Concrete Calculator
Pick a shape, set waste (default 10%), and see cubic yards plus bag counts for 40, 60, and 80 lb mix. Print or copy a shopping list. No account. Units: feet and inches.
The count
Why these numbers
How this was calculated
Volume comes from the shape, then a waste percent (default 10%) is added. Cubic yards are that volume divided by 27 and left in decimals. Bag counts divide the same cubic feet by a published yield and round up, because a store sells whole bags. QUIKRETE Concrete Mix data sheet #1101 states a 40 lb bag yields approximately 0.30 cu ft, a 60 lb bag yields approximately 0.45 cu ft, and an 80 lb bag yields approximately 0.60 cu ft. Buy one size, not all three. This is a planning estimate, not a structural design. Call 811 before you dig.
Bag counts use published yields for a standard concrete mix, not a store partnership. QUIKRETE Concrete Mix data sheet #1101 states a 40 lb bag yields approximately 0.30 cu ft, a 60 lb bag yields approximately 0.45 cu ft, and an 80 lb bag yields approximately 0.60 cu ft. Source: QUIKRETE Concrete Mix data sheet (product #1101). HomeFixMath is not affiliated with The QUIKRETE Companies. Fast-setting and other mixes can yield less — read the bag you buy.
HomeFixMath — Concrete shopping list
Shopping list
Enter valid measurements above to build your list.
The 80, 60, and 40 lb groups are the same pour. Buy one size.
Shop later
Buy links are not connected yet. Copy or print this list and match the bag in the aisle. Each line marked Link pending is a placeholder, not a store link.
When a retailer program is approved, a real link can replace a Link pending slot. See Affiliate Disclosure.
Planning estimate only — not a structural design or a code check. Verify the pour on site. Call 811 before you dig.
FAQ
How many 80 lb bags are in a cubic yard? At the 0.60 cu ft yield published for QUIKRETE Concrete Mix, 27 ÷ 0.60 = 45 bags per cubic yard before waste. Add your waste percent, then round up to a whole bag.
Why do bag counts round up? Stores sell whole bags. If the math comes out to 36.67 bags, you buy 37. The page shows the exact figure before that round-up.
Where do the bag yields come from? QUIKRETE Concrete Mix data sheet #1101: a 40 lb bag yields approximately 0.30 cu ft, a 60 lb bag approximately 0.45 cu ft, and an 80 lb bag approximately 0.60 cu ft. HomeFixMath is not a QUIKRETE partner. Other mixes, including fast-setting, can yield less — read the bag you buy.
Does this design a footing or meet code? No. It is a volume and shopping estimate only. It does not check thickness, reinforcement, frost depth, or local rules. Verify the pour on site. Call 811 before you dig.
Planning estimate only. Confirm the yield on the bag you buy, and the thickness on site. Not engineering advice. Call 811 before you dig.