Concrete Bag Calculator
Premixed concrete comes in bags. This shows how many of each size a job needs, so you can compare the price of each size at the store.
- Free
- Works offline after your first visit
- Saves on this device
- No sign-up
- Updated
How it works
Each bag makes a set amount of wet concrete. The yields used here are 0.30 cubic feet for a 40 lb bag, 0.45 for a 60 lb bag and 0.60 for an 80 lb bag. The volume is divided by the yield and rounded up.
Add extra for spills and uneven ground. If the printed yield on your bag is different, use that figure, since the label is the final word.
Worked example
A job that needs 1 yd³ of concrete takes 45 of the 80 lb bags, 61 of the 60 lb bags, or 91 of the 40 lb bags.
Questions
Why round up?
Bags come whole. A part bag still means one more bag at the store, so rounding up means the last bit is covered.
Do different brands hold the same amount?
Close, but not always the same. Check the yield on your bag and use that number for the most accurate count.
Is a bag cheaper than a truck load?
For small jobs bags are often simpler. For larger pours, ask a supplier for a delivered price and compare it with the bag cost per cubic yard.
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