Ordering the right amount of tile is mostly three steps: measure the area, add a little for cuts and breakages, then round up to whole boxes. This guide walks through each step, and includes a live calculator so you can see the boxes stack up as you change the numbers.
1. Measure the area
Measure length × width in metres for each surface you will tile. For L-shaped rooms, split the space into rectangles, calculate each, then add them together.
- Example: a bathroom floor 2.4 m × 1.8 m = 4.32 m²
- Walls: measure each wall separately and add them up
- Do not worry about millimetres — round up slightly if you are between marks
2. Add wastage
Most installers recommend about 10% extra for cuts, breakages and a spare box for future repairs. On Trident product pages the calculator has a “Add 10% for cuts & wastage” checkbox — it is on by default.
Complex layouts, diagonal laying or lots of niches may need more than 10%. Ask your tiler if you are unsure.
3. Convert area into boxes
Every area-sold product lists m² per box in the specifications. The calculator divides the area you need by that coverage, then rounds up to the next whole box.
You will often receive slightly more m² than you typed in. That is because the last box is never sold half-full.
Remember
Try the interactive calculator
Change the room size, coverage per box and box price below. Watch the boxes appear and fill with tiles — empty slots in the last box show leftover coverage you still pay for because tiles ship in whole cartons.
On a real product page the same logic runs against that product’s exact coverage and price, and feeds straight into Add to basket.
