Perimeter Calculator
Calculate the perimeter of rectangles, circles (circumference), triangles, and regular polygons with any number of sides.
Inputs
units
units
Results
Perimeter
30 units
Formula UsedP = 2(l + w)
Perimeter
30 units
How to Use This Calculator
- Start by filling in the input fields below. Results update instantly as you type, so you can experiment with different values to see how they affect the outcome.
- Shape — The geometric shape to calculate. Choose from: Rectangle, Circle, Equilateral Triangle, Regular Polygon. default: 0.
- Length / Radius / Side — Length of the shape or side. Accepts values from 0 units to 100,000 units (default: 10 units).
- Width — Used for rectangles. Accepts values from 0 units to 100,000 units (default: 5 units).
- Number of Sides — Used for regular polygons. Accepts values from 3 to 100 (default: 6).
- Once all inputs are set, review your results in the Results panel. Here's what each output means:
- Perimeter — shown as a numeric value. This is the primary result of this calculator.
- Formula Used — your calculated result.
- Explore the related calculators below if you need deeper analysis or want to approach this topic from a different angle.
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