Category
Flooring & Tile Calculators
Floor and wall coverings are sold in boxes, so small measurement errors turn into an extra trip to the store. These tools include grout joints, cutting waste and box rounding to give you a realistic purchase quantity.
Which calculator do I need?
- Tile Calculator
- Find how many tiles and boxes you need for a floor, wall or backsplash — including the grout joints and a realistic allowance for cuts and breakage.
- Shower Tile Calculator
- Estimate tile for shower walls or a bathtub surround — back wall, side walls and tiled height — with openings subtracted.
- Flooring Waste Calculator
- Turn a room's area into the amount of flooring to buy, with a waste allowance suited to the installation pattern and rounding to full boxes.
- Grout Calculator
- Estimate how much grout to buy, based on your tile size, tile thickness and joint width.
Getting flooring and tile quantities right
Measure each room as a set of rectangles, add the areas, and choose a waste allowance that matches the layout: about 10 % for straight layouts, more for diagonal and herringbone patterns or rooms with many corners. Round up to whole boxes, and buy everything from the same production batch so the shade and size match.
Most floor coverings also need a flat, sound subfloor. Manufacturers state how flat it must be and, for wood and laminate, how long the boards should acclimatise in the room before fitting. Their instructions take priority over any rule of thumb.
- Keep a few spare tiles or boards from the same batch for future repairs.
- Floating floors need an expansion gap around the edges; check the manufacturer's figure before planning trims and thresholds.
- Grout and adhesive quantities depend on joint size and trowel notch, so calculate them separately.