From Janet Wickell, former About.com Guide

How to Measure and Calculate Residential Square Footage

Step-By-Step

Using Your Measurements to Calculate Square Footage

Squares and Rectangles

Multiply length times width to find the number of square feet in a square or rectangular room. Remember to calculate unfinished areas and deduct them from the total.

To calculate the area of a triangle, multiply its base length by its height and divide that figure by two.

1. Make a Sketch of the Home
2. Measuring Guidelines for Special Circumstances
3. Using Your Measurements to Calculate Square Footage
4. Calculating Combination Shapes
5. Calculating Circular Shapes and Octagons

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