Feet 4 feet divided by 2 = 2 feet x 2 feet x 3.14 = 12.56 square feet x 8 feet = 100.48 cubic feet.

How many cubic yards of concrete do I need to pour?

You will need 37.7 * 0.037 = 1.4 cubic yards of concrete to pour this slab. This concrete calculator will help you in estimating the amount of concrete needed for your project. The amount given as needed does not include any waste.

How much concrete do I need to pour a circle slab?

Calculate the amount of concrete needed in cubic feet and cubic yards for a slab in the shape of a circle. To calculate the concrete volume needed for this type of slab, you need to know the circle’s diameter and the depth of this slab.. You will need 37.7 * 0.037 = 1.4 cubic yards of concrete to pour this slab.

How much concrete do I need to fill a round column?

They are 4 feet in height and 10 inches in width (diameter), or 4′ x 10″. Choose Round Column (or Round Slab) on the calculator. Enter Height 4 ft (or 48 in) Enter Diameter 10 in. Calculate and the answer is 0.08 cubic yards for one concrete tube. Multiply 0.08 x 50 = 4 total cubic yards of concrete for 50 tubes.

How much concrete do I need to fill a 10 inch tube?

Enter Diameter 10 in. Calculate and the answer is 0.08 cubic yards for one concrete tube. Multiply 0.08 x 50 = 4 total cubic yards of concrete for 50 tubes. Note that this calculation is the volume of your tubes only and does not account for any overflow or loss at the bottom of your tubes.