Measure the length and width of each room or area in feet
Multiply length by width to get the square footage of each rectangular area
For irregular spaces, divide them into smaller rectangles or triangles, calculate each section, and add them together
Include only finished, livable areas if you are calculating home square footage
Exclude garages, unfinished basements, porches, and other non-livable spaces unless specifically required
Measure from the outside walls if you are calculating the total footprint of the house
Add the square footage of all included rooms and spaces
Round each measurement to the nearest inch or tenth of a foot if needed
Use a tape measure, laser measure, or floor plan for accuracy
Double-check all measurements before finalizing the total