Concrete estimator - tube lets you estimate how many bags of cement you need for tube shaped concrete elements - cement is usually sold in bags. If you know the size of the bag, our calculator will help you decide how many bags you need to buy for your project. All you need is a couple of dimensions. Using our concrete calculator you can also figure out overall volume and weight of you concrete tubes. If you would like to estimate the amount of cement you need for differently shaped elements, check our sibling concrete calculators for columns and slabs.
To figure out how much concrete to buy you simply need to multiply its volume by its density to determine its weight. It is a little more complicated for tubes but you can calculate it easily using our concrete estimator. This is how it's done:
All dimensions are given in default units. You can change them to any other unit by simply unlocking the field (the padlock button).
So let's say we have 5 concrete tubes with an inner diameter of 1,3 ft and outer diameter of 1,6 ft, 8 feet high each. Construction elements are usually measured in feet but pre-mixed concrete is usually sold by the cubic yard, therefore our default volume unit is cubic yards. In our example 1,01 cu yd (27,33 cubic feet).
Once we have the above measurements all that is left to do is to:
In our example we'll calculate using default measures. We need 1,01 cubic yards of cement, our producer sells cement in bags weighing 60 lb with a 150 lb/cu ft density. Total weight of concrete that we need is 4100,04 lbs. We assume 5% of waste and spillage. Now we know that we need 72 bags of cement.
A yard of concrete is simply a cubic yard defined as the volume of a cube with sides of 1 yard. A yard has 3 feet or 36 inches in length. Mixed concrete is sold by cubic yards - therefore it is our default unit of volume.