Introduction
This Quikrete calculator helps you figure out how much concrete you need for your project. Just pick your project type, enter your measurements, and the tool does the math for you. It works for slabs, footings, walls, columns, holes, circular pads, curbs, stairs, and fence posts. The calculator shows your total concrete volume in cubic yards, cubic feet, and cubic meters. It also tells you how many bags of Quikrete premixed concrete to buy in 40 lb, 50 lb, 60 lb, or 80 lb sizes. You can add a waste buffer so you don't run short, and you can enter a price per cubic yard to get a cost estimate. Whether you are pouring a small patio or setting posts for a new fence, this tool saves you time and helps you avoid buying too much or too little concrete.
How to Use Our Quikrete Calculator
Enter your project dimensions and preferences below. The calculator will tell you how much concrete you need in cubic yards, cubic feet, and cubic meters. It also shows how many bags of Quikrete to buy.
Project Type: Pick the shape you are pouring. Choose from Slab, Hole/Column, Circular Slab/Tube, Curb & Gutter, Stairs, or Post Setting.
Length: Enter how long your project is. Use the dropdown to pick feet, inches, yards, meters, or centimeters.
Width: Enter how wide your project is. Use the dropdown to change the unit.
Thickness / Depth: Enter how thick or deep your concrete pour will be. Most slabs are 4 inches thick.
Diameter: For round projects like columns or holes, enter the diameter instead of length and width.
Outer Diameter: For tubes or circular slabs, enter the full outside diameter.
Inner Diameter: For hollow tubes, enter the inside diameter. Leave it at 0 for a solid circle.
Curb Depth: Enter how deep the curb section extends below the surface.
Gutter Width: Enter how wide the gutter part of your curb and gutter is.
Curb Height: Enter how tall the curb rises above the gutter.
Flag Thickness: Enter the thickness of the flat gutter slab.
Run (Tread Depth): For stairs, enter how deep each step is from front to back.
Rise (Height per Step): Enter the height of each single step.
Number of Steps: Enter how many steps your staircase has.
Hole Depth: For post setting, enter how deep you will dig each post hole.
Post / Hole Diameter: Pick your post size and matching hole size from the dropdown.
Number of Posts: Enter how many posts you need to set.
Pieces / Quantity: If you are building more than one of the same item, enter the total count here.
Waste Buffer (%): This adds extra concrete to cover spills, uneven ground, and waste. The default is 10%, which works well for most jobs.
Price per yd³: Enter a dollar amount if you want to see the total estimated cost for ready-mix concrete. This field is optional.
Bag Sizes to Compare: Check the Quikrete bag sizes you want to compare. The calculator shows how many bags you need for each size you pick.
Press Calculate to see your results. Press Reset to clear everything and start over.
How to Calculate Concrete for Your Project
This Quikrete concrete calculator helps you figure out how much concrete you need for any job. It works for slabs, footings, walls, columns, round pads, curbs, stairs, and fence posts. Just pick your project type, enter your measurements, and the calculator does the math for you. It tells you the total volume of concrete in cubic yards, cubic feet, and cubic meters. It also shows how many bags of Quikrete pre-mixed concrete to buy in 40 lb, 50 lb, 60 lb, or 80 lb sizes.
Why Getting the Right Amount Matters
Buying too little concrete means you have to stop your pour and make another trip to the store. This can cause weak spots called cold joints where the old and new concrete meet. Buying too much wastes money. That is why this tool includes a waste buffer option. Most pros add 10% extra to cover spills, uneven ground, and form bulging. You can change this number to fit your needs.
Understanding Bag Sizes
Quikrete sells concrete in bags of different weights. A 40 lb bag fills about 0.30 cubic feet. A 60 lb bag fills about 0.45 cubic feet. An 80 lb bag fills about 0.60 cubic feet. Bigger bags cost less per cubic foot, but they are heavier to carry and mix. For small jobs, lighter bags are easier to handle. For big jobs, 80 lb bags save time and money.
When to Use Fast-Setting Concrete
The post setting option uses 50 lb fast-setting Quikrete. This type of concrete sets in about 20 to 40 minutes. You do not need to mix it in a wheelbarrow. You just pour it dry into the hole around the post and add water. It is made for setting fence posts, mailbox posts, and deck posts.
When to Order Ready-Mix Instead
If your project needs more than about 1 cubic yard of concrete, think about ordering a ready-mix truck. Mixing that many bags by hand takes a long time and a lot of effort. Use the optional price field in this calculator to estimate the cost of ready-mix delivery based on your local price per cubic yard.
Related Construction Calculations
Concrete work often goes hand in hand with other building tasks. If you are pouring a slab for a patio or garage, you may also need to calculate rebar reinforcement to strengthen your pour. Once you know the weight of your pour, our Concrete Weight Calculator is useful for planning transport and structural support.