Palette says

Only measure what you actually want grass on. Subtract the driveway, the patio, the beds, the pool, and the shed pad. People trace the whole lot and end up with two pallets they have nowhere to put.

Palette says

Order 5% over what you measured. Yards are never rectangles, and every curve, tree ring, and walkway edge costs you a piece off the end of a roll. Coming up half a pallet short is not a same-afternoon fix, because it means booking another cut, and that sod lands 24 to 48 hours after it.

Palette says

On compacted clay or new-construction fill, yes. An inch across the lawn is about one cubic yard per 324 square feet. Sod on prepped soil roots in 10 to 14 days; sod laid straight onto clay can take a month.