How to estimate concrete for a slab or patio
For a simple rectangular pour, calculate cubic feet from length × width × thickness, then divide by 27 to convert cubic feet to cubic yards. PrepMyBuild keeps the raw volume separate from the purchasing quantity so you can see exactly how the waste allowance changes the order.
Why your measurements stay editable
PrepMyBuild uses your description to help fill the fields, then calculates the result from the measurements and assumptions shown on screen. You can review and change those inputs before using the estimate.
Use the result as a purchasing conversation
Material estimates are most useful when checked against supplier packaging, delivery rules, product-specific coverage and the conditions at the actual project site. PrepMyBuild is designed to make those checks easier, not replace them.