10×18 Concrete Slab (4 inches): Yards, Feet & Bags
This 10 ft x 18 ft concrete slab is perfect for a patio or gazebo base. Decide between using bags or ready-mix based on your access and the amount of waste you expect.
Choose Your Calculator
Slab Calculator
Enter any custom length, width, and thickness to get cubic yards and bag counts.
Open Slab CalculatorBag Calculator
Choose 40/60/80 lb bag sizes and estimate counts for your exact volume.
Open Bag CalculatorWant other sizes? Browse all slab size pages
Quick Answer
Tip: Always confirm the yield printed on your bag label. Bag yield guide
Large pour: consider ready-mix delivery for speed and consistent results. Bag counts this high can take significant mixing time.
Project Notes (Unique)
Round to 0.25 yd³ when ordering, and ensure you have proper delivery access for the truck.
Ensure your base is well-prepared and forms are secure to prevent shifting or settling.
Apply a smooth finish and protect the slab while it cures to ensure durability.
How to Estimate This Slab in 3 Steps
Measure
Length 10 ft, width 18 ft, thickness 4 in.
Compute Volume
Area: 180 sq ft → volume: 60.0 ft³ → 2.22 yd³.
Add Waste
Add a small buffer for spillage and uneven subgrade, then round up when ordering.
Planning Notes
Common uses: patio, gazebo base, walkway section.
For more context and conversions, see the Concrete Calculator hub.
Frequently Asked Questions
What’s the best choice between bags and ready-mix concrete?
Bags are great for small projects or tight spaces, while ready-mix is more efficient for larger slabs and offers consistent quality.
How do I account for waste when ordering concrete?
Always order a bit more than calculated to cover spills, over-excavation, or any miscalculations.
What’s essential for proper base preparation?
A well-compacted base is crucial; ensure it's level and free of debris to prevent settling.
How thick should my concrete slab be?
For patios and walkways, a thickness of inches typically provides sufficient strength, but consider your specific use case.
Related Slab Sizes
Ready to Calculate Your Project?
Get instant estimates for cubic yards, cubic feet, and bag counts. No signup required.