Area & Volume Calculator
Calculate area, perimeter, volume, and surface area for common 2D and 3D shapes — rectangles, triangles, circles, boxes, cylinders, spheres, cones, and more.
About this calculator
Pick a shape, fill in its dimensions, and the calculator returns area and perimeter (for 2D shapes) or volume and surface area (for 3D shapes) with the formulas and full working shown. Results are rounded to 6 decimals.
Area and volume formulas
Area measures the space inside a 2D shape; perimeter measures the distance around its edge. Volume measures the 3D space a solid occupies; surface area measures the total external surface. Each shape has a specific formula; this calculator applies the standard formulas (rectangle: l×w; circle: πr²; box: lwh; sphere: 4/3·πr³, etc.) and shows every substitution step.