4 inch
30×30 (4 in)
Quick estimates + bag counts, with links to calculators and planning notes.
Concrete Slab Size Pages (4″ & 6″)
Pick a common slab size and get quick estimates for cubic yards, cubic feet, and bag counts. Use filters to switch between 4" and 6" thickness.
What You Can Do on This Page
Use this slab hub to browse common slab sizes, compare 4-inch and 6-inch thickness, and jump directly to pages that estimate cubic yards, cubic feet, and bag counts. It is designed for fast planning when you want a size-based answer before opening a calculator.
If you already know the slab size, open a matching page. If your job has custom dimensions or unusual waste, use the slab calculator instead. The goal of this hub is to help you get to the closest estimate quickly.
Best Way to Use the Hub
- Filter by 4 inch or 6 inch thickness before comparing sizes.
- Use search when you already know a size like 12x20 or 14x24.
- Open the calculator when your slab dimensions are custom or irregular.
Popular slab sizes
Tap a size to filter results instantly.
All Slab Size Pages
1 results
Slab Size Pages FAQ
Should I use the 4-inch or 6-inch slab filter?
Use the 4-inch filter for lighter residential slabs such as patios or walkways, and the 6-inch filter when you need thicker slabs for heavier loads or more demanding use cases. Always confirm the final slab design for your project conditions.
What is the difference between a slab size page and the slab calculator?
A slab size page gives you a fast estimate for a common size, while the slab calculator is better when your dimensions, thickness, or waste allowance are custom.
Are the bag counts and cubic yards exact?
No. They are planning estimates. Final material needs can change with site conditions, over-excavation, waste, and the yield printed on the product you buy.
Do these slab pages include a waste allowance?
They are meant for planning, but the right waste allowance depends on the pour, formwork, and jobsite conditions. It is still smart to review the final number before ordering concrete.
Can I use these slab pages for patios, driveways, and shed slabs?
Yes. They work well as quick planning pages for common slab projects such as patios, walkways, driveways, pads, and shed bases, as long as you confirm the final thickness and reinforcement needs for the job.