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Calculators » Construction » Area of irregular shapes

Our online tools will provide quick answers to your calculation and conversion needs. On this page, you can calculate the area of irregular shaped plots of land using measurements taken just with a tape measure.

As illustrated in the figure, a four-sided plot will have two triangular plots (a-d-e and b-c-e). A five-sided plot will have three triangular plots (a-e-f, b-g-f and c-d-g) and so on.

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Calculating areas of irregular polygons is a non-trivial task without sophisticated surveying instruments. One way to calculate areas of such plots, is to break them into a number of triangular-shaped plots as in image shown below and then find the area of each triangle using Heron's formula and sum them up.

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