Add up to 10 rectangles, triangles, circles and trapezoids and get the total area in square feet, metres, yards, acres and hectares.
Square footage is the area of a surface measured in square feet. For a rectangle it is length × width, so a room 12 ft by 10 ft is 120 ft². The page opens on that room plus a triangular nook with a base of 6 ft and a height of 4 ft, which is ½ × 6 × 4 = 12 ft². The total is 132 ft², which is 12.26 m², 14.67 yd², 0.00303 acres and 0.001226 hectares. Each area's working is written in the box How this was worked out, so you can check it against a tape measure. Type the sizes in feet, inches, yards, metres or centimetres. All areas use the same unit.
A rectangle or square is length × width. A triangle is ½ × base × height. A circle is π × (diameter ÷ 2)², so a circle 10 ft across is 78.54 ft². A trapezoid, which has two parallel sides, is ½ × (side a + side b) × height: with sides 6 and 10 and a height of 4 the area is 32. There is no L-shape option. Split an L-shaped room into two rectangles and enter them as two areas: 20 ft by 10 ft plus 8 ft by 6 ft is 200 + 48 = 248 ft². You can add up to 10 areas. A row whose sizes are all empty is skipped.
Tick Subtract on an area to take it away from the total, for a cut-out such as a 3 ft by 2 ft hearth in a 12 ft by 10 ft floor: 120 − 6 = 114 ft². If the areas you subtract are larger than the ones you add, the page shows a message and no total. To price a job, type a price per unit area and choose ft², yd² or m². At 4.50 per ft², 132 ft² costs 594.00. The cost is only the area times your price. It leaves out waste, cuts, tax and delivery, so add those to the price or the area yourself.
Everything is converted through square metres with exact factors: 1 ft² = 0.09290304 m², 1 yd² = 0.83612736 m², 1 acre = 4,046.8564224 m² and 1 hectare = 10,000 m². An acre is therefore 43,560 ft². Areas are shown with up to 2 decimals and acres and hectares with up to 6, so a small room shows a small acre figure. The page measures flat, rectangular and similar plan areas. It does not allow for sloping ground, walls, or the thickness of materials, and a surveyed land area can differ from a sum of simple shapes.
Multiply the length by the width in feet. A room 12 ft by 10 ft is 120 ft². For an L-shaped room, split it into two rectangles, such as 20 ft by 10 ft and 8 ft by 6 ft, and add them: 200 + 48 = 248 ft².
Multiply square feet by 0.09290304. 132 ft² is 132 × 0.09290304 = 12.26 m². Going the other way, divide square metres by 0.09290304. Type the sizes in feet or metres and the page shows both totals.
A triangle is ½ × base × height, so a base of 6 ft and a height of 4 ft is 12 ft². A circle is π × (diameter ÷ 2)², so a 10 ft round rug area is 78.54 ft². Choose the shape for that area and type the sizes.
43,560 square feet, which is 4,046.8564224 square metres. A hectare is 10,000 m², about 2.47 acres. Type a plot in feet, yards or metres and the total is shown in acres and hectares too.
Type the price per unit area and choose ft², yd² or m². At 4.50 per ft² a 132 ft² floor costs 594.00. Add your own allowance for waste and cuts to the area or the price.
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