How to Use the Room Area Calculator
Measure your room's length and width in feet, enter them above, and get the total floor area in square feet instantly. This is the standard way area is measured and listed in the US — on apartment listings, flooring quotes, and rug or furniture sizing guides.
Unlike some countries that use units like pyeong, US real estate and home improvement almost always use square feet (ft²). A small bedroom is often around 100-130 ft², a standard living room 150-300 ft², and a one-bedroom apartment typically totals 500-750 ft².
If your room isn't a perfect rectangle — an L-shape, an alcove, or a closet nook — split it into simpler rectangular sections, measure and calculate each one, then add the results together for a close estimate of the total usable area.
Frequently Asked Questions
Multiply the room's length in feet by its width in feet. The result is the area in square feet (ft²).
Split the room into smaller rectangular sections, calculate each area separately, then add them together for a close approximation of the total.