Formula
How this estimate works
room square feet = room length x room width
A 14 ft by 12 ft room is 168 square feet.
Measure a rectangular room
For a rectangular room, multiply length by width. For irregular rooms, split the floor plan into multiple rectangles and add them together.
Use room area for materials
Room square footage is often the first number needed for flooring, rugs, paint planning, insulation, and renovation budgets.
Assumptions used
- Each shape can be multiplied by quantity.
- Square yards are calculated by dividing square feet by 9.
- Square meters are converted from square feet for planning.
Before you order materials
- Measure at the longest usable length and width.
- Split irregular rooms into multiple rectangles.
- Add material waste separately.
Frequently asked questions
How do I calculate square feet of a room?
Multiply room length by room width in feet. For example, a 14 ft by 12 ft room is 168 square feet before adding waste for materials.
What if the room is not rectangular?
Break it into simple shapes, calculate each area, and add them together.
Should I add waste for flooring?
Flooring orders often include waste for cuts and layout, but the waste percentage depends on material and pattern.