30×30 cm Tile Calculator & Layout Planner

Enter your room dimensions in Step 1 to generate a customized 30×30 cm layout with precise cut calculations and carton estimates in Step 2.

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Coverage & Packaging Reference (30 × 30 cm)

Calculated with standard cartons of 11 tiles per box (0.99 m²/box) and 10% cutting allowance.

Room Area (m²)	Net Tiles	Total (+10% Waste)	Boxes to Buy	Purchased Area (m²)
5 m²	56 tiles	62 tiles	6 boxes	5.94 m²
10 m²	112 tiles	124 tiles	12 boxes	11.88 m²
15 m²	167 tiles	184 tiles	17 boxes	16.83 m²
20 m²	223 tiles	246 tiles	23 boxes	22.77 m²
25 m²	278 tiles	306 tiles	28 boxes	27.72 m²
30 m²	334 tiles	368 tiles	34 boxes	33.66 m²

Attic Stock Recommendation: Trade practice recommends ordering 1 extra unopened box (0.99 m²) to protect against future pipe repairs and dye lot color shifts.

Craftsman Trade Advice

Essential technical rules from master tilers for durable tile installations.

Substrate Prep

Tolerant Substrate Adaptability

Compact 30×30 cm tiles conform easily to minor substrate slopes and floor drains without cracking. They are ideal for laundry rooms, utility basements, and compact bathrooms.

Sightline

Center Grid Across Doorway Threshold

Snap perpendicular chalk lines from the room doorway so cut tiles along perimeter walls remain wider than half a tile (15 cm), ensuring a balanced, neat perimeter look.

Joint Physics

3 mm Grout Joints & Perimeter Movement Caulking

Use standard 3 mm grout joints for pressed 30×30 cm tiles to accommodate manufacturing edge bevels. Seal perimeter wall transitions with flexible silicone instead of rigid grout.

Frequently Asked Questions

How many 30×30 cm tiles are in one square meter?

There are exactly 11.11 tiles of 30×30 cm in one square meter without joints. Factoring in a standard 3 mm joint and 10% cutting waste, plan for 12.5 tiles per square meter.

Can 30×30 cm tiles be laid in a 50% brick bond pattern?

Yes, 30×30 cm square tiles can be laid in a 50% brick bond pattern or diagonal pattern. Because square 30 cm tiles have minimal kiln crowning, lippage risk is very low.

What grout joint width should I use for 30×30 cm tiles?

A 3 mm to 4 mm grout joint width is standard for traditional pressed 30×30 cm tiles. Rectified porcelain 30×30 cm tiles can be installed with a narrower 2 mm joint.

Are 30×30 cm tiles suitable for floors or walls?

Yes, 30×30 cm tiles are versatile for both floors and walls. They are especially popular on utility floors, basement laundry rooms, and shower wet room surrounds.

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