Wall Tile Count Calculator
Net area after openings to pieces and boxes.
Quick answer
With the default inputs: Wall perimeter 14 · Tiling height 2.4 · Total opening area 3.6 m² etc.Tiles incl. waste 180 pcs
Edit the inputs below to recalculate.Inputs
Result
Tiles incl. waste
180pcs
| Gross wall area | 33.6m² |
| Net area after openings | 30.0m² |
| Area per tile | 0.180m² |
| Theoretical pieces | 166.7pcs |
| Pieces incl. waste | 180pcs |
| Boxes (whole) | 23boxes |
| Adhesive estimate | 150kg |
Net area = perimeter × height − openings. Three cautions: window reveals and sills are usually tiled too and must be added; door openings are often not deducted because architraves cover them and deducting tends to undersupply; and waste runs 5-8% for straight lay, 12-15% for diagonal or herringbone and 10% for large format cuts. Never mix batches on one wall, and keep 2-3 spares.
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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.
How to work it out
- Net area = wall perimeter × tiling height − opening area. Take the height from the design: 2.4 m in bathrooms, up to the ceiling in kitchens.
- The critical addition: the reveals of openings get tiled too, so add (opening perimeter × wall thickness) for each one. This is routinely missed and a single window reveal is 0.5-1 m².
- Divide the net area by the tile area for a theoretical count.
- Add 8-10% waste: wall tiling needs holes for pipes and boxes and mitred or trimmed external corners, so it wastes more than floors.
- Divide by tiles per box and round up. Borders and feature tiles are counted separately by length or piece.
Where it goes wrong
- Deducting the opening but not adding the reveal — a 1.5 × 1.5 m window in a 200 mm wall has 1.2 m² of reveal; two windows is 2.4 m², half a wall's worth.
- Allowing 5% waste — wall tiling has more holes and corner cuts, so 5% usually falls short and 8-10% is the norm.
- Ignoring external corners — a mitre removes a tile thickness along each edge, at least 0.1 m² per metre of corner; trim pieces are a separate purchase.
- Combining wall and floor tiles in one figure — different sizes, waste and prices; a combined total leaves one of them short.
Material and cost
300×600 wall tile 25-60 CNY/m², 400×800 40-90. Labour 40-60 CNY/m², mitred corners add 15-25 per metre. Adhesive 8-15 CNY/m², trim 5-15 per metre.
On site
- Waterproof and flood-test bathroom walls before tiling; reversing the order means demolishing the tiles.
- Start each wall with a full tile at the internal corner and leave cuts at external corners or out-of-sight edges — the visual difference is large.
- Choose whether floor tiles run under the wall tiles or vice versa and keep to it; changing mid-job misaligns every joint.
Basis
- GB 50210-2018 Code for acceptance of building decoration, Chapter 8
- GB 50209-2010 Code for acceptance of building floor construction, Chapter 6
- JGJ/T 298-2013 Technical specification for waterproofing of residential interiors
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.
Cite this page
Use this format in reports, method statements or coursework. The link is permanent.
Building Calculator. Wall Tile Count Calculator. 2026-10-25. https://jianzhujisuan.com/en/wall-tile-count
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.