Free tile calculator for porcelain, ceramic and stone: exact quantities, adhesive bags, grout, waste factor and boxes. With 2D/3D visualization.
Quick answer
How do I calculate how many tiles I need?
Divide your surface area by the tile area, then add 10-15% for waste and cuts. For a 12m² room with 60×60cm tiles: 12 ÷ 0.36 = 34 tiles + 10% waste = 38 tiles needed.
Accurate tile calculation prevents costly over-purchasing and frustrating shortages. This professional calculator accounts for surface area, tile dimensions, joint width, installation pattern, and waste factor to give you precise material quantities for any tiling project.
🔲 Tile Calculation
Tiles per row = Surface width ÷ (Tile width + Joint). Total tiles = Rows × Columns. Add waste factor (10-15%) for cuts and breakage.
🧴 Adhesive Estimation
Consumption scales with tile size: 3.5 kg/m² (≤30cm, 6mm trowel), 5 kg/m² (≤45cm, 8mm), 7 kg/m² (60×60, 10mm) and 9 kg/m² (>60cm, 12mm with mandatory double-buttering).
🎨 Grout Calculation
Grout volume depends on tile size, joint width, and tile thickness. The formula accounts for the cross-section of grout joints across the entire surface.
♻️ Waste Factor
Straight layout: +10%. Brick/offset: +12%. Diagonal: +15%. Complex rooms with many cuts may need up to 20% extra.
Advertisement
📊 Tile Coverage Reference Table
Tile Size
Tiles/m²
Adhesive kg/m²
Common Use
20×20cm
25
4-5
Bathroom walls
30×30cm
11
4-5
Walls, backsplash
45×45cm
5
5-6
Standard floors
60×60cm
2.8
5-7
Living rooms, hallways
80×80cm
1.6
7-9
Large format, commercial
📖 Types of Tiles and Where to Use Them
🏺 Ceramic Tiles
Most affordable option. Best for walls and low-traffic areas. Water absorption: 3-6%. Available in many colors and sizes.
💎 Porcelain Tiles
Denser and more durable. Water absorption: <0.5%. Ideal for floors, outdoor areas, and commercial spaces. Higher cost but longer lasting.
It depends on tile size: ~3.5 kg/m² up to 30cm, ~5 kg/m² up to 45cm, ~7 kg/m² for 60×60, and ~9 kg/m² above 60cm (double-buttering required). The calculator adjusts this automatically.
How many corrugated roofing sheets for 300 sq ft?
With standard 3.6m × 0.85m sheets (useful area ~2.7m² with overlaps): approximately 12 sheets for 28m².
📐 Worked example: a 4.0 × 3.0 m floor in 60×60 porcelain
Floor area = 4.0 m × 3.0 m = 12 m². One 60×60 tile covers 0.6 × 0.6 = 0.36 m².
Tiles needed = 12 ÷ 0.36 = 33.3, so 34 tiles. Add 10% waste for cuts: 34 × 1.10 = 37.4 → buy 38 tiles (so spares come from the same shade batch).
Adhesive at ~5 kg/m² with a 10 mm notched trowel = 12 × 5 = 60 kg → three 25 kg bags. Grout at ~0.5 kg/m² for a 2 mm joint = 12 × 0.5 = 6 kg → two 5 kg bags. Order one extra tile box to keep a long-term repair reserve.
⚠️ Common mistakes laying porcelain tile
Buying tiles from different batches: shade and caliber drift between production lots, so cuts and infills can look mismatched. Order all boxes at once and keep the same batch number.
Using C1 adhesive on large format: 60×60 and 60×120 need a flexible C2 cement adhesive, not basic C1, or tiles debond under load.
Skipping back-buttering: on tiles ≥60 cm, troweling only the floor leaves voids; double-spread to reach ~90% coverage and avoid hollow spots that crack.
Wrong trowel size: a 6 mm notch starves big tiles. Use 10–12 mm for 60×60 and larger.
No movement joints: omitting perimeter and field expansion joints causes tenting on big floors.
🛒 Which tile size and adhesive to choose
30×30: easiest for DIY and small bathrooms or steps; more grout lines, but cuts are forgiving on uneven walls. A 6–8 mm trowel and C1 adhesive are usually enough.
60×60: the default living-area and commercial floor. Fewer joints, cleaner look, but it needs a flat substrate (≤3 mm under a 2 m straightedge), C2 flexible adhesive and a 10 mm trowel.
60×120 large format: premium, seamless rooms, but unforgiving. Use C2 S1 adhesive, a 12 mm trowel or half-trowel, back-buttering and a leveling-clip system. For outdoor or wet floors pick R10–R11 slip rating and rectified edges for tight 2 mm joints.
❓ Frequently Asked Questions about Tile Calculation
How do I calculate how many tiles I need?
Divide your surface area by the tile area, then add 10-15% for waste and cuts. For a 12m² room with 60×60cm tiles: 12 ÷ 0.36 = 34 tiles + 10% waste = 38 tiles needed.
How much adhesive do I need per square meter?
Standard notched trowel application uses about 5 kg/m². Larger tiles (>60cm) may require 6-8 kg/m² with a larger trowel.
What is the standard grout joint width?
For floor tiles: 3-5mm. For wall tiles: 1.5-3mm. For natural stone: 5-10mm. Wider joints provide better waterproofing.
What percentage should I add for tile waste?
Add 10% for straight patterns, 12% for brick/offset, and 15% for diagonal installations. Complex rooms with many angles may need up to 20%.