# Circumference of a Circle from Diameter

**Formula:**`C = πd`

## Introduction to Circumference of a Circle from Diameter

The circumference of a circle is calculated by multiplying the value of π (pi) with the circle's diameter. In this formula, ** C** represents the circumference of the circle, and

**is the distance across the circle, passing through the center. The result is expressed in the same units as the diameter, such as inches, centimeters, or any other unit of length measurement.**

*diameter*## Parameter usage:

`diameter`

: diameter of the circle

## Example valid values:

`diameter`

= 7

## Output:

`circumference`

= calculated circumference of the circle

## Data validation

The diameter should be a positive number.

## Summary

This calculator takes the diameter of a circle as input and outputs its circumference. It is not specific to a particular unit of measurement.

Tags: Geometry, Circle, Circumference, Diameter