Tileria

120×30 cm Tile Calculator & Layout Planner

Enter your room dimensions in Step 1 to generate a customized 120×30 cm layout with precise cut calculations and carton estimates in Step 2.

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Coverage & Packaging Reference (120 × 30 cm)

Calculated with standard cartons of 4 tiles per box (1.44 m²/box) and 10% cutting allowance.

Room Area (m²)Net TilesTotal (+10% Waste)Boxes to BuyPurchased Area (m²)
5 m²14 tiles16 tiles4 boxes5.76 m²
10 m²28 tiles31 tiles8 boxes11.52 m²
15 m²42 tiles47 tiles12 boxes17.28 m²
20 m²56 tiles62 tiles16 boxes23.04 m²
25 m²70 tiles77 tiles20 boxes28.8 m²
30 m²84 tiles93 tiles24 boxes34.56 m²
Attic Stock Recommendation: Trade practice recommends ordering 1 extra unopened box (1.44 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

Substrate Planarity & Uncoupling

Long 120 cm ceramic planks have virtually zero flexibility. The subfloor must be exceptionally flat, with no dips exceeding 2 mm over a 2 m span. Over heated screeds, install an uncoupling fleece membrane to prevent substrate contraction cracks from shearing long planks. Always apply flexible S1-rated thin-set using both floor troweling and back-buttering.

Sightline

Alignment & Offset Strategy

Lay long wood planks parallel to the primary light source to disguise subtle joint shadows. Never lay 120 cm planks in a 50% brick bond; use a maximum 25% to 33% stepped running bond or random wood floor offset. Ensure start and end pieces in each run measure at least 25 cm to maintain authentic plank proportions.

Joint Physics

Mechanical Leveling & Movement Joints

High-tension wedge-and-strap leveling systems are essential every 30 cm along 120 cm plank edges to eliminate lippage while mortar sets. In rooms longer than 8 meters, incorporate a flexible movement joint through tiles and screed. Never fill perimeter wall transitions with hard grout; use elastic silicone with backer rod.

Frequently Asked Questions

How many 120×30 cm tiles are in one square meter?
One 120×30 cm plank tile covers 0.36 square meters. Exactly 2.78 plank tiles cover one net square meter. Boxes typically contain 4 planks, yielding 1.44 m² of floor coverage. Multiply your room area by 1.10 (to include a 10% cutting allowance for staggered ends), divide by 1.44 m², and round up to whole cartons.
Can 120×30 cm tiles be laid in a 50% brick bond pattern?
Never lay 120 cm plank tiles with a 50% center-joint overlap. Due to high-temperature kiln firing, long tiles exhibit natural longitudinal camber (crowning) in the center. A 50% offset places the maximum arch of one tile directly next to the lowest end of the next, producing severe lippage. A maximum 33% stepped offset is the trade standard.
What grout joint width should I use for 120×30 cm tiles?
Use a 2 mm joint for rectified porcelain wood-look planks. A 2 mm joint is narrow enough to maintain an authentic hardwood floor visual while providing sufficient room for flexible polymer grout to bond. Avoid hairline joints under 1.5 mm, as seasonal thermal movement can cause edge chipping.
Are 120×30 cm tiles suitable for floors or walls?
120×30 cm porcelain planks are engineered primarily for flooring in living rooms, kitchens, and walk-in bathrooms. They can also be installed on accent walls (such as behind bathtubs or fireplace mantels), provided the wall structure can support the heavy dead load and a non-sag high-tack adhesive is used.

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