- Volume Calculator
- Area Calculator
- Perimeter Calculator
- Surface Area Calculator
- Circle Calculator
- Rectangle Calculator
- Triangle Calculator
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Heron's Formula CalculatorCalculate the area of any triangle from its three side lengths using Heron's formula. Instantly get the area, semi-perimeter, and perimeter.
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Pentagon CalculatorCalculate the area, perimeter, apothem, circumradius and diagonal of a regular pentagon from its side length with exact geometric formulas.
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Area of a Right Triangle CalculatorCalculate the area of a right triangle from its two legs (base and height). Also returns the hypotenuse and perimeter instantly. Free online tool.
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Star Shape CalculatorCalculate the area, edge length and perimeter of an n-pointed star polygon from its outer radius R and inner radius r. Free, instant, and accurate.
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Circular Segment Area CalculatorCalculate the area of a circular segment from radius and central angle (degrees or radians). Also returns arc length, chord length, and sagitta height.
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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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Cross-Sectional Area CalculatorCalculate the cross-sectional area of a circle (A=πr²), rectangle (A=w·h), or pipe/annulus (A=π(r_out²−r_in²)) instantly with this free tool.
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Cyclic Quadrilateral Area CalculatorCompute the area and perimeter of a cyclic quadrilateral from its four side lengths using Brahmagupta's formula. Free, instant, with validity check.
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Quadrilateral Area from Four Sides and Opposite Angles (Bretschneider's Formula)Compute the area and perimeter of any quadrilateral from its four side lengths and the sum of one pair of opposite angles using Bretschneider's formula.
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Area of an Obtuse Triangle CalculatorFind the area of an obtuse triangle using base and height or Heron's formula from three sides. Free, instant, and accurate online calculator.
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Irregular Polygon Area CalculatorFind the area of any irregular polygon from its vertex coordinates using the Shoelace formula. Also returns perimeter and vertex count. Free and instant.
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Area Unit Conversion CalculatorConvert any area between metric (m2, hectare, are), imperial/US (acre, sq ft, sq mi) and traditional Japanese units (tsubo, se, tan, cho) at once.
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Rabbit Cage Size CalculatorCalculate the minimum cage area and recommended floor space your rabbit needs based on its stretched length, width, and the number of rabbits housed.
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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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Rhombus Area, Perimeter and Vertex Angles from DiagonalsEnter the two diagonals of a rhombus to instantly compute its area, perimeter, and both interior vertex angles. Universal geometry tool with worked example.
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Parabolic Segment (Arch) Area and Arc Length CalculatorCompute the area and arc length of a parabolic segment (arch) from its height a and chord length b. Exact geometric formulas with worked examples.
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Triangle Area Calculator (Base and Height)Compute the area of a triangle from its base length and perpendicular height using S = 1/2 x a x h. Unit-agnostic; fast and accurate.
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Parallelogram Area from Two Sides and Included AngleCompute the area and perimeter of a parallelogram from two adjacent sides and the included angle (degrees or radians). Free, instant, accurate.
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Triangle Area from Three Sides (Heron's Formula) CalculatorCalculate the area of any triangle from its three side lengths using Heron's formula. Enter sides a, b and c in the same unit and get the area instantly.
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Circular Segment Area from Central Angle CalculatorCompute the area, arc length, and chord length of a circular segment from its radius and central angle (degrees or radians). Free, precise geometry tool.
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Triangle Area from Two Sides and Included AngleCompute a triangle's area, perimeter and height from two sides and the included angle. Uses S = (1/2)ab sin(theta) plus the law of cosines. Degrees or radians.
