# Tile Calculator

> Free tile calculator. Enter your area and tile dimensions to find out exactly how many tiles, grout, and adhesive you need with cost estimates.

Canonical: https://renoquant.com/tile-calculator
Prices updated: 2026-03

## At a glance

A 10 m² floor tiled with 30×30 cm tiles needs about 110 tiles after 10% waste, plus roughly 5 kg of grout and 30–40 kg of tile adhesive. Diagonal or herringbone layouts push waste to 15–20%, and large-format tiles (60×60 cm) cut grout-line counts but need a perfectly flat substrate. Material cost in Europe typically runs EUR 15–60 per m² depending on tile grade.

## How to Calculate How Many Tiles You Need

Getting the right number of tiles for your project saves money and avoids delays. Our tile calculator takes the guesswork out of your renovation. If you are considering alternatives to tiles, try our [flooring calculator](/flooring-calculator) for laminate, vinyl, or hardwood options.

### The Tile Calculation Formula

**Tiles needed = (Total Area ÷ Single Tile Area) × (1 + Waste Factor)**

The effective tile area includes the grout joint width on two sides of each tile.

### Step-by-Step Guide

1. **Measure the area** — Record length and width of the surface to be tiled.
2. **Choose your tile size** — Common sizes: 30×30cm, 45×45cm, 60×60cm.
3. **Select grout width** — Standard is 3mm for rectified tiles, 5mm for rustic.
4. **Add waste factor** — 10% minimum, more for complex patterns.

### Materials You'll Need Beyond Tiles

| Material | Quantity per m² | Purpose |
|----------|----------------|---------|
| Tile Adhesive | 3-5 kg | Bonding tiles to surface |
| Grout | 0.3-0.8 kg | Filling joints |
| Waterproofing | 1-2 kg (wet areas) | Moisture barrier |
| Spacers | 50-100 pcs | Maintaining even gaps |

### Choosing the Right Tile Layout

- **Straight lay** — Simplest, least waste (5-10% extra)
- **Diagonal/Diamond** — More visual interest, higher waste (15-20% extra)
- **Herringbone** — Premium look, complex cuts (15-20% extra)
- **Brick/Offset** — Good for rectangular tiles (10-15% extra)

### Tile Material Comparison

Material choice drives both price and where the tile can be used. Porcelain is the most versatile; natural stone is the most demanding.

| Material | Cost (€/m²) | Water Absorption | Best Use | Sealing Needed |
|---------|------------|------------------|----------|----------------|
| Ceramic | 15-30 | High (>3%) | Walls, low-traffic floors | No |
| Porcelain (glazed) | 25-50 | Very low (<0.5%) | Floors, walls, wet areas | No |
| Porcelain (rectified) | 35-70 | Very low | Large-format floors, modern look | No |
| Natural stone (marble) | 50-150 | Variable | Feature walls, low-traffic floors | Yes — every 1-2 years |
| Natural stone (slate / travertine) | 40-90 | High | Floors, outdoor patios | Yes |
| Glass mosaic | 60-150 | None | Splashbacks, accent strips | No |
| Cement tile (encaustic) | 70-130 | Medium | Statement floors | Yes — initial + periodic |

Outdoor floors and shower floors must use porcelain rated R10 or higher (slip resistance) and frost-proof if exposed to freezing.

### Grout, Adhesive, and Backer Board

Materials beyond the tile itself add 20-30% to a typical tiling budget. Get the right type the first time:

| Material | When to Use | Approx Cost |
|---------|-------------|-------------|
| Cement-based adhesive (C1) | Dry interior walls, small tiles | €10-15 / 25 kg |
| Flexible adhesive (C2) | Floors, large tiles, underfloor heat | €15-22 / 25 kg |
| Rapid-set adhesive | Same-day grouting, repairs | €18-28 / 25 kg |
| Cementitious grout | Standard joints (3-10 mm) | €8-15 / 5 kg |
| Epoxy grout | Wet areas, kitchens, stain-prone joints | €25-50 / 5 kg |
| Cement backer board (12 mm) | Wet walls, shower enclosures | €15-25 / sheet (1.2 m²) |
| Decoupling membrane | Substrates that may move (timber, new screed) | €10-15 / m² |

Use C2 flexible adhesive for any floor with underfloor heating — rigid C1 cracks as the substrate expands.

### Layout Patterns and Waste Factors

Pattern complexity changes how many tiles end up cut and discarded. Order accordingly:

| Pattern | Waste Factor | Difficulty | Visual Effect |
|---------|-------------|-----------|--------------|
| Straight grid | 5-10% | Easy | Clean, modern, hides level errors |
| Brick / running bond (50%) | 10-12% | Easy | Traditional, hides minor size variation |
| Brick / 1/3 offset | 10-15% | Moderate | Recommended for planks 60 cm+ |
| Diagonal (diamond) | 15-20% | Moderate | Visual interest, hides crooked walls |
| Herringbone | 15-25% | Hard | Premium look, many cuts |
| Versailles / French | 15-25% | Hard | Mixed sizes, period homes |
| Chevron | 20-30% | Hard | Pre-cut tiles only, expensive |

Large-format tiles (60×60 cm and up) need a perfectly flat substrate (within 3 mm over 2 m) — otherwise "lippage" at corners is unavoidable.

### Common Mistakes to Avoid

- **Not buying enough** — Always order 10% extra minimum. Tile batches can vary in shade.
- **Wrong adhesive** — Use flexible adhesive for floor heating, waterproof for wet areas.
- **Skipping waterproofing** — Essential for bathrooms and kitchens near water.
- **Ignoring tile direction** — Check if tiles have a directional pattern before laying.
- **Forgetting the subfloor** — If you are tiling on a new concrete base, use our [concrete calculator](/concrete-calculator) to get the slab quantity right before you start.
- **Mixing batches mid-room** — Even within the same product, batches vary slightly. Open all boxes first and mix tiles between them as you lay.

### When to Hire a Professional Tiler

Professional tiling is recommended for bathrooms (waterproofing is critical), large-format tiles (60cm+), complex patterns, and heated floors. A skilled tiler ensures waterproof joints and level surfaces. Once the tiling is done, estimate the wall paint above the tiled area with our [paint calculator](/paint-calculator).

## Frequently Asked Questions

### How much waste should I account for when buying tiles?

We recommend a 10% waste factor for standard layouts. For diagonal or herringbone patterns, increase to 15-20%. Complex patterns with lots of cuts require more tiles.

### How do I calculate grout quantity?

Grout quantity depends on tile size and grout width. Our calculator uses approximately 0.5 kg per square meter for standard 3mm grout joints with 30×30cm tiles.

### What size tiles should I choose?

Larger tiles (60×60cm) create a more spacious look with fewer grout lines. Smaller tiles (10×10cm or mosaics) are better for curved surfaces and smaller areas like shower floors.

### How much tile adhesive do I need?

Standard tile adhesive usage is approximately 3 kg per square meter for wall tiles and 4-5 kg for floor tiles. Our calculator provides an estimate based on your tile size.

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Interactive version with calculator: https://renoquant.com/tile-calculator. Figures are estimates; final quotes vary by site conditions, materials, and region.