Perimeter Calculator

  • Arc Length as Fraction of Circumference Calculator
    Find the arc length of a circle from its radius and central angle, and see what fraction and percentage of the full circumference the arc represents.
  • Scalene Triangle Perimeter Calculator
    Calculate the perimeter of a scalene triangle by adding its three unequal sides: P = a + b + c. Fast, accurate, free online tool.
  • Length and Width of a Rectangle Given Perimeter Calculator
    Find the missing length or width of a rectangle from its perimeter and one known side. Uses width = P/2 − length. Fast, free and accurate.
  • Isosceles Triangle Perimeter Calculator
    Calculate the perimeter of an isosceles triangle. Enter the lengths of the two equal sides (a) and the base (b) to get P = 2a + b.
  • Octagon Perimeter Calculator
    Enter the side length to get an octagon’s perimeter instantly. We multiply the side by 8 (P = 8 × a) for a quick, accurate total.
  • Square Perimeter Calculator
    Enter the square’s side length to get its perimeter (P = 4 × side) — the total distance around the square — instantly.
  • Hypotenuse Perimeter Calculator
    Calculate 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.
  • Rectangle Perimeter Calculator
    Enter 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.
  • Rectangle Fence Perimeter Calculator
    Calculate the perimeter of a rectangular fence from its length and width. Find total fencing footage and enclosed area instantly.
  • Trapezoid Side Calculator
    Find the unknown fourth side of a trapezoid from its perimeter and three known sides. Free, instant trapezoid missing side calculator.
  • Trapezoid Perimeter Calculator
    Calculate the perimeter of any trapezoid instantly by adding its four side lengths (a + b + c + d). Free, fast, and works with any unit.
  • Kite Perimeter Calculator
    Enter 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.
  • Quarter Circle Perimeter Calculator
    Calculate the perimeter of a quarter circle from its radius using P = (πr/2) + 2r. Instant arc length and straight-edge breakdown.
  • Perimeter of a Triangle with Vertices Calculator
    Find the perimeter of a triangle from its three vertex coordinates (x, y). Uses the distance formula to sum all three side lengths instantly.
  • Perimeter of a Triangle with Fractions Calculator
    Find the perimeter of a triangle whose sides are fractions. Enter each side as numerator/denominator and get P = a + b + c instantly.
  • Perimeter of a Sector Calculator
    Calculate the perimeter of a circular sector from its radius and central angle (degrees or radians). Uses P = 2r + rθ with the arc length.
  • Perimeter of a Square Calculator
    Calculate the perimeter of a square instantly from its side length using P = 4s. Free, fast, and accurate geometry calculator with worked examples.
  • Perimeter of a Right Triangle Calculator
    Calculate the perimeter of a right triangle from its two legs. Enter leg a and leg b to get the hypotenuse and total perimeter instantly.
  • Circle Perimeter Calculator
    Enter a circle's radius in cm, m, in, or ft to instantly get its perimeter (circumference) using P = 2πr. Fast, accurate, and classroom-ready.
  • Perimeter of a Rectangle with Given Area Calculator
    Find the perimeter of a rectangle from its area and width using P = 2(w + Area/w). Free, instant calculator with worked example and formula.
  • Perimeter of a Polygon Calculator
    Calculate the perimeter of any polygon. Use P = n×s for regular polygons or sum all side lengths for irregular shapes. Free, fast and accurate.
  • Perimeter of a Rectangle Calculator
    Calculate the perimeter of a rectangle instantly using P = 2 × (length + width). Enter length and width to get the perimeter and area in any units.
  • Perimeter of a Quadrilateral Calculator
    Calculate the perimeter of any quadrilateral by adding its four side lengths (a + b + c + d). Fast, free, and works for any units.
  • Parallelogram Perimeter Calculator
    Calculate 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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