Square metre calculator
Calculate the area of a rectangular room.
Open calculatorCleverCalc · Guides
Building and renovation: calculate area and materials
Start with area, then calculate material quantities and costs. Find tools for laminate, tiles, paint, concrete and building costs, including a waste allowance you choose yourself.
The right calculatorsHow to get started
- 01
Measure length, width and, where needed, height using consistent units.
- 02
Calculate the base area, then choose the calculator for the actual material.
- 03
Check waste, package sizes and manufacturer coverage before finalising your shopping list.
The right calculators
Laminate flooring calculator
Calculate laminate flooring including waste and pack size.
Open calculatorTile calculator
Calculate tile quantity including waste.
Open calculatorPaint quantity calculator
Calculate litres of paint needed for a wall area.
Open calculatorConcrete volume
Calculate concrete volume for a rectangular slab.
Open calculatorConstruction cost calculator
Estimate construction cost from area and price per m².
Open calculatorA worked example
Building and renovation: calculate area and materials
A rectangular 4.5 × 3.2 m room has 14.4 m² of floor area. Adding a chosen 10% waste allowance gives 15.84 m². With 2.2 m² per pack, eight whole packs are needed. Also check the laying pattern and product instructions.
Frequently asked questions
Is floor area the same as wall area?
No. Walls require wall lengths and height, with any relevant deductions for openings. Area also differs from volume: concrete calculations additionally need thickness or height.
What waste allowance should I use?
It depends on the material, cuts and laying pattern. The example’s 10% is an assumption, not a universal allowance. Use product guidance or a project-specific professional estimate.
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