We Value Your Privacy

We and our partners use technology such as cookies on our site to personalise content and ads, provide social media features, and analyse our traffic. Click below to consent to the use of this technology across the web. You can change your mind and change your consent choices at anytime by returning to this site.

Update Consent
Loading ...

How to Measure the Size of a Pool Ball

Updated February 21, 2017

Spheres such as pool balls are measured by their circumference and diameter. Squares and sided objects are measured according to width and length, but round three-dimensional objects are measured by calculating the distance around and through the object. Calculate the circumference of a pool ball with a string and a measuring tape, and the diameter with a ruler or measuring tape.

Loading ...
  1. Hold the end of a piece of yarn or string against any part of the pool ball. Wrap the yarn or string around the centre of the ball until it meets the end of the yarn/string you are holding against the ball's surface.

  2. Cut the piece of yarn or string exactly where the yarn/string meets the yarn or string end being held against the ball's surface. According to Science is Fun website, measuring circumference of a ball is easiest when using a piece of string. Any string or yarn will work.

  3. Place the string or yarn onto a flat surface such as a table. Align the yarn or string with a ruler or measuring tape. Measure the length of the piece of yarn or string. This measurement is the circumference of your pool ball.

  4. Hold a measuring tape or ruler above the pool ball. The diameter of a sphere or orb is the measurement of a "line" running through the centre of the widest part of the shape.

  5. Touch the measuring tape or ruler against the ball's surface, but don't follow the contours of the ball. The measuring device should be rigid above the ball.

  6. Measure the width of the widest part of the ball, which is normally the ball's centre. This is the diameter of the pool ball.

  7. Tip

    According to World Pool-Billiards Association, regulation pool balls should measure 2-1/4 inches in diameter and weigh about 170gr. Pool balls can be cleaned with soap and water. A set of balls consist of 15 colour striped or solid balls with numbers, and one solid white ball known as a cue ball.

Loading ...

Things You'll Need

  • 12-inch piece of yard or string
  • Scissors
  • Measuring tape or ruler

About the Author

Louise Harding

Louise Harding holds a B.A. in English language arts and is a licensed teacher. Harding is a professional fiction writer. She is mother to four children, two adopted internationally, and has had small businesses involving sewing and crafting for children and the home. Harding's frugal domestic skills help readers save money around the home.

Loading ...
Loading ...