Geometry

Geometry calculators for plane and solid figures: circle, triangle (equilateral, isosceles, scalene, right), square, rectangle, parallelogram, trapezoid, rhombus, regular hexagon, regular pentagon, regular N-sided polygon, ellipse, circular sector and more. Each tool calculates area, perimeter and — when applicable — diagonal and interior angles from the measurements you provide. All mathematical formulas used are shown next to the result — no black box, you learn and verify. Useful for elementary and high school students learning geometry, teachers preparing exercises and examples, professionals in engineering, architecture, design, civil construction, carpentry, sewing and any field involving physical measurements. Supports meters, centimeters and millimeters. Real-time results as you type the measurements. 100% in the browser, no signup, no intrusive ads. Available in English, Portuguese and Spanish — perfect for those studying math in multiple languages or working in international environments.