A person considering whether or not to buy a plot of land will want to know the exact size of the lot. Once she knows the land plot size in square feet, she will likely want to convert the plot size into acres to compare it to other land plots. The conversion process uses a formula that will take just seconds to calculate. Use a calculator to avoid making any errors.
Things You'll Need
 Calculator
 Measuring tape

Measure the length and width of the land plot in feet if it is square or rectangular. If the area is triangular, you will have to divide it up into a series of right triangles and measure the height and base of each individual right triangle. Then divide the measurement of the base by two.

Multiply the length times the width of rectangular land plots to get the area in square feet. If the area is triangular, multiply the two dimensions measured in Step 1 for each triangular section, and add them all together. For example, if a rectangular plot had a length of 110 feet and a width of 115 feet, the plot would be 12,650 square feet.

Divide the number obtained in Step 2 by 43,560. The number 43,560 is a constant used to convert square feet to acres. Using the example above, 12,650/43,560 would equal a land plot with 0.29 acres.