If you are standing in the hardware store aisle wondering how many cubic feet in 80 lb bag of concrete, the short and definitive answer is: 0.60 cubic feet.
Whether you buy Quikrete, Sakrete, or a generic brand, standard high-strength mix yields the same volume. One 80 pound bag of concrete cubic feet translates to 0.60 ft when mixed properly with water. In this quick reference guide, we break down exactly how this translates to cubic yards and common DIY projects.
80lb vs 60lb vs 40lb Coverage Comparison Table
Before lifting heavy bags into your truck, it helps to understand the math. Here is exactly how much concrete in 80 lb bag you get compared to the lighter alternatives on the pallet:
| Bag Size | Yield (Cubic Feet) | Yield (Cubic Yards) |
|---|---|---|
| 80 lb Bag | 0.60 ft | 0.022 yd |
| 60 lb Bag | 0.45 ft | 0.017 yd |
| 40 lb Bag | 0.30 ft | 0.011 yd |
How Many 80lb Bags Per Cubic Yard?
Because one cubic yard contains 27 cubic feet, we can do the simple math: 27 0.60 = 45. You need exactly 45 bags of 80lb concrete to make one full cubic yard. Remember that mixing 45 bags by hand is an exhausting physical task. For volumes larger than 1 yard, we highly recommend calling a ready-mix truck.
How Many Bags for Common Projects
Knowing the 80lb bag concrete cubic feet is only helpful if you apply it to your real-world dimensions. Here is what 0.60 cubic feet actually builds:
- Fence Posts: Setting a 4x4 post in a 10-inch diameter hole that is 2 feet deep requires roughly 1.5 bags (or 2 bags to be safe).
- Small AC Pad: A 3x3 foot square pad poured at 4 inches thick equals 3 cubic feet. At 0.60 ft per bag, you will need 5 bags.
- Mailbox Post: A standard 8-inch hole dug 2 feet deep requires 1 bag.
Use the 80lb Bag Calculator
Don't do the math in your head. Enter your exact project length, width, and depth into our free calculator. It instantly applies a 10% waste factor and outputs the precise number of 80lb bags you need to buy.
Calculate 80lb Bags Instantly
Enter your dimensions and get an exact bag count based on the 0.60 ft rule.
Open 80lb Bag CalculatorFrequently Asked Questions
How many cubic feet in an 80lb bag of concrete?
One 80-pound bag of concrete mix yields exactly 0.60 cubic feet when mixed with water and poured.
How much concrete in 80 lb bag in yards?
An 80lb bag contains 0.022 cubic yards of concrete.
How many 80lb bags equal one cubic yard?
You need exactly 45 bags of 80lb concrete to make one full cubic yard.
Does Quikrete yield differently than Sakrete?
No. All standard 80lb high-strength concrete mixes yield the same 0.60 cubic feet regardless of the brand name.
How much water do I add to an 80lb bag?
Typically, an 80lb bag requires 3 to 4 quarts (about 3/4 of a gallon) of clean water, but always check the manufacturer's back-of-bag instructions.