How to Calculate Circumference of a Circle (Step by Step) | Circumference Formula?

Circumference is just the distance around a circle, like measuring how long a string would be if you wrapped it around a round plate.

Imagine you have a circle, like a pizza or a wheel. The circumference is how far it goes all the way around. To find that, we use a special number called pi (π), which is about 3.14, it's like a secret helper for circles!

If you know the diameter of the circle, that’s the distance across it through the center, just multiply it by pi to get the circumference.

For example:

• If the diameter is 6 inches, then 6 × π = about 18.84 inches.
• That's how long a ribbon would be if you wrapped it around the circle!

If you only know the radius, which is half of the diameter, just double it and multiply by pi.

For example:

• If the radius is 3 inches, then 3 × 2 = 6 (the diameter), and then 6 × π = about 18.84 inches again!

You can use either method, like choosing between a ruler or a tape measure, to find how long around your circle really is! Circumference is just the distance around a circle, like measuring how long a string would be if you wrapped it around a round plate.

Imagine you have a circle, like a pizza or a wheel. The circumference is how far it goes all the way around. To find that, we use a special number called pi (π), which is about 3.14, it's like a secret helper for circles!

If you know the diameter of the circle, that’s the distance across it through the center, just multiply it by pi to get the circumference.

For example:

• If the diameter is 6 inches, then 6 × π = about 18.84 inches.
• That's how long a ribbon would be if you wrapped it around the circle!