Understand the estimate
Formula and assumptions
Project area is the sum of each shape. Purchase area = project area × (1 + waste). Pieces = purchase area ÷ piece area; boxes = purchase area ÷ package coverage. Both are rounded up.
Project area is the sum of each shape. Purchase area = project area × (1 + waste). Pieces = purchase area ÷ piece area; boxes = purchase area ÷ package coverage. Both are rounded up.
Assumptions to confirm
- Circular inputs use diameter.
- Package coverage is the usable coverage printed on the box.
- Pattern allowance and waste should include cuts, defects, and future repairs.
- Transitions, underlayment, mortar, and grout are listed separately.
Label every measurement and keep exclusions visible. Add the shapes in the calculator instead of hiding them inside one total.
Worked example
Input
A 12 × 14 ft room, 8 × 48 in planks, 20 sq ft per box, straight layout and 10% waste.
Planning result
The purchase target is 184.8 sq ft: about 70 planks and 10 boxes.
Common package sizes
Package conventions vary by brand and region. Enter the usable coverage or yield shown on the actual product instead of relying on the name or weight alone.
- Tile sold by piece or carton
- Plank flooring sold by carton
- Sheet goods sold by linear length
Frequently asked questions
How much waste should I use?
A simple square room often uses 8–10%. Diagonal or complex layouts commonly need 12–15% or more.
Can I mix room shapes?
Yes. Add rectangles, circles, or triangles and the planner combines their areas before waste.
Should closets be separate?
Separate areas make measurements easier to audit, but one combined area produces the same total.