So, if our property has three bedrooms, two bathrooms and a garage we would search for comparable properties (comps) with the same features. If there is absolutely nothing that sold comparable then you can begin to widen you’re search area and/or widen the time frame sold to 12 months. In the last column you will have a very simple formula that divides sold price by number of square feet. 7) Multiply the average price per square foot by the number of square feet of the subject propertyThe final step! One more simple equation: Average price per square foot multiplied by the number of square feet.