Project ticket
How much concrete for a 10x12 patio?
Initial example: a 10x12 ft patio slab at 4in depth with 10% waste needs 74 bags of 80lb premix, 98 bags of 60lb premix, or 1.63 cu yd of concrete. These are alternative supply options. The calculator below starts with this example; adjust it for your project.
For rectangular volumes. Use the depth specified for your project; this calculator estimates material quantity, not structural design.
Quantities to confirm
Concrete purchase sheet
The starting yield is an example for this bag size. Replace it with the product label; bag weight alone does not determine yield.
- 80 lb bags44 cu ft with allowance ÷ 0.6 cu ft per bag; rounded up.
- 74bags
What this estimate assumes
- Raw volume: 40 cu ft. Waste allowance: 10%.
- Rectangular volume only; the entered depth comes from your design.
- Bag yield entered: 0.6 cu ft/bag. Whole bags provide 0.4 cu ft above the volume with allowance.
- Only the selected supply method is listed; alternatives are not added together.
Name your project & add notes Optional
Includes your quantities, assumptions and space to record the supplier, confirmed quantity, quote and delivery. No account required.
How to check this list before buyingCompare standard bag sizes and volume
Material totals
1 cu yd = 27 cu ft. Bag counts are rounded up to whole bags; volumes are displayed to two decimal places. The two bag sizes are alternatives.
Concrete shopping list
Choose one supply method; do not add these quantities together.
Yield assumptions: one 80lb bag = 0.6 cu ft; one 60lb bag = 0.45 cu ft. Check the actual bag label; products can differ.
The volumes above include the stated waste allowance. Confirm yield, ready-mix ordering increments and delivery requirements with your supplier before purchasing.
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Step-by-step for a 10x12 patio slab
- Start with a 10ft x 12ft rectangular area and an example depth of 4 inches. Use your actual design depth for your project.
- Volume = 10 x 12 x (4/12) = 40.00 cu ft before waste.
- Add 10% waste = 44.00 cu ft = 1.63 cu yd.
- Choose one supply option: 74 whole 80lb bags, 98 whole 60lb bags, or ready-mix based on 1.63 cu yd. Confirm product yield or delivery quantity with your supplier.
Compare bagged-mix and ready-mix quotes using this estimated quantity. Include delivery minimums and placement needs, and confirm the product yield or delivery quantity with your supplier. The estimate does not specify reinforcement, crew size, or construction details.
Open the full concrete calculator to adjust depth or add a waste factor.