# Perimeter Calculator

Calculate the perimeter of various geometric shapes

> Canonical page: https://elysiatools.com/en/tools/perimeter-calculator

- **Category:** Math & Numbers

- **Keywords:** perimeter, geometry, calculator, shapes, rectangle, circle, triangle, square, trapezoid

## Overview

The Perimeter Calculator is a straightforward online tool designed to compute the perimeter of common geometric shapes, including rectangles, squares, circles, triangles, and trapezoids. Simply select the shape and input the required dimensions to receive an instant, accurate result.

## Inputs

- **Shape** (select)
- **Length** (number): Enter length
- **Width** (number): Enter width
- **Radius** (number): Enter radius
- **Side** (number): Enter side length
- **Side A** (number): Enter side A length
- **Side B** (number): Enter side B length
- **Side C** (number): Enter side C length
- **Base** (number): Enter base length
- **Top** (number): Enter top length
- **Side 1** (number): Enter side 1 length
- **Side 2** (number): Enter side 2 length

## When to use

- When solving geometry problems for homework or exams that involve calculating perimeters.
- For planning projects like fencing, framing, or crafting where precise border lengths are needed.
- To quickly verify manual calculations or measurements in design and construction tasks.

## How it works

- Select the geometric shape from the dropdown menu, such as rectangle, circle, or triangle.
- Enter the relevant dimensions based on the shape, like length and width for a rectangle or radius for a circle.
- The tool automatically calculates and displays the perimeter using standard geometric formulas.

## Use cases

- Students calculating perimeters for math assignments or geometry lessons.
- DIY enthusiasts measuring materials for home projects like garden borders or picture frames.
- Educators demonstrating perimeter concepts in interactive classroom activities.

## Frequently asked questions

### What shapes are supported by this calculator?

It supports rectangles, squares, circles, triangles, and trapezoids.

### How do I know which dimensions to enter?

The tool prompts for shape-specific inputs; for example, a rectangle requires length and width, while a circle needs radius.

### Are the calculations accurate?

Yes, calculations are based on precise geometric formulas for perimeter and circumference.

### Can I use this tool for irregular shapes?

No, it only handles the predefined regular shapes listed in the options.

### Is there a cost or registration required?

No, the tool is free to use with no sign-up needed.

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