An area calculator online computes the area of any common geometric shape - just pick the shape, enter the dimensions, and get the result instantly with the formula shown.
What is Area?
Area is the measure of the two-dimensional space enclosed by a shape, expressed in square units (cm², m², ft², in², etc.). Calculating area is essential for home improvement projects, landscaping, architecture, manufacturing, and everyday math.
Shapes Supported and Their Formulas
Square
Formula: A = side²
A square with 8 cm sides has an area of 64 cm².
Rectangle
Formula: A = length × width
A room 5 m long and 4 m wide has an area of 20 m².
Circle
Formula: A = π × radius²
A circle with radius 7 cm has an area of approximately 153.94 cm².
Triangle
Formula: A = (base × height) / 2
A triangle with base 10 m and height 6 m has an area of 30 m².
Trapezoid
Formula: A = ((base1 + base2) / 2) × height
A trapezoid with parallel sides of 8 m and 12 m and height 5 m has an area of 50 m².
How to Use the Area Calculator
- Open the Area Calculator on UtilWave.
- Select the shape from the dropdown.
- Enter the required dimensions for that shape.
- The area is calculated and displayed instantly.
- The formula used is shown alongside the result.
Real-World Applications
Flooring and tiling - Calculate room area to determine how many tiles or planks to buy (add 10% for waste and cuts).
Painting walls - Find wall area to estimate paint coverage. One gallon of paint covers approximately 350–400 ft² (32–37 m²).
Garden and landscaping - Calculate lawn area for fertilizer or grass seed quantities.
Pool covers and tarps - Find the surface area of a circular or rectangular pool to buy the correct cover size.
Land measurement - Real estate plots measured in square feet, square meters, or acres.
Unit Conversion Tips
The calculator works in any consistent unit - just enter dimensions in the same unit and the result is in square units of that same unit.
- 1 m² = 10,000 cm²
- 1 ft² = 144 in²
- 1 acre = 43,560 ft²
- 1 hectare = 10,000 m²
FAQ
How do I calculate the area of an irregular shape? Divide it into regular shapes (rectangles, triangles), calculate each area, and add them together.
What is the area of a semicircle? Area of semicircle = (π × r²) / 2. Use the circle formula and divide the result by 2.
Can I use the triangle calculator for a right triangle?
Yes - the formula (base × height) / 2 works for all triangles, including right triangles where the height is one of the legs.
How much extra material should I buy for flooring? Add 10–15% to your calculated area to account for cuts, waste, and pattern matching.
Calculate any shape's area with the free Area Calculator.