Use this free tile calculator to find how many floor tiles you need in seconds. Enter your room size in metres or feet, choose a tile size, and the tile calculator rounds up and adds extra for cuts and waste instantly — no sign-up, no account, and no personal information needed. Your numbers are calculated in your browser and are not sent to us.
Contents: Formula · How to use · Examples · Tips · FAQ · Related tools
No sign-up required. This tile calculator works in your browser, so the dimensions you enter are not stored or sent to us. Always buy a few spare tiles for future repairs.
Tile Calculator Formula
This tile calculator divides the room area by the area of one tile, then rounds up to a whole tile, because you cannot buy part of a tile. It then adds your chosen percentage for cuts and waste, and rounds up again.
Room area = Room length × Room width
Tiles needed = Round up ( Room area × (1 + Waste ÷ 100) ÷ Area of one tile )
For example, a room 4 m × 3 m is 12 square metres. A 60 × 60 cm tile covers 0.36 square metres. With 10% extra: 12 × 1.10 ÷ 0.36 = 36.67, which rounds up to 37 tiles. If you enter feet, the tile calculator converts the area to square metres for metric tiles, or to square feet for inch tiles, so the result is correct in either system.
How to Use the Tile Calculator
Measure the length and width of the room, then type them into the first two boxes and choose metres or feet. Choose your tile size from the list, set the extra for cuts and waste (10% is a good default, 15% is safer for diagonal layouts), and tap Calculate Tiles. The tile calculator shows the room area and the total number of tiles to buy.
For rooms that are not perfect rectangles, split the floor into rectangles, work out each part, and add the areas together before using the tile calculator. Measure in the same unit for both sides, and check the tile size on the box, because nominal sizes can differ slightly from the true size.
Tile Calculator Examples
Example 1 — 4 m × 3 m room, 60 × 60 cm tiles, 10% waste. Area 12 sq m; 12 × 1.10 ÷ 0.36 = 36.67, rounded up to 37 tiles.
Example 2 — 5 m × 4 m room, 30 × 30 cm tiles, 10% waste. Area 20 sq m; 20 × 1.10 ÷ 0.09 = 244.44, rounded up to 245 tiles.
Example 3 — 10 ft × 12 ft room, 12 × 12 inch tiles, 10% waste. Area 120 sq ft; 120 × 1.10 ÷ 1 = 132 tiles.
These tile calculator examples show why rounding up matters: a result of 36.67 tiles means 36 tiles would leave part of the floor uncovered.
Tile Calculator Tips
Buy spare tiles from the same batch, because tile shades can vary between batches. Keep at least one full box spare for repairs. For background on tile types and sizes, see Wikipedia’s article on tiles. If your room has alcoves, doorways, or a diagonal pattern, raise the waste percentage to 15% before you buy.
Tile Calculator FAQ
What does a tile calculator do? A tile calculator finds how many tiles you need for a floor from the room size and the tile size, rounded up and including extra for cuts and waste.
Why does the tile calculator round up? Because tiles are sold whole. A result of 36.67 tiles must become 37 tiles, or part of the floor would stay uncovered.
How much extra should I add for waste? 10% is a good default for straight layouts. Use 15% for diagonal layouts, rooms with many corners, or large tiles.
Can I use feet and inches? Yes. Enter the room in feet and choose an inch tile size, and the tile calculator works in square feet. Enter the room in metres for metric tile sizes.
Does the tile calculator include grout? No. Grout joints are small, and the waste allowance covers them in most layouts. For very wide joints, add a little more waste.
How do I work out tiles for a room that is not a rectangle? Split the floor into rectangles, work out each part, and add the areas together before using the tile calculator. Measure in the same unit for both sides, and check the tile size on the box.
Related Tools
Try the Wallpaper Calculator for walls, the Roof Calculator for roofing area, the Percentage Increase Calculator to measure a change, and the Discount Calculator to find a sale price. Return to the PDGPT homepage to browse all free calculators by category.
Sources and Method
Method: this page uses its own Tile Calculator Formula. Room area = Room length × Room width, and Tiles needed = Round up ( Room area × (1 + Waste ÷ 100) ÷ Area of one tile ). The result is rounded up because tiles are sold whole, and the waste allowance covers cuts and, in most layouts, small grout joints. No external source is used for this calculation.
Last updated: October 28, 2026