Project calculator
Concrete Slab Calculator
Estimate concrete for patios, pads, and standard slab pours with quick 4-inch and 6-inch thickness presets.
This page keeps slab estimating focused so you can move from dimensions to yards and bag counts faster while still checking the slab thickness that fits the job.
Estimate slab concrete
Use the slab dimensions below, then choose the common thickness preset that matches your job.
Main result
Estimated slab concrete
2.56 yd³
The slab page keeps thickness decisions and purchase outputs in the same view so the estimate is faster to check before you order.
Cubic feet
69.12 ft³
60 lb bags
154
80 lb bags
116
Estimated cost
$371
Before you order
Using the 4-inch slab preset. Treat it as a planning starting point and confirm thickness against the slab use, base prep, load, and any local requirements.
Questions people usually ask next
Still unsure what could change the number or what to check before you order?
Use these answers to clear up the usual sticking points, understand what the result means, and move to the next step with more confidence.
Explore the next useful tool
Still figuring out what to calculate next or what else you should check before you buy?
Start with the tool, converter, or guide that matches your next question. You can compare materials, check another project type, or get quick planning help without losing momentum.
Concrete Slab Calculator
Use slab thickness presets for patios, pads, and standard flatwork.
Post Hole Concrete Calculator
Plan concrete for fence, deck, and mailbox posts.
Material Depth Guide
Check slab and footing depth starting points before you lock in dimensions.
Square Feet to Cubic Yards Converter
Convert square feet and depth, then move into a concrete estimate.