Square Footage Calculator

Length × width in feet gives square feet: a 14 × 12 ft room is 168 sq ft, which is 18.67 square yards or 15.61 square meters.

Your measurements

Example

Use the unit shown for each box, or type another one: 12 ft 6 in, 150 in, 3.8 m and 600 mm all work, as do the marks on a tape measure.

Area 1

Shape Length (ft) Width (ft) Name This area is Choose “taken away” for a kitchen island, a fireplace hearth or a stair opening that the floor does not cover.

Details Your price per square foot or yard, and the wall height

Your price per square foot ($) Your price per square yard ($) Wall height (ft) For the wall area of rectangles and L-shapes: perimeter × wall height, before doors and windows.

Example: replace these measurements

Your measured area

168 square feet

18.67 square yards · 15.61 square meters · 52 ft of perimeter

Your measured layout

Top view of each area at the same scale. A dashed area is taken away.

Your measured area

168 square feet

Quantities and package details

Bedroom: 168 sq ft
Total area: 168 sq ft
Square yards: 18.67
Square meters: 15.61
Perimeter of the added areas: 52 ft
Wall area at that height, before doors and windows: 416 sq ft

The calculation

Bedroom: 14 × 12 = 168 sq ft
Total: 168 = 168 sq ft
168 ÷ 9 = 18.67 square yards

Not measured yet? Common sizes

A rough starting point, worked out with this calculator. Rectangular rooms, measured wall to wall. Use a row to load its size into the calculator, then change it to your measurements.

Square feet of common room sizes
Room	Square feet	Square yards	Square meters
10 × 10 ft	100	11.11	9.29
10 × 12 ft	120	13.33	11.15
12 × 12 ft	144	16	13.38
12 × 14 ft	168	18.67	15.61
14 × 16 ft	224	24.89	20.81
16 × 20 ft	320	35.56	29.73
20 × 20 ft	400	44.44	37.16

Common questions

How do I work out the square footage of a room?

Multiply the length by the width in feet: a 12 × 14 ft room is 168 square feet. For an L-shaped room, take the whole rectangle and subtract the missing corner, or add the two rectangles it splits into.

How many square feet is a 12 × 12 room?

144 square feet, which is 16 square yards or about 13.4 square meters.

How do I turn square feet into square yards?

Divide by 9, because a square yard is 3 × 3 feet: 144 square feet is 16 square yards. Carpet is often priced by the square yard.

How do I measure a triangle or a round area?

A triangle is half the base times the height, with the height measured square to the base: 10 × 8 ÷ 2 = 40 square feet. A circle is 3.1416 × the diameter squared ÷ 4: a 10 ft circle is about 78.5 square feet.

What counts in a home’s square footage?

Appraisers count finished, heated living space, measured from the outside walls. Garages, basements and open porches are counted separately or left out. Add each floor as its own area here.

How to plan the quantity

Measure each room wall to wall at floor level, in feet. A rectangle is length × width. An L-shaped room is the whole rectangle less its missing corner; a triangle is half the base × the height measured square to it; a circle is 3.1416 × the diameter² ÷ 4.

Add each room as its own area so you can check every one. Anything inside a room the floor will not cover, such as a kitchen island or a hearth, goes in as an area “taken away”.

Carpet is often priced by the square yard (square feet ÷ 9). The perimeter of rectangles and L-shapes is the length of baseboard or edging before doorways are subtracted.

Before you order

This is the measured area, with nothing added for cuts or waste. The flooring, tile and paint calculators add the allowance their materials need.
For a home’s official size, appraisers count finished, heated living space measured from the outside walls; garages, basements and open porches are counted separately or left out.

Before ordering, read the guide: How much flooring do I need? Square feet, boxes and waste. Or choose another calculator.