Square Footage Calculator
Calculate the total square footage of a home or project by adding together the area of up to three rectangular sections, plus an estimated cost.
About the Square Footage Calculator
This calculator adds together the area of multiple rectangular rooms or sections to find a project's total square footage — useful for L-shaped houses, additions, or any space made up of more than one rectangle. Enter up to three sections; leave a section's length or width at zero to skip it.
Formula: Each Section's Area = Length × Width; Total Square Footage = Section 1 + Section 2 + Section 3; Estimated Cost = Total Square Footage × Price per Sq Ft
Break any irregular room or floor plan into simple rectangles first, measure each one, then let this calculator total them. Total square footage is the starting figure behind most other material calculators on this site, from paint and flooring to drywall and insulation, and it's also the standard figure used to compare home sizes for real estate and appraisal purposes. This total is a raw floor-area figure — it doesn't subtract stairwells, closets or other unusable footprint, so adjust it if you need only finished living area.