📐 Square Footage Calculator
Calculate the area of any room, floor, wall, or outdoor space in square feet, meters, or yards.
Square Footage Formulas
Rectangle / Square: Area = Length × Width
Triangle: Area = (Base × Height) ÷ 2
Circle: Area = π × Radius²
Unit Conversions
- 1 sq ft = 0.0929 sq meters
- 1 sq meter = 10.764 sq ft
- 1 sq yard = 9 sq ft
- 1 acre = 43,560 sq ft
- 1 sq ft = 144 sq inches
Common Room Sizes
| Room Type | Typical Size | Square Footage |
|---|---|---|
| Small Bedroom | 10 × 10 ft | 100 sq ft |
| Average Bedroom | 12 × 12 ft | 144 sq ft |
| Master Bedroom | 14 × 16 ft | 224 sq ft |
| Living Room | 15 × 18 ft | 270 sq ft |
| Kitchen | 10 × 12 ft | 120 sq ft |
| 2-Car Garage | 20 × 20 ft | 400 sq ft |
| Tiny House | 20 × 24 ft | 480 sq ft |
| Average US Home | — | ~2,300 sq ft |
Frequently Asked Questions
How do I calculate square footage of a room?
For a rectangle, multiply length × width in feet. A 12 ft × 15 ft room = 180 sq ft. For irregular shapes, divide into rectangles and add each area together.
How many square feet is a 12×12 room?
A 12×12 room is 144 square feet (12 × 12 = 144). This equals about 13.4 square meters.
How do I convert square feet to square meters?
Multiply square feet × 0.0929. Example: 500 sq ft × 0.0929 = 46.45 sq meters. Or divide by 10.764.
How many square feet are in an acre?
One acre = 43,560 square feet. To convert acres to sq ft, multiply by 43,560.
How do I measure an L-shaped room?
Divide the L-shape into two rectangles, calculate each area, and add them. For example: Section A (10×12 = 120 sq ft) + Section B (8×6 = 48 sq ft) = 168 sq ft total.
When to Use This Calculator
Use this when measuring floor space for flooring, carpet, tile, or paint purchases, listing a home for sale, comparing rental spaces, or calculating HVAC sizing for a room.
Common Mistakes to Avoid
- Measuring to wall centers instead of finished wall surfaces — measure from baseboard to baseboard for accurate usable floor area.
- Forgetting to deduct closets or permanent fixtures — if a closet needs different flooring than the main room, measure it separately.
- Confusing square feet with linear feet — flooring materials are often sold in square feet, but trim and edging are sold in linear feet; these are different units.