Square Footage Calculator
Square Footage Calculator - Room & Floor Area
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Area = Length × Width → 12 × 15 = 180 sq ft
Square Footage Formula
Area (sq ft) = Length (ft) × Width (ft)
To calculate square footage, multiply the length by the width of the space. Both measurements must be in the same unit. If your measurements are in inches, divide the result by 144 to get square feet. If in meters, multiply by 10.764.
Common Room Sizes (Square Feet)
| Room Type | Small | Average | Large |
|---|---|---|---|
| Living Room | 150 sq ft | 250 sq ft | 400+ sq ft |
| Master Bedroom | 100 sq ft | 200 sq ft | 300+ sq ft |
| Secondary Bedroom | 80 sq ft | 130 sq ft | 180 sq ft |
| Kitchen | 70 sq ft | 150 sq ft | 300+ sq ft |
| Bathroom | 35 sq ft | 70 sq ft | 120 sq ft |
| Dining Room | 100 sq ft | 180 sq ft | 250 sq ft |
| Home Office | 50 sq ft | 100 sq ft | 200 sq ft |
| Garage (1-car) | 200 sq ft | 240 sq ft | 280 sq ft |
Unit Conversion Reference
| From | To Square Feet | To Square Meters | To Square Yards |
|---|---|---|---|
| 1 sq ft | 1 sq ft | 0.0929 m² | 0.1111 sq yd |
| 1 m² | 10.764 sq ft | 1 m² | 1.196 sq yd |
| 1 sq yd | 9 sq ft | 0.836 m² | 1 sq yd |
| 1 sq in | 0.00694 sq ft | 0.000645 m² | 0.000772 sq yd |
| 1 acre | 43,560 sq ft | 4,047 m² | 4,840 sq yd |
| 1 sq cm | 0.00108 sq ft | 0.0001 m² | 0.000120 sq yd |
Flooring & Paint Estimator Tips
| Project | Formula | Waste Factor |
|---|---|---|
| Flooring (tiles/wood) | Area ÷ tile sq ft = tiles needed | Add 10–15% for cuts & waste |
| Wall Paint | Wall area ÷ 400 = gallons needed | One gallon ≈ 400 sq ft (1 coat) |
| Carpet | Room sq ft + doorways | Add 10% for seams & cuts |
| Wallpaper | (Perimeter × Wall height) ÷ roll sq ft | Add 15–20% for pattern matching |
| Concrete / Slab | Area × depth (ft) = cubic feet; ÷ 27 = cubic yards | Add 5–10% overage |
Related Calculators
Frequently Asked Questions
Measure length and width in feet, then multiply them. Length × Width = Square Feet. For example, a 12 ft × 15 ft room = 180 sq ft.
Divide the room into rectangles, calculate each area, and add them together. Use the multi-room feature in our calculator to add areas easily.
One acre equals 43,560 square feet.
Multiply square feet by 0.0929. Example: 200 sq ft × 0.0929 = 18.58 sq m.