Measure the pour area
Use finished dimensions for length and width. For irregular areas, split the project into smaller rectangles.
Concrete calculator
Patio Concrete Calculator
Calculate concrete volume and bag counts for backyard patios and outdoor pads.
Estimated concrete needed2.61 yd³ with 10% waste
- Cubic feet
- 64.00 ft³
- Cubic meters
- 1.81 m³
- 80 lb bags
- 107
- 60 lb bags
- 143
- 40 lb bags
- 214
How to use it
Enter slab thickness
Most patios and walkways use 4 inches. Driveways and load-bearing work may need more.
Order with waste
Use the 10% waste recommendation to cover spillage, uneven subgrade, and small measurement errors.
Related calculators
Concrete Slab Calculator Calculate concrete yards and bags for garage slabs, shed bases, pads, and flatwork. Driveway Concrete Calculator Estimate ready-mix concrete and bag counts for a residential driveway slab. Paver Calculator Estimate paver count for patios and walkways using area and common paver sizing. Concrete Footing Calculator Estimate concrete yards and bags for continuous strip footings. Concrete Stairs Calculator Estimate concrete for solid stair pours using width, tread depth, riser height, and step count. Concrete Wall Calculator Estimate concrete yards for wall pours using length, height, and thickness. Concrete Yards Calculator Calculate cubic yards of concrete from project dimensions. Concrete Bag Calculator Convert slab dimensions into 40 lb, 60 lb, and 80 lb concrete bag counts.
FAQ
Concrete estimating questions
How thick should a concrete patio be?
A 4 inch slab is common for many patios, but poor soil, hot tub loads, or local requirements can change the design.
How much concrete for a 16x12 patio?
At 4 inches thick, a 16 by 12 foot patio needs about 2.37 cubic yards before waste.
Can I pour a patio with bags?
Small patios can use bags, but larger patios usually favor ready-mix because bag counts rise quickly.