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Tile Calculator: How Many Tiles Do You Need?

This free tile calculator tells you how many tiles you need to cover a floor or wall. Enter the room and tile sizes, choose a waste allowance and, if you know it, the number of tiles per box.

By Debmedia Technologies LLP · Kolkata, India · Updated

What Is It and When Do You Need It?

A tile job needs a precise count, because tiles come in boxes and a second batch may not match. The area of the floor divided by the area of a tile is the base, then waste for cuts is added on top.

Enter the size of the area and the tile, a grout gap if you know it, and the tool gives the tiles and boxes to buy.

How to Use This Tool

  1. Enter the length and width of the area in metres.
  2. Enter the tile length and width in centimetres.
  3. Enter the grout gap and the waste allowance.
  4. Press Calculate.

How the Calculation Works

Each tile covers (tile length + gap) × (tile width + gap). The tiles needed = area ÷ that coverage, rounded up. The waste allowance is then added and the total rounded up again. If you enter tiles per box, the number of boxes is the total divided by that, rounded up.

Worked Example

A floor of 4 m by 3 m (12 m²) with 60 cm × 60 cm tiles and a 3 mm gap needs just over 33 tiles, so 34, or 38 with a 10% allowance. At 4 tiles a box, buy 10 boxes (40 tiles).

Common Uses

  • Floors and walls.
  • Bathrooms and kitchens.
  • Comparing tile sizes.
  • Budgeting.

Tips and Common Mistakes

  • Measure the room twice.
  • Buy a few spare tiles for repairs.
  • Check the batch number on every box.

Next, you may need the paint calculator, concrete calculator, area calculator, percentage calculator.

Everything runs in your browser. Nothing you type is uploaded, stored or sent to any outside service.

Frequently Asked Questions

Divide the area of the floor by the area of one tile (including the grout gap) and round up. Then add an allowance for cuts and breakages.
About 10 percent for a straight layout and 15 percent or more for diagonal or patterned layouts. Extra tiles also let you repair later.
Yes. Each tile takes up its size plus the gap, so a wide gap means fewer tiles. For small tiles the effect is larger.
Tiles from different batches can differ slightly in color and size.

Disclaimer: results are calculated in your browser from the numbers you enter. Check important results before you rely on them for money, health, safety or legal decisions.