# Circle Length Calculator

Table of contents

Radius, diameter, and circumference: the circle length formulaHow to calculate the length of a circle?Other awesome circle-related calculatorsFAQsIf you want to learn **how to calculate the length of a circle**, our circle length calculator is the perfect tool 🎯. You can use this calculator to:

- Find the length of the
**radius**of the circle. - Calculate the length of the
**diameter**of a circle. - Find the length of the
**circumference**.

Read on to learn more about how to find the length of a circle.

## Radius, diameter, and circumference: the circle length formula

Radius `r`

, diameter `d`

, and circumference `c`

are related. **The higher the radius or the diameter, the higher the circumference**. The circle length formula connects these variables in a single equation:

` c = 2πr`

If you only know the diameter, you can find the length of the radius of the circle by simply remembering the **diameter is twice the radius**:

`r = d/2`

Reordering the equations, you can also calculate the length of the circle **diameter in terms of the circumference**:

`d = c/π`

Similarly, you can know what the length of the **radius** of the circle is:

`r = c/(2π)`

## How to calculate the length of a circle?

Let's suppose you want to know what is the **length of the radius of a circle of 10 cm circumference**. You can follow these steps:

- Use an
**adequate formula**to solve your problem. In this case, it would be`r = c/(2π)`

. **Input the circumference in the formula**. The result should be:`r = 10cm / (2π)`

.**Double-check your results**. Input 10 cm in the circumference box of the circle length calculator. The result should also be**1.59155 cm**for the radius.

### What is the length of half a circle?

The length of half a circle is π (pi) times radius, expressed with the formula as ** c_{half} = πr** or

**. It is the length of an ordinary circle divided by two in this case.**

*c*_{half}=*πd*/2### What is the circumference of a 6-inch circle?

**18.8496 inches**. To find the circumference of any circle, multiply its diameter by π. In this instance:

- Take the circle's diameter, which is
`6 in`

. - Multiply it by
`π`

. - The result is
`18.8496 in`

.