Area Calculator
Whether you are buying flooring, painting a room, laying sod, or quoting a concrete pour, everything starts with one number: area. This calculator handles six common shapes and reports the result in square feet, square meters, square yards, and acres, so you can move straight to ordering materials with the right units.
Shape & Dimensions
Area Formulas by Shape
| Shape | Formula | Example |
|---|---|---|
| Rectangle | length × width | 12 × 14 = 168 ft² |
| Square | side² | 10 × 10 = 100 ft² |
| Circle | π × r² | 3.1416 × 100 = 314 ft² |
| Triangle | ½ × base × height | ½ × 20 × 10 = 100 ft² |
| Trapezoid | ½ × (a + b) × height | ½ × (10+14) × 6 = 72 ft² |
| Parallelogram | base × height | 12 × 8 = 96 ft² |
What You Can Cover With That Area
| Job | Area | Material Needed | Buying Tip |
|---|
Material estimates are typical US values and vary by product, coat, and application. For exact quantities use the linked paint, tile-flooring, carpet, and cubic-yards calculators.
How to Use This Calculator (3 Steps)
Case Study
Frequently Asked Questions
How do I calculate the area of a room?
Measure length and width and multiply. 12 × 14 ft = 168 sq ft. L-shaped rooms: split into two rectangles and add.
How many square feet in a square meter?
10.764. Multiply square meters by 10.764 to get square feet.
How do I convert square feet to acres?
Divide by 43,560. A quarter-acre lot is 10,890 sq ft.
What is the area of a circle?
π × r². A 20-ft-diameter patio (10-ft radius) is about 314 sq ft.
How much paint or flooring do I need?
Paint: 350-400 sq ft per gallon per coat. Flooring: order 10% extra for waste. Use our dedicated calculators for precision.