Which formula is used to determine the total number of square feet in a room?

To determine the total number of square feet in a room, the formula we should use is Area (ft2) = length x width.

Measuring the length and width of your area then multiplying those two numbers together to get the area in feet squared (ft2) is the way to calculate a rectangular area. Split it into square or rectangular sections and treat them as two separate areas if you have on oddly shaped area, such as an L-shape. Add them together for your total after calculating the area of each section. You can first convert those values to feet, then multiply them together to get the square footage of the area if your measurements are in different units, say feet and inches.