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The following symbols are used to denote square inches: sq inches, sq inch, sq in inches/-2, inch/-2, in/-2 inches^2, inch^2, in^2 inches², inch², in².To translate the square meters to cubic meters, you need to know the thickness or height of those objects or areas for which the amount is converted. A square inch (plural: square inches) is a unit of area, equal to the area of a square with sides of one inch. Area measurement converter is also available.Square inch (in² - British/American), area. Use the tools to calculate and measure the square foot, square yard, or square inch volume of any given area, based on total width and length.

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Try our free land (area) measurement conversion calculator. This 12' x 12' footing needs to be calculated 12' x 16' so the footing is figured to go above grade to reach the 4' slab thickness.Land Conversion Calculator. House slabs on grade that are 8' out of grade with a 4' slab also have some of the footing above the grade too. Then use the calculator to figure the amount of concrete needed. So it is important to check a variety of spots on your footing and get an average size. The excavator may have dug too deep, or it may have rained and footings needed to be dug out deeper to reach firm soil. This was supposed to be a 12'*12' footing, but note how the left side of the footing has collapsed.

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In rocky soil the footings may collapse when big rocks are excavated Calculating the amount of concrete needed for footingsįootings will rarely follow the drawing exactly. Through the center the width averages 14'. Here is why: The driveway is 16' at the top and 12' at the bottom. Odd shapes: Transform odd shapes into rectangles and odd shapes are suddenly easy to figure.įigure driveway 14' x 20' and your estimate will be good. If you check your grade and one spot is 4', some spots are 4.5' to 5'-the best solution for both the job quality and your concrete budget is to fix the grade. This assumes you have the job evenly graded to the right depth, and the grade is well compacted. Rule of thumb: add 1/ 4' to the thickness of your slab for your slab concrete budget. CONCRETE ESTIMATING TIPSĪtlanta Brick & Concrete in Atlanta, GA Calculating the amount of concrete needed for slabs (including odd shapes) If your project requires more concrete, multiple trucks will be necessary. The average truck holds between 9 and 11 yards total. Many ready mix companies will have a minimum order of 1 yard, and will charge shortage fees when ordering partial batches. If you’re planning to order concrete from a ready mix supplier, they’ll need to know how many yards of concrete to deliver.

Large patios, driveways, pool decks and more.

Ready mixed concrete by the yard is good for: A rented mixer can be very helpful, but a wheelbarrow works for just a few bags. You’ll also need additional equipment for mixing the concrete. If you’re purchasing bagged concrete you may be able to have it delivered, but if it is only a few bags you’ll be responsible for transporting it yourself.

Footings for decks, pergolas, walls and more.

Making repairs to foundation walls, walkways or steps.

Pouring small slabs for sidewalks or patios.

For smaller jobs, like a walkway, modest patio or footings, you should calculate the number of concrete bags instead. Larger jobs such as driveways are easier to complete when ordering concrete by the yard, rather than trying to mix bag after bag by hand. BAGGED CONCRETE Should I order concrete by the yard from a ready mix company or just use bags? Use the following yields per each bag size: To determine how many bags of concrete you will need, divide the total cubic yards needed by the yield. For concrete, the formula for volume is as follows: length x width x thickness. Here’s what the math looks like for a 10’ by 10’ concrete patio:Įssentially you are solving for volume and then converting to cubic yards.

Convert cubic feet to cubic yards by multiplying by.

Multiply the thickness in feet by the square footage to determine cubic feet.

Convert the thickness from inches to feet.

Multiply the length by the width to determine square footage.

Measure the length and width that you’d like to cover.

Determine how thick you want the concrete.

CONCRETE CALCULATOR FORMULA What equation should I use to find out how much concrete I need?

Online math calculator with steps how to#

Learn how to correctly calculate how much concrete mix you will need for your job. Knowing how much concrete is needed for a job is incredibly important.

Use this free concrete calculator to determine how much concrete you need.