Area, perimeter, volume & surface area for 12 shapes — with unit conversion and formula display.
Select a shape, enter values and calculate
Calculate area, perimeter, circumference, volume and surface area for 12 common shapes instantly. Built for students, teachers, engineers and construction professionals — no formulas to memorize, just enter your values.
| Shape | Calculation | Formula |
|---|---|---|
| Square | Area | a² |
| Rectangle | Area | l × w |
| Triangle | Area | ½ × b × h |
| Circle | Area | π × r² |
| Ellipse | Area | π × a × b |
| Trapezoid | Area | ½ × (a + b) × h |
| Sphere | Volume | ⁴⁄₃ × π × r³ |
| Cylinder | Volume | π × r² × h |
| Cone | Volume | ⅓ × π × r² × h |
| Cube | Surface Area | 6 × a² |
This geometry calculator is used by school and university students for homework and exam prep, teachers for quick formula verification, civil engineers for area estimation, interior designers for room planning, and developers needing quick geometry checks.