Tile Calculator
Tile boxes and waste percentage for ceramic or porcelain floors.
OpenLaminate Flooring Calculator
Calculate how many boxes of laminate, hardwood or vinyl plank flooring you need — with waste allowance included.
What this calculates
Calculates the net room area, area with waste allowance and total number of boxes needed for laminate, engineered hardwood, luxury vinyl plank (LVP) or any click-lock flooring system.
Formula used
Area = length × width. Area with waste = area × (1 + waste %). Boxes = area with waste ÷ m² per box (rounded up).
Worked example
A room of 4 m × 3 m = 12 m². With 10% waste: 13.2 m². If each box covers 2.2 m², you need 6 boxes (ceil(13.2 / 2.2) = 6).
Waste by installation type
Straight lay: 10%. Diagonal (45°): 15%. Herringbone pattern: 15–20%. Rooms with many doorways or alcoves: add 2–5% extra. Always buy from the same production batch.
When not to use this calculator
For L-shaped or highly irregular rooms, divide the space into rectangles and calculate each separately, then sum the boxes.
How to use this calculator
- Enter the room length and width in meters (or switch to feet with the imperial toggle).
- Enter the m² per box — this is printed on the product box and typically ranges from 1.8 to 2.5 m².
- Set the waste factor — 10% for straight lay, 15% for diagonal or herringbone.
- Click "Calculate" to get the number of boxes. Results also show total area with waste, useful when comparing different box sizes.
Laminate, LVP, SPC and hardwood — key differences
This calculator works for any click-lock flooring. Understanding the differences helps you choose the right product and estimate accurately:
- Laminate (HDF core): Most affordable. Realistic wood/stone appearance. Not waterproof — moisture at joints causes swelling. Typical thickness: 7–12 mm. Do not use in bathrooms.
- LVP (Luxury Vinyl Plank, WPC core): Waterproof, softer underfoot, warmer than laminate. Good for bathrooms and kitchens. 4–8 mm thick.
- SPC (Stone Polymer Composite): Fully rigid and waterproof. Denser and more dimensionally stable than LVP — better over radiant heat. 3.5–7 mm thick.
- Engineered hardwood: Real wood veneer over plywood. More stable than solid hardwood, can be installed over in-floor heat with caution. Refaceable 1–2 times.
Installation requirements
Regardless of product type, these pre-installation steps prevent most flooring failures:
- Acclimatization: Leave boxes unopened in the room for 48 hours minimum. Wood-core products (laminate, engineered) expand and contract with humidity — installing without acclimation causes buckling.
- Subfloor flatness: Maximum 3 mm per 1.8 m (the standard tolerance). High spots cause hollow spots and joint separation. Grind or self-level as needed.
- Expansion gaps: Leave 10–12 mm at all walls and fixed objects. Cover with baseboard or quarter-round trim.
- Moisture testing: Concrete subfloors should be ≤ 3% moisture content (ASTM F2170) for most floating floors.
Frequently asked questions
How many boxes of laminate do I need?
Area × (1 + waste%) ÷ m² per box, rounded up. Check the box label for exact coverage.
What waste percentage should I use?
10% for straight lay, 15% for diagonal. Add more for complex room shapes.
How many m² per box?
Typically 1.8–2.5 m². Check the product label for the exact figure and enter it above.
Does laminate need underlay?
Yes. Most click-lock flooring requires a foam or cork underlay. Some products have it pre-attached — check the installation guide.
Assumptions
- Boxes are rounded up to the nearest whole box.
- Waste is applied to the net floor area.
- Does not include underlay, adhesive or transition strips.
- Valid for simple rectangular rooms.
Technical note
Always let laminate flooring acclimate in the room for 48 hours before installation. Maintain a 10–12 mm expansion gap around the perimeter.
Common mistakes
- Buying boxes from different production lots (color mismatch).
- Not allowing for acclimatization before installation.
- Forgetting expansion gaps at walls and door frames.
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