Wall Tile Count Calculator
Net area after openings to pieces and boxes.
Inputs
Result
Formula
| Net area = perimeter × height − openings | |
| Pieces = net area ÷ (tile length × width) | |
| Count = ceil(pieces × (1+waste)) | |
| Boxes = ceil(count ÷ pieces per box) |
Bathroom 14 m perimeter tiled to 2.4 m with 3.6 m² of openings, 300×600 tiles, 8% waste and 8 pieces per box: 33.6 m² gross, 30.0 m² net; 166.7 pieces theoretical, 180 with waste, 23 boxes, and about 150 kg of adhesive.
FAQ
Should openings be fully deducted?
Separately. A window with reveals and a sill is still tiled, so deduct only the clear opening; a door is covered by the architrave but the wall above and beside is still tiled, so deduct the leaf area or not at all. Where the opening does not align with the tile module, cutting around it produces more waste - raise the waste figure when deducting.
What is the difference between wall tile and floor tile?
Interior wall tiles (ceramic) have water absorption above 10% - light, easy to cut, cheap, but weak and frost sensitive, so interior walls only. Porcelain tiles absorb under 0.5%, are strong and abrasion resistant and suit floors and exteriors. Bathroom walls commonly use ceramic, floors must use porcelain. Using interior wall tile outdoors leads to frost spalling.
Why keep spares?
Repairs - a leaking pipe, a moved socket or a cracked tile during drilling all need matching tiles, and colours differ clearly between batches, so replacements are unobtainable years later. Cuts around openings and corners also overrun. Shipping breakage of large format runs 1-2%. Three to five spares is standard practice and cheap insurance.
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Results are estimating aids only and are not a design basis. Construction and final accounts must follow the drawings, the applicable standards and an approved method statement. Anything affecting structural safety, shoring or falsework must be checked by a suitably qualified engineer.