Project guide
Flooring & tiling: from room measurements to boxes you can order
Every floor project starts with the same number, the area you are covering, and ends with a purchase rounded to whole boxes, rolls, or kits. These calculators cover each step in between.
Which calculator to use when
What the project involves
A new floor is mostly a measuring and ordering job. You find the area of each room, choose a material, add a waste allowance that suits the layout, and convert the result into the packaging the store actually sells. Laminate, vinyl plank and engineered wood come in boxes with a printed coverage; tile is sold by the piece or by the box; carpet comes off a roll of fixed width; and epoxy floor coatings come as kits with a stated coverage per coat.
The waste allowance is where estimates most often go wrong. A rectangular room laid in a straight pattern needs far less spare material than a hallway with several doorways, a herringbone pattern, or tile laid on the diagonal. Carpet behaves differently again: because the roll width is fixed, waste depends on how the room fits the roll rather than on a simple percentage.
Order of work
- Sketch the floor and split it into rectangles. Measure each one and total the area with the Square Footage calculator.
- Choose the material and read its coverage per box, tile size, roll width, or kit coverage from the product label.
- Pick a waste allowance for the layout: lower for straight runs in simple rooms, higher for diagonal or patterned layouts, many corners, or brittle tile.
- Run the material calculator (flooring, tile, carpet, or epoxy coating) and round up to whole packages.
- Buy from one batch or dye lot where possible and keep a spare box for future repairs.
Common mistakes
- Measuring only the longest walls of an L-shaped room instead of splitting it into rectangles.
- Using one waste percentage for every layout; diagonal and herringbone patterns need noticeably more.
- Treating carpet like boxed flooring: a narrow room on a wide roll can waste more than any percentage suggests.
- Forgetting closets, alcoves, and the floor under appliances you plan to move.
- Buying the exact quantity with no spare, then struggling to match the batch or colour later.
Common questions
FAQ
How much extra flooring should I buy?
A straight layout in a simple room often starts around 5–10% extra. Diagonal tile, herringbone or chevron patterns, rooms with many corners, and brittle tile can need 15% or more. Check the installer or manufacturer guidance for your product and enter that figure as the waste allowance.
Should I calculate each room separately?
Yes, when rooms use different materials or layouts. Measure each rectangle, then either add the areas in the Square Footage calculator or run the material calculator per room so each room keeps its own waste allowance.
Do these calculators include underlayment, adhesive, or grout?
No. They estimate the main surface material only. Underlayment is usually sold by area, so the square footage result is a good starting point; adhesive and grout depend on the product, trowel size, and joint width, so follow the manufacturer coverage chart.
Which tool should I use for a garage floor?
For a thin epoxy floor paint or coating system, use the Epoxy Floor Coating calculator. If you are pouring a new slab first, size the concrete with the Concrete Slab calculator in the concrete and masonry guide.