# Tile Calculator

Enter the area to cover, pick a tile size and waste factor to get tiles and boxes required.

- Page: https://jianzhujisuan.com/en/tile-count
- Category: Finishes (https://jianzhujisuan.com/en/c/finishes)
- Chinese version: https://jianzhujisuan.com/zh/tile-count.md
- Data checked: 2026-10-25

## Quick result

With the default inputs (Area to tile 30 m², Tile size 800 × 800 mm, Tiles per box 3 pcs, Layout Typical room (8% waste)): **Tiles required 51 pcs**

## Inputs

| Parameter | Type | Default | Unit | Note |
|---|---|---|---|---|
| Area to tile | number | 30 | m² |  |
| Tile size | select | 800 × 800 mm | — |  |
| Tiles per box | number | 3 | pcs | Printed on the box; 800×800 is usually 3 per box |
| Layout | select | Typical room (8% waste) | — |  |

## Formula

- **Tile area**: A = length × width (convert mm to m)
- **Tiles per m²**: N = 1 ÷ A
- **Net tiles**: N_net = area × N
- **Actual tiles**: N_actual = N_net × (1 + waste %), rounded up
- **Boxes**: boxes = ceil(N_actual ÷ tiles per box)

## Worked example

30 m² with 800×800 tiles: 0.64 m² each, 1.56 per m², 47 net, 51 with 8% waste, and 17 boxes at 3 per box.

## Questions

### What waste factor should I use?

5% for a straight lay in a square room, 8% for a typical room with corners and cut tiles, 12% for diagonal or herringbone patterns, and 15% for small tiles or complicated layouts with many pipes and angles. Waste comes mostly from edge cuts.

### Why keep a spare box?

Tiles are fired in batches and colour varies between them. If a few break later, a replacement order months on will almost certainly be a different batch and visibly different in colour. Keep one unopened box, which many suppliers will take back.

### Can wall tiles and floor tiles be swapped?

Not freely. Floor tiles have low absorption (≤0.5%) and high abrasion resistance, so they can go on walls but are heavy and need tile adhesive plus a keyed substrate. Wall tiles absorb around 10% and are weak enough to crack underfoot. Bathroom floors need slip-resistant tiles with a friction coefficient of at least 0.5.

## Related tools

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Generated by BuildCalc. All calculations run in your browser; no data is uploaded. Formulas follow national standards and common trade practice; local codes govern.