Which tool fits the job
These calculators turn tape-measure numbers into the units materials are sold in. Use the square footage calculator for anything priced by area (flooring, sod, pavers, paint coverage), the cubic yard calculator for bulk materials sold by volume (concrete, topsoil, mulch, gravel) and the board foot calculator for hardwood priced by the board foot. For a whole job, a project planner does these steps for you and prices the rest of the shopping list.
Plan in this order
Sketch the space, split it into simple shapes, measure each one and round up only at the end. An L-shaped room is two rectangles: 12 × 10 ft plus 6 × 8 ft is 168 sq ft. Then take away what you won’t cover: a 6 × 3 ft kitchen island leaves 102 sq ft of a 12 × 10 ft kitchen.
Common mistakes
- Mixing inches and feet. A depth of 4 in is 0.333 ft; typed as 4 ft, the order is 12 times too big. A 12 × 12 ft bed 4 in deep is 48 cubic feet, or 1.78 cubic yards.
- Dividing by the wrong number. A yard is 3 ft each way, so a square yard is 9 sq ft and a cubic yard is 27 cubic feet.
- Forgetting settling. Fill, topsoil and gravel bases compact, so add 10–15%.
- Board feet for framing lumber. A 2×4×8 is 5.33 board feet on nominal sizes, though it measures about 1½ × 3½ in. Framing lumber is sold by the piece; board feet matter for hardwood.
- Rounding metric too early. A foot is exactly 0.3048 m and a square meter is 10.764 sq ft; convert once, at the end.
Then round up to what the supplier sells, usually half or whole yards.