The amount of concrete needed to fill a Sonotube depends on the diameter and height of Sonotube. Typically a 12-inch Sonotube requires 0.029 cubic yards or 0.785 cubic feet or either 2×60 lb or 1.5 x 80 lb bags of concrete to fill it one foot height.

The common size of Sonotubes are 6″, 8″, 10″, 12″, 16″ & 18″ in diameter and a 4 foot in length. Its dimensions are 8″×4′ tube, 10″×4′ tube, 12″×4′ tube, 6″×4′ tube, 16″×4′ tube and 18″×4′ tube.

Sonotubes are biodegradable cardboard tubes in which concrete is poured to form solid concrete pillars. The word Sonotube is a trademarked brand name. Other companies like Sakrete and Quikrete make their own version of a Tube. Sakrete’s tube is called a Form-tube while the Quikrete’s tube is called a Quik-tube. So, the words like Sonotube, Form-tube, and Quik-tube are similar things.

Sonotube (Form-tube, or Quik-tube) are light weight, biodegradable, single use form used for variety of concrete column application such as fence posts, concrete column, deck pilings, goal posts, mailboxes or lamp, footing use below grade and up to 3 feet above grade. They are made from engineered of multiple layers of high quality fibers laminating material which is resistance to moisture.

A premix sack of concrete weighs approximately 80-pound bag, 60-pound bag, 50-pound bag, 40-pound bag, or in a few area 90-pound bag. To determine how many bags of premixed concrete you will need, divide the total cubic yards or cubic feet needed by the yields.

**Use the following yields per each bag size in cubic yards or in cubic feet:**

- A 60 pound bag yields 0.017 cubic yards (since, 60/3600 = 0.017 yards) or 0.45 cubic feet (since, 60/133 = 0.45 cubic feet)
- A 80 pound bag yields 0.022 cubic yards (since, 80/3600 = 0.022 yards) or 0.6 cubic feet (since, 80/133 = 0.60 cubic feet)

The volume of concrete required to fill a Sonotube is equal to volume of cylindrical shape Sonotube. To calculate the volume of each Sonotube, you can use the formula for the volume of a cylinder: V = πr²h, where r is the radius and h is the height.

**To figure out how much concrete you’d need to fill a Sonotube, here’s concrete calculation steps:-**

- Calculate the volume of a Sonotube in cubic feet: V = πr²h, where r is the radius and h is the height.
- Convert cubic feet to cubic Yards: Multiply your measurement in cubic feet by 0.037 to estimate the volume of concrete in cubic yards.
- Convert cubic feet to bags of concrete: Divide the amount of concrete needed in cubic feet by yields per bag.

**How many bags of concrete to fill a 6″, 8″, 10″, 12″, 16″, 14″ & 18″ Sonotube**

In general, at a 4 foot height, you’ll need about 1.3 × 80 lb bags of concrete for a 6-inch Sonotube, 2.33 × 80 lb bags for an 8-inch Sonotube, 3.63 × 80 lb bags for a 10-inch Sonotube, 5.23 × 80 lb bags for a 12-inch Sonotube, 7.12 × 80 lb bags for a 14-inch Sonotube, 9.3 × 80 lb bags for a 16-inch Sonotube, and 11.78 × 80 lb bags of concrete for a 18-inch Sonotube.

**How much concrete do i need for a 6-inch Sonotube**

Here’s are quantity of concrete needed to fill a 6-inch Sonotube for one foot (12 inches) height:-

- Estimate Cubic inches of concrete: for a 6″ Sonotube: V = π * (6/2)^2 * h = 3.14 × 3×3 × 12 = 339.12 cubic inches
- Estimate Cubic feet of concrete: Divide the 339.12 cubic inches by 1728, such as 339.12/ 1728 = 0.196 cubic feet
- Estimate Cubic yards of concrete: Divide the 0.196 cubic feet by 27, such as 0.196/27 = 0.0073 cubic yards
- Estimate 80 lb bags of concrete: Divide the 0.196 cubic feet by 0.60, such as 0.196/0.60 = 0.33 80 lb bags of concrete
- Estimate 60 lb bags of concrete: Divide the 0.196 cubic feet by 0.45, such as 0.196/0.45 = 0.44 60 lb bags of concrete.

Typically a 6-inch Sonotube requires 0.0073 cubic yards or 0.196 cubic feet or either 0.33 x 80 lb or 0.44 x 60 lb bags of concrete to fill it one foot height.

**6″ Sonotube concrete calculator at 4 feet (48 inches) height are following:-**

- Estimate Cubic inches of concrete: for a 6″ Sonotube: V = π * (6/2)^2 * h = 3.14 × 3×3 × 48 = 1356.48 cubic inches
- Estimate Cubic feet of concrete: Divide the 1356.48 cubic inches by 1728, such as 1356.48/ 1728 = 0.785 cubic feet
- Estimate Cubic yards of concrete: Divide the 0.785 cubic feet by 27, such as 0.785/27 = 0.029 cubic yards
- Estimate 80 lb bags of concrete: Divide the 0.785 cubic feet by 0.60, such as 0.785/0.60 = 1.33 80 lb bags of concrete
- Estimate 60 lb bags of concrete: Divide the 0.785 cubic feet by 0.45, such as 0.785/0.45 = 1.74 60 lb bags of concrete.

The number of concrete bags needed to fill a 6-inch diameter sonotube depends on height of the tube and the yields per bag of concrete. For a 4-foot (48 inches) tall sonotube with a diameter of 6 inches, you would need approximately 1.3 x 80 lb or 1.74 x 60 lb bags of concrete.

**How much concrete do i need for an 8-inch Sonotube**

Here’s are quantity of concrete needed to fill an 8-inch Sonotube for one foot (12 inches) height:-

- Estimate Cubic inches of concrete: for a 8″ Sonotube: V = π * (8/2)^2 * h = 3.14 × 4×4 × 12 = 602.88 cubic inches
- Estimate Cubic feet of concrete: Divide the 602.88 cubic inches by 1728, such as 602.88/ 1728 = 0.349 cubic feet
- Estimate Cubic yards of concrete: Divide the 0.349 cubic feet by 27, such as 0.349/27 = 0.0129 cubic yards
- Estimate 80 lb bags of concrete: Divide the 0.349 cubic feet by 0.60, such as 0.349/0.60 = 0.58 80 lb bags of concrete
- Estimate 60 lb bags of concrete: Divide the 0.349 cubic feet by 0.45, such as 0.349/0.45 = 0.78 60 lb bags of concrete.

Typically an 8-inch Sonotube requires 0.0129 cubic yards or 0.349 cubic feet or either 0.58 x 80 lb or 0.78 x 60 lb bags of concrete to fill it one foot height.

**8″ Sonotube concrete calculator at 4 feet (48 inches) height are following:-**

- Estimate Cubic inches of concrete: for an 8″ Sonotube: V = π * (8/2)^2 * h = 3.14 × 4×4 × 48 = 2411.52 cubic inches
- Estimate Cubic feet of concrete: Divide the 2411.52 cubic inches by 1728, such as 2411.52/ 1728 = 1.395 cubic feet
- Estimate Cubic yards of concrete: Divide the 1.395 cubic feet by 27, such as 1.395/27 = 0.052 cubic yards
- Estimate 80 lb bags of concrete: Divide the 1.395 cubic feet by 0.60, such as 1.395/0.60 = 2.33 80 lb bags of concrete
- Estimate 60 lb bags of concrete: Divide the 1.395 cubic feet by 0.45, such as 1.395/0.45 = 3.1 60 lb bags of concrete.

The number of concrete bags needed to fill an 8-inch diameter sonotube depends on height of the tube and the yields per bag of concrete. For a 4-foot (48 inches) tall sonotube with a diameter of 8 inches, you would need approximately 2.33 x 80 lb or 3.1 x 60 lb bags of concrete.

**How much concrete do i need for a 10-inch Sonotube**

Here’s are quantity of concrete needed to fill a 10-inch Sonotube for one foot (12 inches) height:-

- Estimate Cubic inches of concrete: for a 10″ Sonotube: V = π * (10/2)^2 * h = 3.14 × 5×5 × 12 = 942 cubic inches
- Estimate Cubic feet of concrete: Divide the 942 cubic inches by 1728, such as 942/ 1728 = 0.545 cubic feet
- Estimate Cubic yards of concrete: Divide the 0.545 cubic feet by 27, such as 0.545/27 = 0.02 cubic yards
- Estimate 80 lb bags of concrete: Divide the 0.545 cubic feet by 0.60, such as 0.545/0.60 = 0.90 80 lb bags of concrete
- Estimate 60 lb bags of concrete: Divide the 0.545 cubic feet by 0.45, such as 0.545/0.45 = 1.21 60 lb bags of concrete.

Typically a 10-inch Sonotube requires 0.02 cubic yards or 0.545 cubic feet or either 0.90 x 80 lb or 1.21 x 60 lb bags of concrete to fill it one foot height.

**10″ Sonotube concrete calculator at 4 feet (48 inches) height are following:-**

- Estimate Cubic inches of concrete: for a 10″ Sonotube: V = π * (10/2)^2 * h = 3.14 × 5×5 × 48 = 3768 cubic inches
- Estimate Cubic feet of concrete: Divide the 3768 cubic inches by 1728, such as 3768/ 1728 = 2.18 cubic feet
- Estimate Cubic yards of concrete: Divide the 2.18 cubic feet by 27, such as 2.18/27 = 0.08 cubic yards
- Estimate 80 lb bags of concrete: Divide the 2.18 cubic feet by 0.60, such as 2.18/0.60 = 3.63 80 lb bags of concrete
- Estimate 60 lb bags of concrete: Divide the 2.18 cubic feet by 0.45, such as 2.18/0.45 = 4.85 60 lb bags of concrete.

The number of concrete bags needed to fill a 10-inch diameter sonotube depends on height of the tube and the yields per bag of concrete. For a 4-foot (48 inches) tall sonotube with a diameter of 10 inches, you would need approximately 3.63 x 80 lb or 4.85 x 60 lb bags of concrete.

**How much concrete do i need for a 12-inch Sonotube**

Here’s are quantity of concrete needed to fill a 12-inch Sonotube for one foot (12 inches) height:-

- Estimate Cubic inches of concrete: for a 12″ Sonotube: V = π * (12/2)^2 * h = 3.14 × 6×6 × 12 = 1356.48 cubic inches
- Estimate Cubic feet of concrete: Divide the 1356.48 cubic inches by 1728, such as 1356.48/ 1728 = 0.785 cubic feet
- Estimate Cubic yards of concrete: Divide the 0.785 cubic feet by 27, such as 0.785/27 = 0.029 cubic yards
- Estimate 80 lb bags of concrete: Divide the 0.785 cubic feet by 0.60, such as 0.785/0.60 = 1.3 80 lb bags of concrete
- Estimate 60 lb bags of concrete: Divide the 0.785 cubic feet by 0.45, such as 0.785/0.45 = 1.74 60 lb bags of concrete.

Typically a 12-inch Sonotube requires 0.029 cubic yards or 0.785 cubic feet or either 1.3 x 80 lb or 1.74 x 60 lb bags of concrete to fill it one foot height.

**12″ Sonotube concrete calculator at 4 feet (48 inches) height are following:-**

- Estimate Cubic inches of concrete: for a 12″ Sonotube: V = π * (12/2)^2 * h = 3.14 × 6×6 × 48 = 5425.92 cubic inches
- Estimate Cubic feet of concrete: Divide the 5425.92 cubic inches by 1728, such as 5425.92/ 1728 = 3.14 cubic feet
- Estimate Cubic yards of concrete: Divide the 3.14 cubic feet by 27, such as 3.14/27 = 0.116 cubic yards
- Estimate 80 lb bags of concrete: Divide the 3.14 cubic feet by 0.60, such as 3.14/0.60 = 5.23 80 lb bags of concrete
- Estimate 60 lb bags of concrete: Divide the 3.14 cubic feet by 0.45, such as 3.14/0.45 = 6.97 60 lb bags of concrete.

The number of concrete bags needed to fill a 12-inch diameter sonotube depends on height of the tube and the yields per bag of concrete. For a 4-foot (48 inches) tall sonotube with a diameter of 12 inches, you would need approximately 5.23 x 80 lb or 6.97 x 60 lb bags of concrete.

**How much concrete do i need for a 14-inch Sonotube**

Here’s are quantity of concrete needed to fill a 14-inch Sonotube for one foot (12 inches) height:-

- Estimate Cubic inches of concrete: for a 14″ Sonotube: V = π * (14/2)^2 * h = 3.14 × 7×7 × 12 = 1846.32 cubic inches
- Estimate Cubic feet of concrete: Divide the 1846.32 cubic inches by 1728, such as 1846.32/ 1728 = 1.068 cubic feet
- Estimate Cubic yards of concrete: Divide the 1.068 cubic feet by 27, such as 1.068/27 = 0.0395 cubic yards
- Estimate 80 lb bags of concrete: Divide the 1.068 cubic feet by 0.60, such as 1.068/0.60 = 1.78 80 lb bags of concrete
- Estimate 60 lb bags of concrete: Divide the 1.068 cubic feet by 0.45, such as 1.068/0.45 = 2.37 60 lb bags of concrete.

Typically a 14-inch Sonotube requires 0.0395 cubic yards or 1.068 cubic feet or either 1.78 x 80 lb or 2.37 x 60 lb bags of concrete to fill it one foot height.

**14″ Sonotube concrete calculator at 4 feet (48 inches) height are following:-**

- Estimate Cubic inches of concrete: for a 14″ Sonotube: V = π * (14/2)^2 * h = 3.14 × 7×7 × 48 = 7385.28 cubic inches
- Estimate Cubic feet of concrete: Divide the 7385.28 cubic inches by 1728, such as 7385.28/ 1728 = 4.27 cubic feet
- Estimate Cubic yards of concrete: Divide the 4.27 cubic feet by 27, such as 4.27/27 = 0.158 cubic yards
- Estimate 80 lb bags of concrete: Divide the 4.27 cubic feet by 0.60, such as 4.27/0.60 = 7.12 80 lb bags of concrete
- Estimate 60 lb bags of concrete: Divide the 4.27 cubic feet by 0.45, such as 4.27/0.45 = 9.49 60 lb bags of concrete.

The number of concrete bags needed to fill a 14-inch diameter sonotube depends on height of the tube and the yields per bag of concrete. For a 4-foot (48 inches) tall sonotube with a diameter of 14 inches, you would need approximately 7.12 x 80 lb or 9.49 x 60 lb bags of concrete.

**How much concrete do i need for a 16-inch Sonotube**

Here’s are quantity of concrete needed to fill a 16-inch Sonotube for one foot (12 inches) height:-

- Estimate Cubic inches of concrete: for a 16″ Sonotube: V = π * (16/2)^2 * h = 3.14 × 8×8 × 12 = 2411.52 cubic inches
- Estimate Cubic feet of concrete: Divide the 2411.52 cubic inches by 1728, such as 2411.52/ 1728 = 1.4 cubic feet
- Estimate Cubic yards of concrete: Divide the 1.4 cubic feet by 27, such as 1.4/27 = 0.052 cubic yards
- Estimate 80 lb bags of concrete: Divide the 1.4 cubic feet by 0.60, such as 1.4/0.60 = 2.32 80 lb bags of concrete
- Estimate 60 lb bags of concrete: Divide the 1.4 cubic feet by 0.45, such as 1.4/0.45 = 3.1 60 lb bags of concrete.

Typically a 16-inch Sonotube requires 0.052 cubic yards or 1.4 cubic feet or either 2.32 x 80 lb or 3.1 x 60 lb bags of concrete to fill it one foot height.

**16″ Sonotube concrete calculator at 4 feet (48 inches) height are following:-**

- Estimate Cubic inches of concrete: for a 16″ Sonotube: V = π * (16/2)^2 * h = 3.14 × 8×8 × 48 = 7385.28 cubic inches
- Estimate Cubic feet of concrete: Divide the 9646 cubic inches by 1728, such as 9646/ 1728 = 5.28 cubic feet
- Estimate Cubic yards of concrete: Divide the 5.28 cubic feet by 27, such as 5.28/27 = 0.21 cubic yards
- Estimate 80 lb bags of concrete: Divide the 5.28 cubic feet by 0.60, such as 5.28/0.60 = 9.3 80 lb bags of concrete
- Estimate 60 lb bags of concrete: Divide the 5.28 cubic feet by 0.45, such as 5.28/0.45 = 12 60 lb bags of concrete.

The number of concrete bags needed to fill a 16-inch diameter sonotube depends on height of the tube and the yields per bag of concrete. For a 4-foot (48 inches) tall sonotube with a diameter of 16 inches, you would need approximately 9.3 x 80 lb or 12 x 60 lb bags of concrete.

**How much concrete do i need for a 18-inch Sonotube**

Here’s are quantity of concrete needed to fill a 18-inch Sonotube for one foot (12 inches) height:-

- Estimate Cubic inches of concrete: for a 18″ Sonotube: V = π * (18/2)^2 * h = 3.14 × 9×9 × 12 = 3052 cubic inches
- Estimate Cubic feet of concrete: Divide the 3052 cubic inches by 1728, such as 3052/ 1728 = 1.76 cubic feet
- Estimate Cubic yards of concrete: Divide the 1.76 cubic feet by 27, such as 1.76/27 = 0.065 cubic yards
- Estimate 80 lb bags of concrete: Divide the 1.76 cubic feet by 0.60, such as 1.76/0.60 = 2.94 80 lb bags of concrete
- Estimate 60 lb bags of concrete: Divide the 1.76 cubic feet by 0.45, such as 1.76/0.45 = 3.93 60 lb bags of concrete.

Typically a 18-inch Sonotube requires 0.065 cubic yards or 1.76 cubic feet or either 2.94 x 80 lb or 3.93 x 60 lb bags of concrete to fill it one foot height.

**18″ Sonotube concrete calculator at 4 feet (48 inches) height are following:-**

- Estimate Cubic inches of concrete: for a 18″ Sonotube: V = π * (18/2)^2 * h = 3.14 × 9×9 × 48 = 12208 cubic inches
- Estimate Cubic feet of concrete: Divide the 12208 cubic inches by 1728, such as 12208/ 1728 = 7.1 cubic feet
- Estimate Cubic yards of concrete: Divide the 7.1 cubic feet by 27, such as 7.1/27 = 0.26 cubic yards
- Estimate 80 lb bags of concrete: Divide the 7.1 cubic feet by 0.60, such as 7.1/0.60 = 11.78 80 lb bags of concrete
- Estimate 60 lb bags of concrete: Divide the 7.1 cubic feet by 0.45, such as 7.1/0.45 = 15.7 60 lb bags of concrete.

The number of concrete bags needed to fill a 18-inch diameter sonotube depends on height of the tube and the yields per bag of concrete. For a 4-foot (48 inches) tall sonotube with a diameter of 18 inches, you would need approximately 11.78 x 80 lb or 15.7 x 60 lb bags of concrete.