Square footage or area, is the size of a lot or the floor space of a building or any other piece of real estate or property.

Square footage of a house matters most in real estate deals where the lender needs to verify that the property is worth what the buyer has agreed to pay.

**Formula to calculate square feet of a house.**

First, we need to consider the shape of the structure or the floor space and make sure that the dimensions are in feet.

If for instance, the structure is rectangular, we will use the formula to calculate the area of a rectangle to find its area.

**Example:**

Suppose you have a circular living room, if its floor has a radius of 4 feet, calculate the area of the floor.

Since its a circular structure, we will use the formula to calculate the area of a circle to find its area.

Thus, the square feet of the house is 100.53ftÂ² .