Here is a concrete cubic yard calculator for cylinders, sono-tubes, walls, sidewalks and floors. Just enter in your dimensions, make sure you choose feet and inches carefully, then hit calculate. An estimated cubic yardage will show in the box. Use these calculators for estimating purposes, there's a formula below to calculate concrete for cylinders if you want to check the calculator. You can also use my concrete flatwork formula to double check results for slabs and floors.
Flat Work Concrete Calculator
Wall Concrete Calculator
I always check the actual thickness with a laser level. If you don't have one you can rent one, it will come in handy when you set the finished grade to your concrete floor, walls or sono-tubes. Checking instead of assuming what the actual thickness is will save you from running short on concrete.
Depending on the size of your project, it's always a good idea to add a little extra, 5% to 10%. When I order concrete, I always order 1/2 to 1 yard extra, over the years I've learned running out of concrete isn't good for me, the customer or the concrete company.
Instead of using a concrete calculator to figure your cubic yardage, you can do the math yourself with this formula:
pi X r^2 X h - This will give you the volume in cubic inches which we'll convert to cubic feet then to cubic yards.
pi = 3.14
r^2 = radius squared or radius x radius (radius is 1/2 the diameter)
h = height in inches
Here's an example:
If you have a concrete sono-tube that's 12 inches in diameter and 5 feet deep, here's what the math will look like.
3.14 x (6in. x 6in.) x h
3.14 x 36 x 60 = 6783 cubic inches (rounded up)
To convert the cubic inches to cubic feet divide your result by 1728. 6783/1728 = 3.93 cubic feet. You can use this measurement to figure out how many bags of concrete to use.
If you divide 3.93 cubic feet by 27 (3.93/27) = .146 cubic yards. Dividing cubic feet by 27 (a cubic yard) will give you the concrete yardage. This would be good to know if you had a lot of sono-tubes or a large cylinder to fill.
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