How Many Bags of Concrete Do I Need?
Combines a rectangular volume with your bag’s published cubic feet per bag.
Step 1: Units
Step 2
Enter project measurements
Use decimals if needed (e.g. 3.5).
Step 3
How to use this calculator
Enter L×W×D and bag yield from the product label.
What the math is doing
Volume from dimensions; bags = ceil(cu ft ÷ bag cu ft) with waste.
Frequently asked questions
Post holes?
Use column/sonotube mode for round holes.
80 vs 60 lb?
Change yield to match SKU.
Water?
Stay within manufacturer ranges.
Hot weather?
Set time admixtures are batch decisions.