Concrete Patio Calculator
Use this concrete patio calculator to estimate cubic yards, cubic feet, and 80-lb bag counts for rectangular patios. For example, a 12×14 patio at 4 inches thick requires about 2.07 cubic yards of concrete before waste. Add 5–10% extra to account for spillage and uneven forms.
Enter your patio dimensions below and the calculator will convert total volume automatically. For base prep planning, use the gravel base calculator.
Inputs
Tip: For patio forms with straight edges, waste of 5–10% is common. Add more if you have curves, steps, or thickened borders.
Results
Material Cost Estimate
Prices vary by market; use local quotes.
Want a full breakdown of delivery fees, short loads, PSI pricing, and what affects ready-mix rates? See the concrete cost per yard guide.
Assumptions
- Rectangular patio with uniform thickness.
- Waste factor adds extra volume for spillage and form variation.
- Bag yield is an approximation; check your product label.
Common Patio Sizes & Concrete Needed
| Patio Size | Thickness | Cubic Yards | 80-lb Bags |
|---|---|---|---|
| 10×12 ft | 4 in | 1.48 yd³ | 33 bags |
| 12×12 ft | 4 in | 1.78 yd³ | 38 bags |
| 12×14 ft | 4 in | 2.07 yd³ | 44 bags |
| 14×16 ft | 4 in | 2.99 yd³ | 63 bags |
| 16×20 ft | 4 in | 3.95 yd³ | 83 bags |
Estimates include 10% waste. Larger patios are typically ordered as ready-mix.
Example
A 14 ft × 12 ft patio at 4 inches thick with 10% waste is 2.28 yd³ of concrete. Increase thickness for heavy features like grills or fireplaces.
Patio Calculator FAQs
How thick should a concrete patio be?
Most residential patios are 4 inches thick. Increase to 5–6 inches for heavy furniture or hot tubs.
Should I use ready-mix or bags?
If your project exceeds 1 cubic yard (about 40–50 bags), ready-mix is usually more efficient.
How much does a concrete patio cost?
Concrete patios typically cost $6–$12 per square foot depending on thickness, reinforcement, and finish. See the concrete cost per yard guide for detailed pricing.