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Calculate rectangular area, perimeter, and purchase area after a waste allowance you choose.
Results update as you type. No calculate button. All calculations run locally in your browser.
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Bars are scaled to the larger of the two areas. The waste slice is the extra material for cuts and offcuts.
| Waste allowance | Value |
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Same length and width; only the waste allowance changes.
Area = length × width. Perimeter = 2 × (length + width). Purchase area = area × (1 + waste rate).
Length 6 m, width 4 m: area = 6 × 4 = 24 m², perimeter = 2 × (6 + 4) = 20 m. At an 8% waste allowance, waste area = 24 × 0.08 = 1.92 m², so purchase area = 25.92 m² (279 ft²). These are the example defaults above; replace them with your own measurements.
This covers one rectangle only. Split irregular spaces into measured rectangles and add them; verify package coverage and cut-pattern waste for your material (flooring, tiles and wallpaper all waste differently). No price is calculated and no package size is assumed.
Area = length × width; purchase area = area × (1 + waste rate). Perimeter = 2 × (length + width).
Split irregular spaces into measured rectangles and add them. L-shaped rooms are two rectangles, not one averaged rectangle.
Cuts, offcuts, pattern matching and damaged pieces all consume material beyond the exact floor or wall area. The percentage depends on the material and layout.
Perimeter is useful for edging, skirting, trim and border materials, which are bought by length rather than area.
Yes, as long as length and width use the same unit: the area comes out in that unit squared. The breakdown also shows the purchase area in ft² when you enter metres.
No. This calculation runs locally in your browser and the values you enter are not sent to a CalcMintly database.
Results are estimates only and do not constitute professional advice.