Volume calculator cubic feet12/28/2022 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. 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) Ask your supplier if you'd like to know the exact weight. So if you need three yards, that would be around 12,000 lbs (3yds x 4,000lbs). However, most ready mix suppliers estimate that a cubic yard of concrete weighs about 4,000 lbs. How much does concrete weigh?Ĭoncrete is usually ordered in cubic yards, but if you're looking for concrete weight it varies depending on the type of mix being used. 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.
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