Perimeter Calculator
Result
Perimeter Calculator — free online calculator.
Formula
- Perimeter Calculator calculates its result from S, Square, Rectangle, Length, Width, Equilateral Triangle, Diameter, Circle, Hexagon. It uses the formula Square: 4s; Rectangle: 2(l+w); Equilateral triangle: 3s; Circle: π×diameter; Hexagon: 6s. Change any input to recalculate the result instantly.
- The main inputs are Shape, Side 1 / Radius, Side 2. Enter them in the units and format shown in the calculator.
- Keep comparable quantities in compatible units whenever the formula combines or compares them.
- Changing any input above recalculates the result with the same calculation engine used by this page.
Example: Perimeter
- Shape: rectangle
- Side 1 / Radius: 10
- Side 2: 6 Rectangle Width
Using S = 2, Square = 3, Rectangle = 4, Length = 5, Width = 6, Equilateral Triangle = 7, Diameter = 8, Circle = 9, Hexagon = 10, the calculated result is 3.3333333333.
Sample result: Calculating…
Frequently asked questions
What does the Perimeter calculate?
Perimeter Calculator — free online calculator.
Which values should I enter?
Enter Shape, Side 1 / Radius, Side 2 using the units and format shown beside each field.
What formula does this calculator use?
The calculator uses the following relationship: Square: 4s; Rectangle: 2(l+w); Equilateral triangle: 3s; Circle: π×diameter; Hexagon: 6s.
Why might my result differ from another source?
Results can differ when another source uses different units, rounding rules, conventions or assumptions. Compare the inputs and definitions before comparing results.
Does the result update automatically?
Yes. Changing an input updates the result using the same calculation engine shown on this page.