Practical

Flooring Calculator

Length (m)

Width (m)

Waste %

10% recommended

Cost per m² (£)

What is Flooring Calculator?

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A flooring calculator estimates the number of tiles, planks, or square metres of flooring material needed for a room, including a waste allowance for cuts, breakage, and pattern matching.

Calkulon makes complex calculations simple — built for students and everyday problem-solvers.

How to Flooring Calculator

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1Measure the room length and width to get total area (m² or ft²)
2Add 10% waste allowance for straight-lay patterns, 15% for diagonal or herringbone
3Divide total area by the area of one tile or plank to get unit count
4Calculate total cost by multiplying units × price per unit, plus fitting costs

Worked Examples

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Example 1

Given:Room 4m × 5m = 20m² · 10% waste

Result:22 m² tiles needed

Order at least 22m² to allow for cuts

Example 2

Given:250mm × 1500mm planks, 25m² floor + 10%

Result:73 planks

27.5m² ÷ (0.25×1.5m²) = 73.3

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Pro Tip

Always buy at least 10% extra and keep offcuts — if a tile cracks in future, matching an old batch is nearly impossible. Dye lots change between production runs.

References

›Floor — Wikipedia

Formula-verified for precision

Reviewed October 2026

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Flooring Calculator