Concrete Calculator
Your Results
Concrete Driveway
How thick, what PSI, rebar or mesh? Full guide for a residential or commercial driveway pour.
Backyard Patio
3–4 inch slabs for foot traffic. Material list, form building, and curing tips.
Fence Post Footings
Depth, diameter, and how many bags of Quikrete per post for a solid, lasting fence.
Gravel Driveway
Depth recommendations, compaction layers, and ton calculations for crushed stone driveways.
How to Use These Calculators
Measure your project area in feet. For irregular shapes, break it into rectangles and add the areas together. Always measure at the widest points.
Enter your dimensions and thickness. Our calculators automatically add a 10% waste factor — the industry standard to account for spillage and uneven subgrades.
Use the bag count or cubic yards result to buy the right amount. Under 1.5 yards — buy bags. Over 1.5 yards — get a ready-mix quote from your local plant.
All of our calculators are built by contractors for homeowners. Every result includes a 10% waste factor because in the real world, concrete projects always use slightly more than the theoretical volume due to subgrade variations, spillage during mixing, and form bleed. Running short mid-pour causes cold joints — structural weak points that shorten your slab's life. Always buy slightly more than the minimum calculated amount.