Calculate the area of a room, plot or surface in square feet, yards, meters and acres — for nine common shapes, with an optional cost estimate.
Choose a shape, enter its measurements, and get the area in square feet, yards, meters and more. Add a quantity and a price per unit area for a cost estimate.
| Unit | Area |
|---|
Multiply length by width (both in feet). A room 20 ft × 15 ft is 300 square feet. For circles use π × (diameter ÷ 2)²; for triangles use base × height ÷ 2. Convert other units first: 1 m² ≈ 10.764 sq ft.
The Square Footage Calculator finds the area of a room, plot, floor, wall, lawn or any flat surface that fits a common shape — rectangle, rectangle border, circle, ring, triangle (from three edges or from base and height), trapezoid, sector or parallelogram. Enter the measurements in feet, yards, inches, meters, centimeters, kilometers or miles and the answer appears in square feet, square yards, square inches, square meters, square centimeters and acres.
Add a quantity (for example 12 identical tiles) and an optional price per unit area to see the material cost. For an irregular space, split it into simple shapes, calculate each one and add the areas together. Everything runs in your browser.
To convert the result into other area units such as hectares or acres, use the Units Conversion Calculator.
| Shape | Formula | Example input | Area |
|---|---|---|---|
| Rectangle | length × width | 20 ft × 15 ft | 300 sq ft |
| Rectangle border | length × width − (length − 2b) × (width − 2b) | 20 ft × 10 ft, border 1 ft | 56 sq ft |
| Circle | π × (diameter ÷ 2)² | diameter 10 ft | 78.54 sq ft |
| Ring | π ÷ 4 × (D² − (D − 2b)²) | D = 10 ft, border 2 ft | 50.27 sq ft |
| Triangle (3 edges) | √(s(s−a)(s−b)(s−c)), s = (a+b+c) ÷ 2 | 3 ft, 4 ft, 5 ft | 6 sq ft |
| Triangle (base & height) | base × height ÷ 2 | base 10 ft, height 6 ft | 30 sq ft |
| Trapezoid | (base 1 + base 2) ÷ 2 × height | 10 ft, 6 ft, height 4 ft | 32 sq ft |
| Sector | ½ × radius² × angle (radians) | radius 10 ft, 90° | 78.54 sq ft |
| Parallelogram | base × height | base 8 ft, height 5 ft | 40 sq ft |
Reference values for converting between area units.
| Unit | Equals | Equals | Equals |
|---|---|---|---|
| 1 square foot | 144 square inches | 0.111111 square yards | 0.092903 square meters |
| 1 square yard | 1,296 square inches | 9 square feet | 0.836127 square meters |
| 1 square meter | 1,550.0031 square inches | 10.7639 square feet | 1.19599 square yards |
| 1 acre | 6,272,640 square inches | 43,560 square feet | 4,046.86 square meters |
| 1 hectare | — | 107,639 square feet | 10,000 square meters |
Flooring, tiles, paint and construction are often priced per square foot. Multiply the area by the rate: cost = area × price per sq ft. The rates below are examples only — use quotes from your supplier or contractor.
| Area | Example rate | Estimated cost |
|---|---|---|
| 120 sq ft | ₹45 per sq ft | ₹5,400 |
| 300 sq ft | ₹60 per sq ft | ₹18,000 |
| 850 sq ft | ₹35 per sq ft | ₹29,750 |
| 1500 sq ft | ₹18 per sq ft | ₹27,000 |
Add 5–10% extra for waste, cuts and breakage when ordering tiles, flooring or paint.
For a rectangle, multiply length by width, both in feet. A 20 ft × 15 ft room is 300 square feet. For other shapes, use the matching formula — the calculator applies it for you.
Divide the floor plan into simple shapes such as rectangles and triangles, calculate each area, then add them together. Subtract any area that is cut out, such as a recessed section.
One square yard is 9 square feet, one square meter is about 10.764 square feet, and one acre is 43,560 square feet.
Yes. Choose the length unit — feet, yards, inches, miles, meters, kilometers or centimeters — and the calculator converts everything to square feet and other area units for you.
It multiplies the area of one piece by the number of identical pieces, which is useful for tiles, panels, or several identical rooms.
Enter a price and its unit (per square foot, yard, inch, meter or cm). The cost is the total area in that unit multiplied by the price.
Use π × (diameter ÷ 2)². A circle with a 10 ft diameter has an area of about 78.54 square feet.
It gives the area of a frame-shaped strip around the inside edge of a rectangle — for example a path around a lawn or a tile border around a room.
Carpet area is the usable floor area inside the walls; built-up area adds wall thickness, balconies and similar. This calculator computes geometric area, so measure the portion you need.
Yes. It is free, requires no sign-up, and all calculations run in your browser.
