8×12 Concrete Slab (6 inches): Yards, Feet & Bags
This 8 ft x 12 ft concrete slab, with a thickness of 6 inches, is perfect for a shed base or an AC pad. Consider whether you prefer bags or ready-mix based on your access and project size.
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
Project Notes (Unique)
Round to 0.25 yd³ when ordering and check yield on the label to ensure you have enough material.
Ensure your base is properly compacted and forms are secure to prevent shifting during the pour.
Achieve a smooth finish and allow the slab to cure naturally, protecting it from extreme weather conditions during the process.
How to Estimate This Slab in 3 Steps
Measure
Length 8 ft, width 12 ft, thickness 6 in.
Compute Volume
Area: 96 sq ft → volume: 48.0 ft³ → 1.78 yd³.
Add Waste
Add a small buffer for spillage and uneven subgrade, then round up when ordering.
Planning Notes
Common uses: shed base, ac pad, small patio section.
For more context and conversions, see the Concrete Calculator hub.
Frequently Asked Questions
What’s the best way to prepare the base for my slab?
Clear the area of debris and vegetation, then compact the soil thoroughly to create a stable foundation.
Should I use bags of concrete mix or ready-mix for my project?
Consider ready-mix for larger jobs to save time, while bags might be better for smaller projects with limited access.
How do I determine the thickness of my concrete slab?
Choose thickness based on the intended use; heavier loads require thicker slabs for durability.
What should I do to ensure my concrete cures properly?
Keep the slab moist and protected from direct sunlight to allow for even curing and minimize cracking.
Related Slab Sizes
Ready to Calculate Your Project?
Get instant estimates for cubic yards, cubic feet, and bag counts. No signup required.