# Circumference to Diameter Calculator

The circumference to diameter calculator can help you solve the geometry problem of finding the circumference of a circle by inputting its diameter. This calculator works both ways, so you can also convert a diameter to a circumference.

Keep reading to learn more about:

- The circumference to diameter formula.
- How to calculate circumference from the diameter.
- How to get diameter from the circumference.

## The circumference to diameter formula

**Diameter and circumference are lengths related to each other** — the higher the diameter, the higher the circumference. The **circumference to diameter formula** connects these variables in a single equation:

`c = πd`

,

, where:

`c`

stands for the circumference;`d`

for the diameter; and`π`

is the pi number.

If on the other side, you're interested in how to calculate diameter from the circumference, you can solve for `d`

in the above equation:

`d = c/π`

.

💡 **Did you know?**

As you can imagine from the above equations, the number `π`

is a constant equal to the **circumference-to-diameter ratio** of a circle (`π=c/d`

). If you divide the circumference by the diameter, independently of the size, **it'll always be 3.14159265...**

## How to find circumference from diameter: an example

Let's look at an example. Suppose you want to find **the circumference of a 5 cm diameter** circle. These would be the steps to follow:

**Use the appropriate equation**, which, in this case, is the circumference to diameter formula:`c = πd.`

**Input the diameter**in the equation:`c = π × (5 cm) = 15.708 cm`

.- That's it. Also,
**check your results**using our circumference to diameter calculator. Input 5 cm in the diameter box. Your result should also be 15.708 cm.

## Other-circle related tools

Now that you know how to find circumference from diameter and vice-versa, you can look at other tools related to circle calculations.

- Circle calc: find c, d, a, r;
- Circle measurements calculator;
- Circle formula calculator;
- Radius of a circle calculator;
- Circle length calculator;
- Circumference and area of a circle calculator;
- Diameter of a circle calculator;
- Circle perimeter calculator;
- Square footage of a circle calculator; and
- Square inches of a circle calculator.

## FAQ

### What is the circumference of a 6-foot diameter circle?

**18.8496 feet**. To **convert diameter to circumference**:

- Take the
**diameter**. **Multiply**it by the number**pi (π)**.- In this case, the circumference equals:
`π × 6 ft = 18.8496 ft`

.

### How do I get diameter from circumference?

Divide the **circumference** value by the number pi (π), or use the formula `d = c/π`

. That's how you find the circumference of a circle with its diameter.