Enter room dimensions (meters) and tile dimensions (centimeters). Optionally add a waste percentage (cuts/breakage). The tool estimates required tiles and rounds up to the next whole tile.
How to estimate tiles (m²) and waste
When planning a floor or wall renovation, one of the first questions is: how many tiles do I need? Ordering too few tiles can delay a project (and you may not find the exact same batch later), while ordering too many increases cost and storage. This tile calculator provides a quick estimate based on surface area: it computes the room area in square meters and divides it by the area of one tile (converted from centimeters to meters). Because you can’t buy fractions of a tile, the result is rounded up to the next whole tile.
The most important practical adjustment is waste. Waste covers cuts, offcuts, breakage, and the inevitable losses that happen when you tile around corners, door frames, pipes, or transitions. A common rule of thumb is 5–10% waste for simple rectangular rooms and straight patterns. For diagonal layouts, herringbone, small rooms with many edges, or complex cuts, it’s safer to use 10–15% (or more). This tool applies the waste percentage to the “no-waste” quantity and then rounds up.
Units matter: room dimensions are entered in meters while tile sizes are entered in centimeters. The calculator converts tile size to meters automatically before computing areas. If tiles are sold by the box, you can still use this tool: compute the number of tiles, then divide by the number of tiles per box and round up to the next box.
Privacy is a key principle of Universe Tools: all calculations run 100% locally in your browser. No data is uploaded, stored, or shared.
Tip: consider adding extra waste if you want to keep spare tiles for future repairs.
What is this tool for?
This calculator estimates how many tiles you should buy for a rectangular surface (floor or wall), based on the room size (m), tile size (cm), and an optional waste percentage for cuts and breakage. The final quantity is rounded up to a whole tile.
Concrete examples
- Bathroom floor: 2.40 m × 1.80 m with 60 × 60 cm tiles → estimate tiles + waste.
- Kitchen backsplash: small surface with many cuts → use a higher waste percentage.
- Rectangular room: simple layout → 5–10% waste is often used as a baseline.
- Buying by the box: compute tiles needed, then divide by tiles per box and round up to boxes.
Common mistakes
- Mixing units: room size is in meters, tile size is in centimeters.
- Entering the tile size as “mm” by accident (e.g. 600 instead of 60).
- Using 0% waste even when the room has corners, pipes, door frames, or diagonal patterns.
- Forgetting to add extra tiles for future repairs (same batch/color may be unavailable later).
Limitations
This is an area-based estimate. It does not simulate the real tile layout (pattern, orientation, grout joints, exact cut geometry). Complex patterns (diagonal, herringbone), narrow rooms, or many obstacles usually require more waste than a simple rectangle.
Educational summary
The tool computes the room area (m²), computes one tile area (m²), divides to get a base tile count, then applies waste: tiles × (1 + waste%/100), and finally rounds up to a whole tile.