Free calculators and unit converters for general and everyday use.
Our online tools will provide quick answers to your calculation and conversion needs. On this page, you can calculate area of irregular shaped plots of land using measurements taken just with a tape measure.
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.
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.
If you have the measurements, you can proceed with the calculation by entering the side lengths of each triangular division of the lot (Note: Use the same unit e.g., m, ft, yd for all the sides).