Calculate exact number of 40lb, 60lb, or 80lb concrete bags needed for slabs, footings, posts, and small projects.
🧱 Concrete Bag Calculator
Cubic Feet
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Cubic Yards
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Bags Needed
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💡 Pro Tip
For projects over 1.5 cubic yards, order ready-mix concrete delivery. It is cheaper, stronger, and far less labor intensive than mixing bags by hand.
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Frequently Asked Questions
Q: How many 80lb bags of concrete make a cubic yard?
It takes approximately 45 bags of 80lb concrete to make 1 cubic yard. For 60lb bags you need 60 bags, and for 40lb bags you need 90 bags per cubic yard.
Q: How many bags of concrete do I need for a 4x4 post hole?
A 12-inch diameter hole, 3 feet deep needs about 0.26 cubic feet of concrete = 1 bag of 60lb or 80lb mix per post hole.
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