Tile Calculator
Opuslay is a free tile calculator that works out how many tiles you need for any room — and, unlike a plain square-metre calculator, it counts them for the exact pattern you plan to lay. Choose a layout, enter your room size in millimetres or metres, and get piece counts plus a waste allowance you can adjust.
Explore Tile Patterns
The tiles below are our featured layouts — the full catalogue holds 148.
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Save this to your moodboard, or send yourself the link — it reopens the calculator with your room.
How the tile calculator works
Enter your room's width and length, pick the tile pattern and sizes you want, and Opuslay works out the number of tiles the layout requires — including the extra pieces needed where the pattern meets the walls. Results are shown in pieces and total area (m²), so they stay accurate whatever box or pack size your merchant uses. Whether you use it as a floor tile calculator for a whole room or for a small splashback, the method is the same.
You can switch between metric and imperial at any time: the same layout is available in metric-native sizes (millimetres) and US nominal sizes (inches).
How many tiles do I need?
The short answer: measure your room in square metres, then divide that by the area of one tile and add a margin for cuts and breakage. To work out the square metres for tiling, multiply the room's width by its length in metres — Opuslay does this for you when you enter your dimensions, then turns that floor area into a piece count for your chosen layout. The margin is where a pattern matters: a simple grid wastes little, while an angled or multi-size layout needs more. Opuslay applies a sensible default waste allowance per pattern and lets you override it.
A common starting point is 10% waste for straight layouts and 10–15% for diagonal or multi-size patterns such as the French pattern or herringbone.
Why the pattern changes your tile count
Two rooms of the same size can need different quantities depending on the layout. A metro running bond repeats cleanly and cuts little; a herringbone or the Opus Roman pattern creates more edge cuts and needs a larger allowance. Opuslay calculates each layout on its real geometry rather than a flat percentage, so the estimate follows the pattern you actually chose.
Browse the full library below, or start from a common format such as 600x600 tile or 300x600 tile and adjust from there.
Frequently Asked Questions
How do I calculate how many tiles I need?
Divide your room area by the area of a single tile, then add a waste allowance for cuts and breakage. Opuslay does this automatically for your chosen pattern and lets you adjust the waste percentage.
How do I work out the square metres for tiling?
Measure the room's width and length in metres and multiply them to get the area in m²; for an irregular room, split it into rectangles, work out each one, and add the areas together. Enter those dimensions into Opuslay and it converts the floor area into a piece count for your chosen tile size and pattern.
Is the Opuslay tile calculator free?
Yes. The tile calculator and the full pattern library are free to use, with no sign-up required.
Does it work in both millimetres and inches?
Yes. You can enter room dimensions and tile sizes in metric (millimetres, metres) or imperial (inches, feet), and switch units at any time.
How much extra tile should I buy?
Plan on about 10% extra for straight layouts and 10–15% extra for diagonal or multi-size patterns, to cover cuts and breakage. Rooms with many corners or obstacles may need a little more, and it's worth keeping a few spare tiles from the same batch for future repairs.
Does the tile pattern change how many tiles I need?
Yes. Patterns with more edge cuts — diagonals, herringbone, or multi-size layouts like the French pattern — need more tiles than a simple grid of the same area.