Tile Calculator — Tiles Needed & Cost

Calculate how many tiles you need for walls or floors. Accounts for grout gaps and wastage.

Last updated: April 2026 · Source: GOV.UK — Building Regulations Approved Document C

Tiles Needed

44

Boxes (10/box)

5

Total Area

7.2 m²

Disclaimer

This calculator is provided for informational purposes only and should not be considered as financial or tax advice. All calculations are performed locally in your browser — no personal data is collected or sent to our servers. Rates and thresholds are sourced from HMRC and GOV.UK and are updated for the current tax year. Always verify results with HMRC or consult a qualified professional before making financial decisions.

How It Works

To calculate tiles needed, divide the total area to be tiled by the area of a single tile. Common UK tile sizes include 300 × 300 mm (0.09 m²), 600 × 300 mm (0.18 m²) and 600 × 600 mm (0.36 m²). Always add 10% for cuts and breakage — increase to 15% for diagonal layouts or complex patterns.

For wall tiling, measure each wall separately and subtract windows or other openings. For floor tiling, measure the room at its longest and widest points (including any alcoves). The calculator handles rectangular, L-shaped and irregular rooms by letting you split the area into sections.

Enter your room dimensions, tile size and layout pattern. The calculator shows the number of tiles, boxes (tiles are typically sold in boxes covering 1–1.5 m²) and estimated cost. It also estimates adhesive and grout: roughly 2–3 kg of adhesive per m² for wall tiles and 3–5 kg per m² for large floor tiles.

Example: Bathroom floor 2.5 m × 1.8 m, 300 × 300 mm tiles

  1. Floor area: 2.5 × 1.8 = 4.5 m²
  2. Add 10% wastage: 4.95 m²
  3. Tiles per m²: 1 ÷ 0.09 = 11.1 tiles
  4. Total tiles: 4.95 × 11.1 = 55 tiles
  5. Adhesive: ~15 kg; Grout: ~2 kg

Source: GOV.UK — Building Regulations Approved Document C

Frequently Asked Questions

What does the Tile Calculator — Tiles Needed & Cost do?
Calculate how many tiles you need for walls or floors. Accounts for grout gaps and wastage. All calculations are performed in your browser using official UK rates and thresholds.
Does this include waste allowance?
Yes. Most building material calculations include a standard 10% waste allowance. You can adjust this figure depending on the complexity of your project and cutting requirements.
Are prices accurate?
Material prices are indicative estimates based on average UK prices. Actual costs vary by region, supplier, brand and current market conditions. Always get quotes from local suppliers.