How to Calculate the Right Amount of Ready-Mix Concrete for Your Slab
https://thebuildersguide.focalledger.com/posts/how-to-calculate-the-right-amount-of-ready-mix-concrete-for-your-slab
To figure out how much ready-mix concrete you need for a slab, measure the slab's length, width, and thickness in feet, then multiply them together to get cubic feet. Divide that number by 27 to convert to cubic yards—that's the standard unit ready-mix companies use. For a 10x10 foot slab that's 4 inches thick, that's about 1.23 cubic yards, so I'd order 1.25 to be safe and avoid a short load.