Construction

Construction and renovation calculator

Thirteen construction calculations: flooring, paint, bricks, concrete, tiles, skirting, tank, roof, stairs, mortar, renovation estimate, equipment rental and material lists. Waste, joints, mix ratio and consumption per meter are inputs of the calculation itself — each function guide explains its assumptions.

13 functionsConstruction and Renovation

13 functions

Area

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Area with waste

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Total cost

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Fill in the fields and the result appears as you type.

Floors and coverings

Fill in the fields and the result appears as you type.

Width (m)mm

Length (m)mm

Estimated waste (%)optional

Price per m²optional

Result

Fill in the fields and the result appears as you type.

Floors and coverings

Function guide

What it does: Calculates the square metres of floor (or wall covering) a room needs and what the material costs.
What it is for: For ordering flooring before buying: tile, porcelain, laminate and carpet are sold by the square metre and every cut along the walls wastes material.
When to use it: Use it before closing the order at the store. Leave the waste at zero and the number is only the exact room area, which is always less than what the installation consumes.
What to fill in: Room width and length in metres, the waste in percentage and, if you want the cost, the price per square metre.
Formula: Area = width × length. Area with waste = area × (1 + waste ÷ 100). Cost = area with waste × price per square metre.
What each result means: The exact area, the area including waste and the material cost. No box count is assumed here — the figures are square metres.
Worked example: A room of 4 m by 3 m has 12 m². With 10% waste the order is 13.2 m²; at 50 per square metre the material costs 660.

Each calculation's assumptions are in the function guide — no constant stays hidden.

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