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📐 Geometry Calculator

All-in-one geometry calculator for 25 common 2D shapes and 3D solids — area, perimeter, volume, surface area. Reverse-solve from any known value, with parameter-responsive SVG diagrams, substituted formula steps, per-field unit conversion, and adjustable significant figures / π precision.

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All-in-one geometry calculator covering 25 common 2D shapes and 3D solids — area, perimeter, volume, and surface area. Features reverse-solve from any known value, parameter-responsive SVG diagrams, substituted formula steps, per-field unit conversion (mm/cm/m/km/in/ft/yd), adjustable significant figures (2-12), tunable π precision (3.14 / 3.14159 / Math.PI), and an exact-π form toggle. Bilingual labels with a variable legend serve both Chinese and English math conventions — great for study, design, engineering, and everyday calculation.