Square Footage Calculator
Calculate the area of any space in square feet, square meters, square yards, or acres. Choose your shape and enter dimensions to get instant results.
Area Formulas by Shape
Rectangle
Circle
Triangle
Trapezoid
How to Measure Square Footage
Measuring square footage is something you'll need for a ton of practical projects: buying flooring, painting walls, planning a garden, or figuring out how much rent should cost. The good news is that it's straightforward once you know the shape you're working with.
For most rooms, you just need a tape measure and a few minutes. Measure the length and width in feet, multiply them together, and you've got your square footage. For odd-shaped spaces, break them into smaller rectangles, calculate each one, then add them up.
4 Shape Options
Calculate area for rectangles, circles, triangles, and trapezoids
Auto Unit Conversion
Instantly see results in sq ft, sq m, sq yards, and acres
Home Projects
Perfect for flooring, painting, landscaping, and more
Common Room and Space Sizes
Knowing typical room sizes helps you double-check your measurements and plan projects more accurately.
| Room/Space | Typical Size (ft) | Square Footage | Notes |
|---|---|---|---|
| Single Bedroom | 10 × 10 | 100 sq ft | Fits a bed and small dresser |
| Master Bedroom | 14 × 16 | 224 sq ft | Fits king bed and furniture |
| Living Room | 16 × 20 | 320 sq ft | Average for mid-size homes |
| 1-Car Garage | 12 × 20 | 240 sq ft | Tight fit for larger vehicles |
| 2-Car Garage | 20 × 20 | 400 sq ft | Standard size |
| Studio Apartment | 20 × 25 | 500 sq ft | Typical studio in a city |
Measurement Tips for Accurate Results
Measure Twice
It's the oldest advice for a reason. Measure each dimension at least twice and use the average if they differ slightly.
Measure at Floor Level
Walls aren't always perfectly straight. For flooring projects, measure along the floor rather than at waist height for the most accurate number.
Break Up Odd Shapes
L-shaped rooms or irregular spaces? Divide them into rectangles, calculate each section separately, then add the areas together.
Add 10% for Waste
When buying materials like flooring or tile, always add about 10% extra to account for cuts, mistakes, and pattern matching.
Frequently Asked Questions
How do I calculate square footage of a room that isn't a perfect rectangle?
Break the room into smaller rectangles or triangles. Measure each section separately, calculate the area of each, then add them all together. For L-shaped rooms, divide into two rectangles. For rooms with angled walls, use the triangle formula for the angled portion.
What's the difference between square feet and linear feet?
Linear feet measures length in one direction only (like the length of a wall). Square feet measures area (length times width). When buying baseboard trim, you'd use linear feet. When buying floor tiles, you'd use square feet.
How do I convert square feet to square meters?
Divide the square footage by 10.764 to get square meters. For example, 200 sq ft divided by 10.764 equals about 18.58 square meters. This calculator does this conversion automatically for you.
How many square feet are in an acre?
One acre contains 43,560 square feet. To put that in perspective, an acre is roughly the size of a football field without the end zones (which is 48,000 sq ft). A quarter-acre lot, common in suburbs, is about 10,890 square feet.
Do I include closets when measuring a room's square footage?
It depends on the purpose. For real estate listings, closets are usually included in the room's square footage if they have a standard ceiling height. For flooring projects, measure the closet separately since you'll need material for that floor too. Always measure what you actually plan to cover.
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