Concrete Calculator 2025
Calculate concrete volume for slabs, footings, and columns
Project Dimensions
Total Concrete Needed
0 yd³
Volume Breakdown
| Cubic Feet | 0 ft³ |
| Cubic Yards | 0 yd³ |
| Waste Factor | +0% |
| Total | 0 yd³ |
Bags Needed
| 40lb bags | 0 bags |
| 60lb bags | 0 bags |
| 80lb bags | 0 bags |
*Based on standard premix concrete
How to Use
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1
Select the type of structure (Slab, Footing, or Column).
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2
Enter the dimensions (Length, Width, Depth/Height).
-
3
The calculator provides the required volume in Cubic Yards and Cubic Feet.
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4
It also estimates the number of 40lb, 60lb, and 80lb bags needed.
Frequently Asked Questions
How do I calculate how much concrete I need?
Calculate the volume of the space in cubic feet (Length x Width x Depth) and convert it to Cubic Yards (divide by 27). It's recommended to add 5-10% for waste and spillage.
How many bags of concrete make a yard?
It depends on the bag size. Approximately: 45 bags of 80lb mix, 60 bags of 60lb mix, or 90 bags of 40lb mix equal one cubic yard of concrete.
What is the difference between calculations for slabs vs footings?
The math is Volume = Area x Depth. Slabs are typically wide and thin, while footings are deep and narrow, but the core volume formula remains the calculation of cubic space to fill.