Find the exact area of one or more rooms — get square feet, square meters, square yards, plus flooring or paint quantity and cost.
10% for simple rooms, 15%+ for angles
Check your flooring/tile box label
Leave blank to skip cost estimate
A square footage calculator finds the total floor or surface area of a room, or several rooms combined, so you can buy the right amount of flooring, paint, tile, or carpet — or accurately describe a property's size. Instead of multiplying length by width by hand and converting units manually, you enter your measurements in whatever unit you used (feet, inches, meters, centimeters, or yards) and the tool instantly returns the area in square feet, square meters, and square yards.
This matters because most home improvement materials are priced and sold per square foot, per square yard (carpet), or per box that covers a fixed area (laminate, vinyl plank, tile). Getting the number wrong means either running out mid-project — a real problem when dye lots or batches don't match on a second order — or overspending on material you don't need. It also matters for real estate: listed square footage directly affects a home's perceived value and price per square foot comparisons.
This calculator supports multiple rooms in a single calculation, so an L-shaped room, an open-plan living/dining area, or an entire multi-room flooring project can be broken into simple rectangles, measured separately, and summed into one accurate total — with an optional waste buffer, material coverage, and cost estimate layered on top.
The core formula is simple geometry: area equals length times width for any rectangle. The complexity in real projects comes from mixed units (a room measured in feet but a doorway alcove measured in inches) and irregular shapes, both of which this calculator handles — mixed units by converting everything to feet internally, and irregular shapes by letting you add each rectangular section as a separate "room" that gets summed automatically.
| Room type | Typical size | Square footage |
|---|---|---|
| Small bathroom | 5 ft × 8 ft | 40 sq ft |
| Bedroom | 11 ft × 12 ft | 132 sq ft |
| Master bedroom | 14 ft × 16 ft | 224 sq ft |
| Kitchen | 10 ft × 12 ft | 120 sq ft |
| Living room | 16 ft × 20 ft | 320 sq ft |
| 1-car garage | 12 ft × 22 ft | 264 sq ft |
| 2-car garage | 20 ft × 22 ft | 440 sq ft |
Values are typical/average sizes for reference only. Use the calculator above for your actual room dimensions.
Sam is installing laminate flooring in a 13 ft × 11 ft bedroom. Each box of laminate covers 22 sq ft and costs $58, and Sam wants a 10% waste buffer.
Area: 13 × 11 = 143 sq ft. With 10% buffer: 157.3 sq ft. Boxes needed: 157.3 ÷ 22 = 7.15, rounded up to 8 boxes (covering 176 sq ft). Total material cost: 8 × $58 = $464.
Priya has an open-plan living/dining space shaped like an L. She splits it into two rectangles: the living area is 16 ft × 14 ft, and the dining nook is 8 ft × 9 ft.
Living area: 16 × 14 = 224 sq ft. Dining nook: 8 × 9 = 72 sq ft. Total: 224 + 72 = 296 sq ft. With a 12% waste buffer for the diagonal tile pattern she chose: 296 × 1.12 = 331.5 sq ft, or about 36.8 square yards of material to order.
Anna is retiling a bathroom measured in metric units: 2.4 m × 1.8 m. Tile boxes cover 1.44 m² each (about 15.5 sq ft), and tile costs €32 per box.
Area: 2.4 × 1.8 = 4.32 m², which converts to 46.5 sq ft. With a 15% waste buffer for the small room and cuts around fixtures: 53.5 sq ft, or 4.97 m². Boxes needed: 4.97 ÷ 1.44 = 3.45, rounded up to 4 boxes, costing 4 × €32 = €128.
| Convert from | To square feet | Example |
|---|---|---|
| Square meters | × 10.7639 | 10 m² = 107.6 sq ft |
| Square yards | × 9 | 10 sq yd = 90 sq ft |
| Square inches | ÷ 144 | 1,440 sq in = 10 sq ft |
| Square centimeters | ÷ 929.03 | 92,903 cm² = 100 sq ft |
Multiply the length of the room by its width, both in feet. A room 12 feet long and 10 feet wide is 12 x 10 = 120 square feet. If your measurements are in another unit, convert to feet first, or let this calculator do it automatically.
Split the shape into two or more rectangles, calculate each rectangle's area separately, then add them together. This calculator supports multiple rooms for exactly this purpose.
Divide the square footage by 10.7639. For example, 100 square feet ÷ 10.7639 ≈ 9.29 square meters. To reverse it, multiply square meters by 10.7639.
Divide the square footage by 9, since one square yard equals 9 square feet (3 ft x 3 ft). For example, 270 sq ft ÷ 9 = 30 square yards — useful since carpet is often priced per square yard.
Add 10% for simple rectangular rooms with straight cuts, and 15% or more for rooms with lots of angles, doorways, or diagonal/herringbone patterns.
It varies by product — laminate and vinyl plank boxes commonly cover 18-24 sq ft, tile boxes often 10-15 sq ft. Always check the box label and enter that figure in the calculator's coverage field.
For flooring, paint, or tile, yes — include any area that needs the material. Real estate listings often follow ANSI Z765 standards, which can exclude certain closets or unfinished spaces.
Yes, select meters or centimeters from the unit dropdown. The calculator converts everything internally and shows results in square feet, square meters, and square yards at once.