Concrete Slab Calculator
Estimate the volume and number of pre-mixed concrete bags for slabs, footers, or round posts.
Last Updated: July 31, 2024
Concrete Calculator
Estimate the volume and number of concrete bags required for your project.
Estimated Materials
Concrete Volume Needed
1.23 yd³
Bags Required
73
(60 lb bags)
About the Concrete Calculator
This calculator helps you estimate the amount of concrete needed for your project. It also tells you how many pre-mixed concrete bags to buy. This helps you buy the right amount of material without waste.
How to Use the Concrete Calculator
- Select your **Project Shape** (Slab, Footer, or round Post Hole).
- Choose your preferred **Units** of measurement.
- Enter the dimensions for your project.
- Select the **Concrete Bag Weight** you plan to buy.
The calculator will instantly show the total volume of concrete needed and the number of bags to buy.
Concrete Bag Yields
The amount of concrete a bag gives you depends on its weight. Here are some common estimates:
| Bag Weight | Approximate Yield |
|---|---|
| 40 lb | 0.30 cu ft (0.011 cu yd) |
| 60 lb | 0.45 cu ft (0.017 cu yd) |
| 80 lb | 0.60 cu ft (0.022 cu yd) |
Note: Yields can vary by brand. Always check the information on the bag.
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