Square Footage Calculator
Measure a room, a deck or a plot and get its area in square feet and square metres. Pick the shape, type the sides in feet or metres, add a waste percentage for flooring or tiles and your price per square foot to see how much to buy and what it costs.
- Free
- No sign-up
- Runs in your browser
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Result
Type the sizes to see the area.
Areas rounded to two decimals. Measure the floor where the material goes, wall to wall.
How area is calculated
Rectangle
Length × width. A room 12 ft by 15 ft is 180 ft².
Circle, triangle, trapezoid
Circle: π × diameter² ÷ 4. Triangle: base × height ÷ 2. Trapezoid: (side 1 + side 2) ÷ 2 × height. An L-shaped room is two rectangles: calculate each and add them.
Feet and metres
One foot is exactly 0.3048 m, so 1 m² = 10.764 ft². 180 ft² = 16.72 m².
Waste and cost
Flooring and tiles are bought with extra for cuts and breakage. Area × (1 + waste %) is what to buy; × your price per unit is the cost.
Formulas
- Rectangle
- length × width
- Circle
- π × diameter² ÷ 4
- Triangle
- base × height ÷ 2
- Trapezoid
- (side 1 + side 2) ÷ 2 × height
- ft² to m²
- ft² × 0.09290304
- To buy
- area × (1 + waste %)
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- Pick the shape and whether you measured in feet or metres.
- Type the sides (or the diameter).
- Optional: open the last block for several identical rooms, a waste percentage and your price per square unit.
- Read the area in both units, what to buy with waste and the cost. Download the card or copy the result.
Examples
Bedroom 12 ft by 15 ft, laminate at 4.50 per ft²
180 ft² (16.72 m²). With 10% waste, buy 198 ft²: 891.00.
Room 4 m by 3.5 m, tiles at 89.90 per m²
14 m² (150.69 ft²). With 10% waste, 15.4 m²: 1,384.46.
Round rug 3 m across
7.07 m² (76.09 ft²), edge 9.42 m.
Add this tool to your site
Put this tool on your blog, store or club site. It runs inside your page, free, with no account, and a small "by VISU" credit line under it.
Questions
How do I calculate square footage?
Measure length and width in feet and multiply them. 12 × 15 = 180 ft². For other shapes, pick the shape above.
How many square feet are in a square metre?
10.764. One square foot is 0.0929 m².
How much extra flooring should I buy?
Usually 5 to 10% for straight layouts and about 15% for diagonal or herringbone patterns. Type it in Waste.
How do I measure an L-shaped room?
Split it into two rectangles, calculate each one and add the areas.
Is my data saved?
No. Your numbers stay in your browser: nothing is uploaded or saved.