Square Footage Calculator: How Many Square Feet Is My Room?
How to calculate square footage: Multiply length × width in feet. A 12×12 room = 144 sq ft. A 10×10 room = 100 sq ft. For irregular shapes, break the area into rectangles, calculate each one, then add them together. To convert to square yards, divide by 9. To convert to square meters, multiply by 0.0929. Enter your room dimensions below for instant results.
Using the result for a project? Go from room area to material estimates with our carpet calculator, flooring calculator, and paint calculator.
Common room sizes — click to auto-fill:
How to Measure a Room
Measuring square footage is one of the most common calculations for homeowners, real estate agents, and contractors. Follow these steps for accurate measurements:
- Clear the area. Move furniture and obstructions so you can measure wall to wall.
- Measure length and width. Use a tape measure and record dimensions in feet. Include inches as decimals (e.g., 12 feet 6 inches = 12.5 feet).
- Multiply length by width. The result is your area in square feet.
- For irregular rooms: Divide the room into rectangles, calculate each area separately, and add them together.
Measuring Irregular Rooms
Most rooms aren't perfect rectangles. L-shaped rooms, alcoves, and bay windows require you to break the space into simpler shapes:
- L-shaped rooms: Divide into two rectangles, measure each, and add the areas together.
- Rooms with alcoves: Measure the main rectangle, then add the alcove area.
- Rooms with closets: Measure the closet separately and add or exclude as needed.
- Round areas: Use the circle formula (pi x radius squared) for circular or semi-circular spaces.
Square Footage in Real Estate
In real estate, square footage is one of the most important metrics for determining property value. Here are key things to know:
- Gross vs. livable square footage: Gross includes walls and unusable space. Livable (net) square footage is the actual usable area.
- What's included: Most listings include all finished, heated spaces. Garages, unfinished basements, and attics are typically excluded.
- Price per square foot: Divide the home's price by its square footage to compare values across properties. This varies widely by location.
- Verification: Always verify listed square footage with your own measurements or an appraiser, as discrepancies of 5-10% are common.
Price Per Square Foot
To calculate price per square foot, divide the total price by the total square footage. For example, a 1,500 sq ft home listed at $300,000 costs $200 per square foot. This metric is useful for comparing properties of different sizes in the same area.
Average Room Sizes in the US
Not sure if your room is standard? This table shows typical room dimensions for American homes:
| Room Type | Average Size (sq ft) | Typical Dimensions | Notes |
|---|---|---|---|
| Master Bedroom | 200-350 | 14' x 16' | Excluding walk-in closet |
| Standard Bedroom | 120-180 | 11' x 12' | Min code: 70 sq ft |
| Living Room | 250-400 | 16' x 20' | Open-plan may be larger |
| Kitchen | 150-300 | 12' x 16' | Modern trend: 200+ sq ft |
| Full Bathroom | 40-100 | 8' x 10' | Half bath: 20-30 sq ft |
| Dining Room | 150-250 | 12' x 14' | Seats 6-8 people |
| Garage (2-car) | 400-600 | 20' x 24' | Usually excluded from livable sq ft |
| Home Office | 100-200 | 10' x 12' | Growing in new builds |
Square Footage Conversion Chart
Quickly convert between common area units:
| From | To | Multiply By | Example |
|---|---|---|---|
| Square Feet | Square Yards | ÷ 9 | 900 sq ft = 100 sq yd |
| Square Feet | Square Meters | ÷ 10.764 | 500 sq ft = 46.5 sq m |
| Square Feet | Acres | ÷ 43,560 | 10,000 sq ft = 0.23 acres |
| Square Meters | Square Feet | × 10.764 | 50 sq m = 538 sq ft |
| Acres | Square Feet | × 43,560 | 0.5 acres = 21,780 sq ft |
| Square Yards | Square Feet | × 9 | 50 sq yd = 450 sq ft |
Cost Per Square Foot by Home Project (2026)
Knowing your square footage helps you estimate project costs. Here are typical per-square-foot costs for common home improvement projects:
| Project | Cost/Sq Ft | 200 Sq Ft Room | Includes |
|---|---|---|---|
| Interior Paint | $2-$6 | $400-$1,200 | Paint + labor (2 coats) |
| Carpet | $3-$11 | $600-$2,200 | Material + padding + install |
| Hardwood Floor | $6-$18 | $1,200-$3,600 | Material + install + finish |
| Laminate Floor | $3-$8 | $600-$1,600 | Material + underlayment + install |
| Tile Floor | $7-$25 | $1,400-$5,000 | Tile + mortar + grout + labor |
| Drywall | $2-$5 | $400-$1,000 | Material + tape + mud + labor |