How do I calculate square footage?

To calculate square footage, multiply length by width in feet. For example, a room that is 12 feet long by 10 feet wide has an area of 12 × 10 = 120 square feet. For non-rectangular rooms, break the space into rectangles, calculate each area, and add them together.

What is the formula for the area of a circle?

The area of a circle is calculated using the formula A = πr², where r is the radius. Pi (π) equals approximately 3.14159. For example, a circle with radius 5 feet has area = 3.14159 × 5² = 78.54 square feet.

How many square feet are in an acre?

One acre equals 43,560 square feet. To convert square feet to acres, divide by 43,560. For example, 10,000 square feet = 10,000 ÷ 43,560 = 0.23 acres.

How do you convert square meters to square feet?

To convert square meters to square feet, multiply by 10.764. For example, 50 square meters = 50 × 10.764 = 538.2 square feet. To convert square feet to square meters, divide by 10.764.

What is the area formula for a triangle?

The area of a triangle is calculated as A = (base × height) ÷ 2. The base can be any side, and the height must be measured perpendicular to that base. For example, a triangle with base 8 feet and height 6 feet has area = (8 × 6) ÷ 2 = 24 square feet.

How do I measure a room for flooring?

Measure the length and width of the room in feet, then multiply to get square footage. For irregular rooms, divide into rectangles, calculate each section, and add them together. Add 10% extra for waste and cuts when ordering flooring materials.

Area Calculator - Square Footage, Square Meters, Acres

How to Calculate Area

Area measurement determines the amount of two-dimensional space enclosed by a shape. Our area calculator supports four common shapes: squares, rectangles, circles, and triangles. Each shape has its own formula and practical applications.

Square Area Formula

Formula: A = s² (where s = side length)

A square has four equal sides. To calculate square area, multiply the side length by itself. For example, a square with 10-foot sides has an area of 10 × 10 = 100 square feet. Squares are common in tile patterns, floor tiles, and property boundaries.

Rectangle Area Formula

Formula: A = l × w (length × width)

Rectangles are the most common shape for rooms, properties, and land parcels. To calculate square footage of a room, measure the length and width in feet and multiply them together. A room measuring 20 feet by 15 feet has an area of 300 square feet.

Circle Area Formula

Formula: A = πr² (where r = radius)

Circles are found in gardens, pools, and roundabouts. Use pi (3.14159) times the radius squared to calculate area. A circular patio with a 10-foot radius has an area of approximately 314.16 square feet.

Triangle Area Formula

Formula: A = (b × h) ÷ 2 (base × height ÷ 2)

Triangles appear in roof sections, gables, and land plots. Multiply the base by the height and divide by two. A triangular garden bed with a 12-foot base and 8-foot height has an area of 48 square feet.

Common Area Conversions

1 square foot = 144 square inches
1 square meter = 10.764 square feet
1 acre = 43,560 square feet
1 hectare = 2.471 acres = 107,639 square feet
1 square yard = 9 square feet
1 square mile = 640 acres

Practical Applications

Area calculations are essential for many projects:

Flooring: Calculate square footage needed for hardwood, tile, or carpet
Painting: Determine wall area to estimate paint quantity
Landscaping: Measure lawn or garden areas for sod, mulch, or seed
Real Estate: Calculate property size in square feet or acres
Construction: Estimate materials like drywall, roofing, or concrete
Agriculture: Measure field sizes for planting or irrigation
Interior Design: Plan room layouts and furniture placement

Measuring Tips

Always measure in the same unit (don't mix feet and inches)
For rooms with alcoves or closets, break into rectangles and add areas
Measure at multiple points and use the average for irregular spaces
Add 5-10% extra when ordering materials to account for waste
For land measurements, professional surveying ensures accuracy
Use a laser measure for quick, accurate room measurements

Why Use Our Area Calculator?

Calculate area for 4 common shapes on one page
Support for multiple input units (inches, feet, centimeters, meters)
Results in square feet, square meters, acres, and hectares
Instant calculations with formula display
100% free with no registration
Complete privacy - all calculations performed locally
Mobile-friendly responsive design
No ads or distractions

Area Calculator

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