Concrete Calculator
NEWCalculate concrete volume needed for slabs, footings, and columns. Get results in cubic yards, cubic meters, and number of 60lb or 80lb bags.
Enter dimensions in feet. Depth can be inches if you prefer — use the depth field with inches and check the box below.
How to use Concrete Calculator
- Select your unit system (feet or meters) and shape type (slab, footing, or column).
- Enter the dimensions: length, width, and depth for slabs; diameter and height for columns.
- Click Calculate to see cubic yards, cubic meters, and the number of 60lb/80lb bags needed.
What is Concrete Calculator?
A concrete calculator helps builders and contractors determine how much concrete is needed for a project. Whether you are pouring a slab, digging footings, or setting columns, knowing the exact volume prevents over-ordering (wasting money) or under-ordering (causing delays).
This calculator supports rectangular slabs, linear footings, and cylindrical columns. It works with both imperial (feet) and metric (meters) measurements, and accounts for depth entered in inches or centimeters.
FAQ
- How many 60lb bags of concrete make a cubic yard?
- You need approximately 60 bags of 60lb concrete mix to make one cubic yard. Each 60lb bag yields about 0.45 cubic feet of concrete.
- How do I calculate concrete for a slab?
- Multiply length x width x depth (all in feet), then divide by 27 to get cubic yards. For a 10x10 slab at 4 inches thick: 10 x 10 x 0.333 / 27 = 1.23 cubic yards.
- Should I order extra concrete?
- Yes, always order 5-10% extra to account for waste, uneven ground, spillage, and form variations. Running short during a pour is very costly.
- What is the difference between 60lb and 80lb bags?
- An 80lb bag yields about 0.60 cubic feet while a 60lb bag yields about 0.45 cubic feet. You need fewer 80lb bags but they are heavier to handle.
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