Patio cost estimate
20x20 Concrete Patio Cost
A 20 ft × 20 ft concrete patio is 400 square feet. At a standard 4-inch thickness it needs about 5.43 cubic yards of concrete (with 10 % waste) and costs roughly $2,400 – $4,800 installed with a plain broom finish.
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Material & Cost Breakdown
| Metric | Value | Notes |
|---|---|---|
| Square footage | 400 sq ft | 20 ft × 20 ft |
| Thickness | 4 in | Standard residential |
| Concrete volume | 4.94 yd³ | Before waste |
| Order volume (10% waste) | 5.43 yd³ | Ready-mix ordering target |
| 80 lb bags needed | 245 bags | Including waste |
| 60 lb bags needed | 326 bags | Including waste |
| Ready-mix material cost | $706 – $896 | ~$130–$165 per yard delivered |
| Installed cost (broom) | $2,400 – $4,800 | $6–$12 per sq ft |
* Installed cost assumes a standard broom finish, easy site access, and a prepared sub-base. Decorative finishes, tear-out, poor soil, or pump-truck access will move the price higher.
How We Calculated It
- Area: 20 ft × 20 ft = 400 sq ft
- Volume: 400 sq ft × (4 in ÷ 12) = 133.3 cu ft ÷ 27 = 4.94 yd³
- With 10% waste: 4.94 × 1.10 = 5.43 yd³
- Bags (80 lb): 5.43 × 27 ÷ 0.60 cu ft/bag ≈ 245 bags
FAQs
How much does a 20x20 concrete patio cost?
A 20x20 (400 sq ft) concrete patio costs roughly $2,400 to $4,800 installed with a broom finish in 2026. Decorative finishes, tear-out, and site prep can raise the price.
How many cubic yards for a 20x20 patio?
At 4 inches thick, a 20x20 patio needs about 4.94 cubic yards before waste and 5.43 yards after a 10% ordering allowance.
How many 80 lb bags for a 20x20 patio?
You would need about 245 bags of 80 lb concrete (including 10% waste). Above roughly one cubic yard, ready-mix is usually cheaper and easier than bags.
Planning Your 20x20 Pour
When preparing to pour a 20 ft × 20 ft concrete patio, proper planning is essential to keep your project on budget. The dimensions directly determine the total square footage, which in turn dictates the amount of labor, forming materials, and finishing time required.
The thickness is equally important. While 4 inches is standard for this type of patio, increasing the thickness by just one inch will significantly increase the total cubic yards of concrete needed. Always ensure your sub-base is properly compacted and leveled; an uneven base can lead to thick spots that consume more concrete than your initial estimate predicted. Lastly, ordering with a 10% waste margin is a standard industry practice to account for minor spills, uneven ground, and the small amount of concrete left inside the delivery truck.