Square Footage Calculator
Calculate area of rectangles, triangles, circles, trapezoids and more in sq ft, metres and yards, with quantity and cost estimates.
Number of identical areas — e.g. 2 for two same-size bedrooms.
Optional — shows total cost for the combined area.
Area
200 ft²
200 ft² per area
Square metres
18.6 m²
Square yards
22.2 yd²
Acres
0.0046
Square inches
28,800
Estimated cost
₹20,000
200 ft² × ₹100
For irregular rooms, split into rectangles and add the results. Cost is the material estimate at the price per square foot; labour and wastage are extra.
How it works
Rectangle: L × W. Triangle: ½ × b × h. Circle: π × r². 1 m² = 10.764 ft².
Example: 20 ft × 10 ft room = 200 ft² ≈ 18.6 m².
Last updated: August 2026
How this calculator is verified
Checked by True Calculator automated test suite on
- Formula verified against a published worked example in the automated test suite
- Edge cases (zero, negative, boundary and unit-mismatch inputs) covered by unit tests
The full verification method is on our how we verify page. Found an error? Tell us and we will re-check it.
When to Use This Calculator
Square footage is the base number for most home work in India: flooring, carpet, painting, false ceiling and tarpaulin quotes are all priced per square foot. This calculator turns room measurements into square feet, square metres and square yards, so you can compare a contractor's per-square-foot rate against a dealer's per-square-metre tile price without unit confusion. It serves flat owners measuring rooms before buying marble or tiles, landlords computing carpet area for a rental ad, and painters estimating wall area from floor area. The triangle mode handles garden plots and sloped corners, and the circle mode covers circular rooms or stages. Because Indian property listings mix square feet, square metres and square yards, the multi-unit output settles arguments about actual size before any money changes hands.
How to Use This Calculator
- Step 1: Measure the length and width of the room in feet, or in metres if you prefer metric output.
- Step 2: Choose the shape — rectangle for most rooms, triangle for sloped areas, circle for round structures.
- Step 3: Enter the measurements for the chosen shape and read the calculated area.
- Step 4: Read the area in square feet, square metres and square yards, then use it for your material estimate.
Worked Example
Measure a bedroom that is 12 feet by 10 feet and enter both numbers. The tool returns 120 square feet, about 11.15 square metres, in under a second. If a garden plot is triangular with a 20-foot base and 10-foot height, use the triangle mode for 100 square feet. For flooring, order about 10 percent extra tiles to cover cutting and breakage. For painting, measure the wall height and subtract doors and windows before you buy, since paint coverage is quoted per square foot.
Tips and Common Mistakes
- •Tip 1: Measure in one unit only — mixing feet and metres inflates or shrinks the area silently by a factor of about 10.76.
- •Tip 2: For irregular rooms, split them into rectangles and add the areas, rather than estimating a single length and width.
- •Tip 3: When buying tiles, convert to the tile size: a 120 sq ft room with 1 ft by 1 ft tiles needs about 120 tiles plus wastage.
- ✗Mistake 1: Measuring at the floor but assuming the area equals the wall surface — wall painting needs perimeter times height instead.
- ✗Mistake 2: Forgetting the wastage allowance on flooring; cutting around corners and doorways typically consumes 5 to 10 percent extra.
Frequently Asked Questions
How do I calculate the area of a room?
Multiply length by width. A 20 ft × 10 ft bedroom is 200 square feet, about 18.6 square metres.
How many square feet is a square metre?
One square metre is 10.764 square feet. A 100 m² apartment is about 1,076 ft².
What is the area of a circle?
π × radius². A circular gazebo with a 5 ft radius covers about 78.5 square feet.
How much flooring or paint should I buy?
Multiply the room's square footage by the number of coats for walls, or add about 10% waste for flooring. A 200 ft² room needs roughly 220 ft² of tiles.
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