Question 1

How do I calculate square footage?

Accepted Answer

Multiply length by width, both in feet. A room 12 ft by 10 ft is 120 square feet. For a circle use π × radius²; for a triangle use half the base times the height.

Question 2

How do I calculate square footage of an L-shaped room?

Accepted Answer

Split it into two rectangles, calculate each separately, and add them together. Draw the dividing line where the wall steps in — every L-shape divides into exactly two rectangles.

Question 3

How many square feet are in a square yard?

Accepted Answer

Nine. A square yard is 3 ft by 3 ft. Divide square feet by 9 to get square yards — carpet and some concrete work are priced this way.

Question 4

How do I convert square feet to square metres?

Accepted Answer

Multiply by 0.0929. So 1,000 ft² is about 92.9 m². The calculator shows both figures at once.

Question 5

How many square feet are in an acre?

Accepted Answer

43,560 square feet. A square acre is roughly 209 ft on each side. The calculator shows acres once the area is large enough for the figure to be meaningful.

Question 6

Do I measure square footage from inside or outside the walls?

Accepted Answer

For flooring, paint, and anything you are buying to fill a room, measure inside. ANSI Z765 measures finished living area from the exterior wall face, which is why a listing figure is usually larger than what you will floor.

Question 7

How do I measure a room that is not square?

Accepted Answer

Measure the longest length and widest width to get a rough rectangle, then subtract the missing corners as separate shapes. For a bay window or curved wall, break the curve into a half-circle and add it.

Question 8

Should I add waste to a square footage number?

Accepted Answer

Not to the measurement itself — measure the real area, then add the waste factor the material calls for. Tile and flooring typically want 10%; paint does not need any.

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