- Volume Calculator
- Area Calculator
- Perimeter Calculator
- Surface Area Calculator
- Circle Calculator
- Rectangle Calculator
- Triangle Calculator
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Equilateral Triangle Perimeter CalculatorCalculate the perimeter of an equilateral triangle instantly using P = 3a. Enter the side length to get the total perimeter in one click.
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Trapezoid Perimeter CalculatorCalculate the perimeter of any trapezoid instantly by adding its four side lengths (a + b + c + d). Free, fast, and works with any unit.
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Trapezoid Side CalculatorFind the unknown fourth side of a trapezoid from its perimeter and three known sides. Free, instant trapezoid missing side calculator.
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Quarter Circle Perimeter CalculatorCalculate the perimeter of a quarter circle from its radius using P = (πr/2) + 2r. Instant arc length and straight-edge breakdown.
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Perimeter of a Triangle with Fractions CalculatorFind the perimeter of a triangle whose sides are fractions. Enter each side as numerator/denominator and get P = a + b + c instantly.
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Perimeter of a Triangle with Vertices CalculatorFind the perimeter of a triangle from its three vertex coordinates (x, y). Uses the distance formula to sum all three side lengths instantly.
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Perimeter of a Sector CalculatorCalculate the perimeter of a circular sector from its radius and central angle (degrees or radians). Uses P = 2r + rθ with the arc length.
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Perimeter of a Right Triangle CalculatorCalculate the perimeter of a right triangle from its two legs. Enter leg a and leg b to get the hypotenuse and total perimeter instantly.
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Perimeter of a Square CalculatorCalculate the perimeter of a square instantly from its side length using P = 4s. Free, fast, and accurate geometry calculator with worked examples.
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Perimeter of a Rectangle with Given Area CalculatorFind the perimeter of a rectangle from its area and width using P = 2(w + Area/w). Free, instant calculator with worked example and formula.
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Perimeter of a Polygon CalculatorCalculate the perimeter of any polygon. Use P = n×s for regular polygons or sum all side lengths for irregular shapes. Free, fast and accurate.
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Perimeter of a Rectangle CalculatorCalculate the perimeter of a rectangle instantly using P = 2 × (length + width). Enter length and width to get the perimeter and area in any units.
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Perimeter of a Quadrilateral CalculatorCalculate the perimeter of any quadrilateral by adding its four side lengths (a + b + c + d). Fast, free, and works for any units.
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Parallelogram Perimeter CalculatorCalculate the perimeter of a parallelogram instantly from its two side lengths using P = 2 × (a + b). Free, fast, and accurate geometry tool.
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Length and Width of a Rectangle Given Perimeter CalculatorFind the missing length or width of a rectangle from its perimeter and one known side. Uses width = P/2 − length. Fast, free and accurate.
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Isosceles Trapezoid CalculatorCalculate the area, leg length, and perimeter of an isosceles trapezoid from its two parallel bases and height. Fast, accurate geometry tool.
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Heptagon CalculatorCalculate the area, perimeter, apothem and circumradius of a regular heptagon (7-sided polygon) from its side length. Fast, free and accurate.
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Ellipse Perimeter CalculatorCalculate the perimeter (circumference) of an ellipse from its semi-major and semi-minor axes using Ramanujan's highly accurate approximation. Free and fast.
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Dodecagon CalculatorCalculate the area, perimeter, apothem and circumradius of a regular dodecagon (12-sided polygon) from its side length instantly.
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Decagon CalculatorCalculate the area, perimeter, apothem and circumradius of a regular decagon (10-sided polygon) from its side length, with formulas and a worked example.
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Circumference CalculatorCalculate the circumference of a circle from its radius or diameter using C = 2πr = πd. Also returns the area, radius, and diameter instantly.
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Perimeter of a Triangle CalculatorCalculate the perimeter of a triangle from its three side lengths instantly. Uses P = a + b + c and also shows the semi-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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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.
