FAQ: How Much Concrete To Fill A 12 Sonotube?

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 much concrete do I need calculator?

For concrete, the formula for volume is as follows: length x width x thickness. 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.

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.

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 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.

How many cubic meters is a 25kg bag of concrete?

Concrete is a mix, typically of 1 part cement to 4-5 aggregate, and a cubic metre of finished concrete weighs around 2.5 tonnes, so requires around 500kg cement or 20× 25kg bags. In direct answer, there is about 1/100th or 0.01 m3 in a 25kg bag.

How much does 2 yards of concrete cost?

According to the NRMCA – Ready Mixed Concrete Industry Data Survey, the average cost of concrete in 2018 was $120 per cubic yard, or $240 for the 2 cubic yards needed for a typical 10-by-10-foot patio.



Bulk Concrete Prices.

Cubic Yards Price Range
1* $140-$200
2* $280-$400
3* $420-$600
4* $560-$800

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.

How much concrete do I need for a 10 sonotube?

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

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.

Is 2 feet deep enough for fence posts?

Project Instructions



The depth of the hole should be 1/3-1/2 the post height above ground (i.e., a 6-foot tall fence would require a hole depth of at least 2 feet).

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Do you need gravel under concrete?

Whether you pour concrete for a walkway or patio, a strong gravel base is required to prevent the concrete from cracking and shifting. Gravel is especially important in clay soil because it doesn’t drain well, which results in water pooling under the concrete slab and slowly eroding the soil as it finally drains.

Do fence posts need concrete?

Concrete is the most secure material for setting fence posts, especially if you have sandy soil. Gravel may be okay with dense, clay-heavy soil, but in looser soil, concrete is the only thing that will truly keep your fence posts stuck in place.

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