Build shapes and watch the numbers move. Drag the corners of a 2D shape — a triangle, rectangle, circle or regular polygon — and its area, perimeter and angles update live. Or switch to 3D and rotate a cube, sphere, cylinder, cone or pyramid while sliders set its size, with surface area and volume shown as you go.
Pick a shape, drag it into the size you want, and read the live measurements — no numbers to type unless you want exact values.
Switch between 2D shapes and 3D solids, then pick a shape from the menu — triangle, circle and regular polygon in 2D; cube, sphere, cylinder, cone, pyramid and more in 3D.
In 2D, drag the round handles — the three corners of a triangle, a corner of a rectangle, or the radius of a circle. In 3D, drag the solid to rotate it and use the sliders to set its radius, height or base.
The panel shows area and perimeter for 2D shapes, or surface area and volume for solids, updating as you drag — with the exact formula used shown underneath. Prefer worked steps for one number? Try the Area of a Triangle or Volume calculators.
The panel shows area and perimeter for 2D shapes, or surface area and volume for solids, updating as you drag — with the exact formula used shown underneath. Prefer worked steps for one number? Try the Fractal Generator or Volume calculators.