Concrete calculator lets you estimate how much concrete you need to produce and how many bags of cement it requires for a specified purpose accounting for the size of elements, concrete density, weight, and spillage. Cement is usually sold in bags. Knowing the size of the bag (it says how much concrete we'll get out of it) our calculator will help you decide how many bags you need to buy. This way you can also estimate the concrete slab cost. If you would like to estimate the amount of concrete you need for columns, check a sibling calculators for concrete columns and tubes.
A lot of us have probably been in this situation: you decide to build your own house, a terrace or a fence. You go to a shop, buy X bags of concrete, and pleased with yourself you get to work right away. Somewhere in the middle you realize you have only one bag left. Irritated you go back to the shop buy another batch of concrete, go back, start working again and then... it's not enough, again. So the day's already over, the shop is closed, work's not done and tomorrow you need to go back to the shop again. Only this time you buy much more, just in case and by the end of work you're left with a half of all these extra bags of concrete with absolutely no use for them. You wasted time, you wasted money and it most certainly got on your nerves. All of this can be easily avoided. If you ever wonder "how much concrete do I need", instead of guessing use our concrete calculator.
All dimensions are given in feet by default. You can change them to any other unit by simply unlocking the field (the padlock button).
So let's say we have 4 concrete elements 3 feet long, 3 feet wide and 3 feet high each. Now we multiply
4 times (3*3*3). Pre-mixed concrete is usually sold by the cubic yard and this is the volume unit we use by default, but construction elements are usually measured in feet. Therefore our calculator shows the volume in cubic yards - in our example 4 cu yd. 4 cubic yards equals 108 cubic feet.
Sometimes you'll know how many slabs you need. Other times you'll just know what's the area that needs to be paved - feel free to provide any of these values. In our example, we'll have 36 square feet.
Once we have the above measurements we can get to the essence of the matter.
In our example let's leave the default measures. We need 4 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 16 201,03 lb. We assume 5% of waste and spillage and voila, we need 284 bags of concrete.
It's easy with out calculator - once you know how much concrete you need (in bags) and how many slabs you'll produce out of it, simply provide the price of the bag and you'll receive the concrete slab cost, a cost to pave your desired area, cost per unit of volume and the total cost of the material you need.
Now, this was relatively easy, determining the volume of elements other than rectangular might be a little bit more tricky however. To make out the volume other common three dimensional object, go to our volume calculator.
While we're around these areas, check out the density calculator, where you can calculate the density of any given object based on its weight and volume. .