Estimate concrete volume, cubic yards, bags, and cost for slabs, patios, driveways, and footings.
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This concrete calculator helps homeowners, contractors, and DIY builders estimate how much concrete is required for a project. Whether you are pouring a patio, driveway, slab, or footing, knowing the correct volume prevents wasted material and unexpected costs.
In addition to calculating cubic feet and cubic yards, this tool also estimates the number of bags required and total cost. Below the calculator, you will find real-world examples, cost breakdowns, and practical tips used in actual construction projects.
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Enter the length and width of your project area in feet. Then input the depth in inches. For most residential slabs, depth ranges from 4 to 6 inches, while footings and structural pours may require deeper measurements.
Select the bag size you plan to use. Larger bags (80 lb) are more efficient for bigger jobs, while smaller bags may be easier to handle for DIY projects. Finally, enter the cost per bag to estimate total project cost.
The calculator will automatically convert your inputs into cubic feet, cubic yards, number of bags, and total weight.
Concrete costs vary based on material type, location, and labor. Typical price ranges include:
For example, a small patio may cost a few hundred dollars using bagged concrete, while a driveway or large slab may cost significantly more when labor and delivery are included.
Small Patio: A 10×12 slab at 4 inches deep requires about 1.5 cubic yards of concrete.
Driveway: A 20×20 driveway at 6 inches deep requires roughly 7.4 cubic yards.
Footing: A 2×20 footing at 12 inches deep requires about 1.5 cubic yards.
These examples show how depth and size dramatically affect total material requirements and cost.
This tool is ideal for estimating concrete for residential projects such as patios, sidewalks, slabs, and small foundations. For large commercial jobs or structural engineering work, always consult a professional.
How much concrete do I need?
Multiply length × width × depth. This calculator automatically converts the result into cubic yards and bags.
Should I order extra concrete?
Yes, always order 5–10% extra to account for waste, spillage, and uneven surfaces.
What depth should a slab be?
Most residential slabs are 4–6 inches thick, while driveways and load-bearing areas may require 6 inches or more.
Is bagged concrete or ready-mix better?
Bagged concrete is ideal for small projects, while ready-mix is more efficient for large pours.