- Volume Calculator
- Area Calculator
- Perimeter Calculator
- Surface Area Calculator
- Circle Calculator
- Rectangle Calculator
- Triangle Calculator
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Regular Polygon CalculatorCalculate the area, perimeter, interior & exterior angles, apothem and circumradius of any regular polygon from its number of sides and side length.
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Ellipse CalculatorCalculate the area, perimeter (Ramanujan approximation), eccentricity and focal distance of an ellipse from its semi-major and semi-minor axes.
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Octagon CalculatorCalculate the area, perimeter, apothem, circumradius and diagonal of a regular octagon from its side length using exact geometric formulas.
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Hexagon CalculatorCalculate the area, perimeter, apothem and diagonal of a regular hexagon from its side length. Free, instant, with formulas and worked examples.
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Trapezoid CalculatorCalculate the area of a trapezoid instantly from its two parallel bases (a, b) and height (h). Also returns the median. Free, fast, and accurate.
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Rectangle Fence Perimeter CalculatorCalculate the perimeter of a rectangular fence from its length and width. Find total fencing footage and enclosed area instantly.
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Stadium CalculatorCalculate the area and perimeter of a stadium (discorectangle) shape from its radius r and straight side length a. Free geometry calculator.
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Rhombus CalculatorFree rhombus calculator. Enter the two diagonals to find the area, side length and perimeter instantly using area = (d₁×d₂)/2.
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Regular Polygon CalculatorCalculate the area, perimeter, apothem, circumradius and angles of any regular polygon from its number of sides and side length.
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Parallelogram CalculatorCalculate the area and perimeter of a parallelogram from its base, height, and side. Free, instant geometry calculator with formulas and examples.
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Isosceles Triangle Perimeter CalculatorCalculate the perimeter of an isosceles triangle. Enter the lengths of the two equal sides (a) and the base (b) to get P = 2a + b.
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Octagon Perimeter CalculatorEnter the side length to get an octagon’s perimeter instantly. We multiply the side by 8 (P = 8 × a) for a quick, accurate total.
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Square Perimeter CalculatorEnter the square’s side length to get its perimeter (P = 4 × side) — the total distance around the square — instantly.
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Hypotenuse Perimeter CalculatorCalculate hypotenuse perimeter quickly and accurately with this easy-to-use calculator. Input side A and side B to find the length of the hypotenuse and total perimeter of a right triangle.
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Circle Perimeter CalculatorEnter a circle's radius in cm, m, in, or ft to instantly get its perimeter (circumference) using P = 2πr. Fast, accurate, and classroom-ready.
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Kite Perimeter CalculatorEnter the lengths of the two distinct sides to compute a kite’s perimeter using P = 2(a + b). See the total distance around the shape instantly.
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Rectangle Perimeter CalculatorEnter length and width to instantly calculate a rectangle’s perimeter using P = 2(l + w). See the result and your inputs displayed for quick reference.
