14×20 Concrete Slab (4 inches): Yards, Feet & Bags
This 14 ft x 20 ft concrete slab, 4 inches thick, is perfect for a patio or gazebo base. Decide between bagged concrete or ready-mix based on your site access and project scale.
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)
Always round to 0.25 yd³ when ordering and check yield on the label to ensure you have enough material.
Ensure your base is well-prepared and forms are secure to prevent shifting or settling.
Aim for a smooth finish and allow the slab to cure properly before heavy use, keeping it moist during the process.
How to Estimate This Slab in 3 Steps
Measure
Length 14 ft, width 20 ft, thickness 4 in.
Compute Volume
Area: 280 sq ft → volume: 93.3 ft³ → 3.46 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 should I consider when choosing between bags and ready-mix concrete?
Consider the size of your project and how accessible the site is for delivery; bags are great for smaller jobs, while ready-mix is more efficient for larger slabs.
How do I determine the right thickness for my concrete slab?
The thickness depends on the intended use; heavier loads may require a thicker slab to ensure durability.
What is the best way to prepare the base before pouring concrete?
Clear the area of debris, compact the soil, and create a level surface to prevent settling and cracking.
How do I ensure my concrete cures properly?
Cover the slab to retain moisture and protect it from extreme temperatures, which helps achieve a strong finish.
Related Slab Sizes
Ready to Calculate Your Project?
Get instant estimates for cubic yards, cubic feet, and bag counts. No signup required.