How do you calculate square feet of a room?

Measure the length and width of the room in feet, then multiply them together. Square feet equals length times width.

How do I calculate square feet if I measured in inches?

Convert inches to feet by dividing by 12, then add them to the feet measurement before multiplying.

Do closets count in room square footage?

Closets are usually included if they are part of the usable floor area, but standards can vary.

How to Calculate Square Feet of a Room

Calculating the square feet of a room helps when planning flooring, paint, furniture, or renovations. Learn the formula and calculate your room size instantly.

The square footage formula

The basic formula for calculating square feet is:

Square feet = Length × Width

Both measurements should be in feet. If you measure in inches, convert them to feet by dividing by 12.

Step-by-step: measuring a room

Measure the length of the room wall to wall.
Measure the width of the room wall to wall.
Convert any inches to feet.
Multiply length by width.

Example calculation

If a bedroom is 10 feet 6 inches long and 12 feet wide:

10 ft 6 in = 10.5 ft
10.5 × 12 = 126 square feet

Room square footage calculator

Enter the room dimensions below to calculate square footage instantly.

Length

Width

Square feet

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Square metres

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1 square foot = 0.092903 square metres.

Calculating square footage for an entire home?

Measure each room individually and add the totals together. Our room & home calculator does this automatically.

Calculate square footage for multiple rooms →