How to Calculate Square Footage of a Room or House

Square footage is essential for buying flooring, ordering paint, estimating heating/cooling needs, or comparing real estate listings. The basic formula is length × width, but real homes have closets, bay windows, and irregular shapes. This guide handles them all.

CalcPlanet – Free Online Calculators

725+ free calculators and 108 tools for math, money, health, and everyday life. Instant results, verified formulas, no sign-up.

· Reviewed against our Editorial Standards and Formula Sources.

CalcPlanet calculators are free, privacy-first, and formula-reviewed.

Editorial Standards · Formula Sources · Privacy · Terms · Contact