🔲 Porcelain Tile Calculator

Free tile calculator for porcelain, ceramic and stone: exact quantities, adhesive bags, grout, waste factor and boxes. With 2D/3D visualization.

🪣 How much adhesive and grout?

Already know how many tiles? Now calculate the adhesive and grout you need per m².

📐 How to Calculate Tiles for Your Project

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.

📊 Tile Coverage Reference Table

Tile Size Tiles/m² Adhesive kg/m² Common Use
20×20cm254-5Bathroom walls
30×30cm114-5Walls, backsplash
45×45cm55-6Standard floors
60×60cm2.85-7Living rooms, hallways
80×80cm1.67-9Large 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.

🪨 Natural Stone

Marble, granite, travertine. Unique patterns. Requires wider joints (5-10mm) and sealing. Premium price point.

🎯 Mosaic Tiles

Small format tiles on mesh backing. Perfect for decorative accents, shower floors, and backsplashes. Higher grout consumption.

📋 Quick Reference Calculations

How many 24×24 inch (60×60cm) tiles for 100 sq ft?

28 tiles (with 10% waste). Formula: 9.3m² ÷ (0.6m × 0.6m) × 1.10 = 28 tiles.

How much tile adhesive per square meter?

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%.