Calculate the area of any shape — circle, triangle, rectangle, and more.
Area
50
square units
Formula Used
A = l × w = 10 × 5
Area measures the 2D space enclosed by a shape in square units. Rectangle (l×w) is the base formula from which many others derive. Triangle = half of parallelogram. Circle = π × radius² (π ≈ 3.14159). Complex shapes can be divided into simpler ones and the areas added.
Area = π × r² where r is the radius. Diameter d = 2r, so Area = π × (d/2)². For a circle with radius 5: Area = π × 25 ≈ 78.54 square units.
Area = ½ × base × height. The height must be perpendicular to the chosen base. With three sides (a,b,c): use Heron's formula: Area = √[s(s-a)(s-b)(s-c)] where s=(a+b+c)/2.
Area is measured in square units: mm², cm², m², km², in², ft², yd², acres, hectares. 1 hectare = 10,000 m². 1 acre ≈ 4,047 m². Convert using squared conversion factors: 1 ft² = 144 in² (not 12!).
Calculate the volume of any 3D shape — sphere, cylinder, cone, cube, and more.
Solve any triangle — find area, perimeter, angles, and altitudes from known sides/angles.
Calculate area, circumference, diameter, and radius — enter any one measurement.
Calculate surface area of any 3D shape — sphere, cylinder, cone, and more.