*
The number one question that we acquire on ours hotline (1-866-ubraintv-jp.com) is, “how much concrete perform I need”? however let’s challenge it, unless you have a helpful real human being application for those boring math problems, you simply don’t treatment enough to maintain it. Well, currently you do have a real civilization application so stop go through the practice so you will certainly know how to perform it there is no calling the next time. Friend can also impress her friends at dinner next (if the subject about concrete should happen to come up). I would only recommend this topic for those ”friends” whereby you nothing mind if you were never invited earlier to again.

You are watching: How many bags of sakrete in a yard

For those who are an ext direct, and also want the brief cut answer please scroll to web links at the end of this blog.

How come Calculate just how Much Concrete ns Need

The very first thing you have to do is relax. It yes, really ain’t the hard. Don’t let terms like “cubic feet” and also “yield” and “density” stroked nerves you. There are basically 2 steps. The an initial step is figuring the volume the the an are you desire to fill. It doesn’t make any kind of difference if you desire to to fill it with concrete or vanilla ice cream cream. Volume is volume. Because of the quantity of concrete required for most work it is usually simplest to figure the volume in cubic feet. If your job is huge enough to calculate the volume in cubic yards instead of feet, call a ready mix concrete truck. Once you listen “cubic” think ice cube. An ice cube usually has three sides (at the very least the people you do in the trays in her freezer at home do). The method to find the volume the a cube is come multiple all 3 sides. If her cube to be a perfect cube and also it to be 2 feet broad and 2 feet long and also 2 feet deep, the volume would be 8 cubic feet. Concrete slabs room usually no perfect cubes so the math is a small different. If you were going to pour a slab the was 2 feet broad and 2 feet long it would not likely be 2 feet deep. It can be 4” deep i m sorry is a regular depth for a concrete slab. So currently the equation looks prefer this: 2’ x 2’x 4”. The problem is you have to get every little thing into the same units; you can not multiple feet through inches. This is wherein folks get hung up however it’s actually rather easy. Just multiple 2 x 2 x 4 ÷ 12. The prize is 1.3 cubic feet.

If you space filling a round hole in the floor to collection a article or mail box, the calculation because that volume is different than a cube or rectangle. The formula because that the volume that a round hole is pi r2 x depth. Or 3.14 x radius x radius x depth. The radius is half the broad of the hole. Unless you are doing a monster feet it could be easiest to perform this all in inches. If your hole is 36” deep and 10” wide, the calculate is 3.14 x 5 x 5 x 36 ÷ 1728. This gives you 1.6 cubic feet. If girlfriend forget the 1728 it is simply 12” x 12” x 12” or the number of cubic inch in a cubic foot.

So now that we recognize the volume the 2nd step is to calculation how countless bags the concrete that will take to fill the hole. On the bag it will certainly tell girlfriend how many cubic feet the bag will certainly fill. This is the “yield”. The yield on an 80 lb bag is around 6/10 (.6) cubic feet. If you take it the example over of 1.6 cubic feet, the calculation would be :

1.6 ÷ .6. = 2.7 bags

If you occur to it is in enthralled through math calculations I provide the complying with information on exactly how to calculation the yield that I claimed was .6 cubic feet for an 80 lb bag. The first thing you require to recognize is the “density” of the concrete. If I offer you a crate filled with concrete that steps 12” x 12” x 12” (or 1 cubic foot), exactly how much execute you think it will certainly weight? go ahead and take a guess- almost everyone gets it wrong. The price is 145 lbs. (If it was filled v beer it would certainly weigh 64 lbs.) This method the “density” of concrete is around 145 lbs every cubic foot. Currently that we have actually that information we can calculate the yield. Include up both the dry product in the bag (80 lbs) and the water the takes to mix it up (1 gallon i m sorry weighs 8.3 lbs) because that a total weight that 88.3 lbs. Then divide the complete weight through the thickness of the concrete.

88 ÷ 145 = .60 cubic feet.

See more: How Big Is 22 Cm In Inches ? Convert 22X25 Cm To In Convert 22X33 Cm To In

There is one technique for calculating the variety of bags forced which is also easier. Us have already done the math for you on concrete and also a variety of other products. Visit ours calculators page prior to your following project. Determine how much you require from home, the keep aisle or indigenous the jobsite.