Select a shape: Choose the shape that matches your room or area â€" rectangle for standard rooms, L-shape for corner rooms, circle for round spaces, or triangle for attics and angled spaces.
Choose your unit: Select feet, meters, centimeters, or inches from the dropdown menu. All calculations will use your chosen unit.
Enter measurements: Input the length, width, diameter, or other dimensions as required for your selected shape.
Calculate: Click the Calculate button to instantly see the area in multiple unit formats. The result is shown in your input unit plus automatic conversions to other units.
| Unit | Conversion | Common Use |
|---|---|---|
| 1 sq ft (ft²) | 0.0929 m² | US/Canada real estate |
| 1 sq m (m²) | 10.764 ft² | International standard |
| 1 sq cm (cm²) | 0.0001 m² | Small objects |
| 1 sq in (in²) | 6.452 cm² | Screens, small parts |
| 1 acre | 43,560 ft² | US land measurement |
| 1 hectare (ha) | 10,000 m² | Large land areas |
Home Renovation: Calculate flooring, tile, or paint needs by measuring each room's square footage. Add 10-15% extra for waste and cuts.
Real Estate: Verify listed square footage when house hunting. Compare the actual usable area of different properties to make informed decisions.
Furniture Planning: Before buying furniture, measure your room to ensure pieces will fit. For example, a 12ft x 14ft bedroom can comfortably accommodate a queen bed, two nightstands, and a dresser.
Landscaping: Calculate lawn area for fertilizer, seed, or sod. Plan garden beds and patios with accurate area measurements.
Construction: Estimate material quantities for concrete, roofing, siding, and other construction materials based on square footage.
Rectangle: Length × Width. The most common formula for rooms, buildings, and lots.
L-Shape: (A × C) + (B × (C - B)). Divide the L-shape into two rectangles and add their areas.
Circle: π × r² = π × (d/2)². π = 3.14159. For round rooms, gardens, or tables.
Triangle: (Base × Height) ÷ 2. For triangular attics, gardens, or architectural features.
For a rectangular room, measure the length and width and multiply them. For an L-shaped room, divide it into two rectangles and add their areas. For a circular room, measure the diameter and use the formula π × (diameter/2)².
1 square foot = 0.0929 square meters. Multiply sq ft by 0.0929 to get sq m. This calculator shows results in both units automatically.
Gross area includes walls, columns, and shared spaces. Usable area (carpet area) is the actual floor space you can use. In apartments, usable area is typically 70-80% of gross area.
Calculate room area, then add 10-15% for waste and cuts. For example, a 12ft x 10ft room = 120 sq ft. With 10% extra, buy ~132 sq ft of flooring material.
Square footage determines property value, helps compare homes, estimates renovation costs, and affects property taxes. Always verify listed measurements with your own calculations.