Calculate how many tiles you need for floors or walls — with pattern waste, grout gaps, box rounding, and cost estimate
Units:
Total area:0
0%
Added on top of pattern waste. Use for complex rooms.
Box & cost settings (optional)
$
—
Results
Enter room dimensions and tile size to see results
About This Tool
Buying too few tiles means a second trip and risking a different dye lot. Buying too many wastes money. This calculator tells you exactly how many tiles you need — accounting for grout gaps, layout pattern, waste factor, and box quantities.
Enter your room dimensions (or add multiple areas), pick a tile size, choose your pattern, and the calculator does the rest. It factors in grout spacing (which adds up over large areas), adds waste percentage based on your pattern choice, and rounds up to full boxes so you know exactly what to buy at the store.
Works for floors, walls, backsplashes, patios — any tiled surface. Supports both metric and imperial measurements.
How to Use
1. Toggle between Metric and Imperial units
2. Enter room length and width (or add multiple areas)
3. Select a tile size or enter custom dimensions
4. Choose a layout pattern (straight, diagonal, brick, or herringbone)
5. Adjust grout gap width and waste percentage
6. Optionally enter price per box and tiles per box for cost estimates
7. See total tiles needed, boxes to buy, and estimated cost
Frequently Asked Questions
How many tiles do I need per square meter / square foot?
It depends on tile size and grout gap. For example, 300×300mm tiles with a 3mm grout gap give about 10.9 tiles per m². 12×12 inch tiles with ⅛ inch grout give about 1 tile per ft². This calculator computes the exact count for any tile size.
How much extra tile should I buy for waste?
For a standard straight layout, add 10% for cuts and breakage. For diagonal (45°) layouts, add 15% due to more cuts at edges. For herringbone patterns, add 15%. For complex rooms with many corners, consider 15–20%. The calculator adjusts waste automatically based on your pattern choice.
Does grout gap size affect how many tiles I need?
Yes. Grout gaps reduce the number of tiles per area. For example, switching from 2mm to 5mm grout on 300×300mm tiles changes coverage from ~10.8 to ~10.5 tiles/m². Over a large area, this adds up. The calculator accounts for grout gaps precisely.
What are common tile sizes?
Common metric sizes: 300×300mm, 600×600mm, 300×600mm, 600×1200mm, 100×100mm (mosaic). Common imperial sizes: 12×12in, 18×18in, 12×24in, 24×24in, 6×6in. This calculator includes presets for all common sizes.
How do I calculate tiles for an L-shaped room?
Split the L-shape into two rectangles and use the 'Add area' button to enter both sections. The calculator sums all areas before computing tile counts.
Should I buy extra tiles even with the waste factor?
The waste factor covers cuts and breakage during installation. It's also wise to keep 2–3 extra tiles stored for future repairs — tiles can crack years later, and matching the exact batch can be impossible. Factor this into your purchase.