Several minutes spent on reading this, may save you the time and money wasted in returning a wrong-sized ball and amount to have another shipped! Do read the information vigilantly before choosing a ball.

The universal rule for selecting the right exercise ball size for (abs/low back) exercises is to bent your knees and hips to 90 degrees i.e.: thighs parallel to floor when sitting on ball. This is the smallest size ball; some people choose a larger ball. Don’t get attracted by photos of models sitting on balls because generally they sit on a much larger ball than they could coach on as it appears better.

Think how you will make use of the ball and your body characteristics. Remember that if you are a beginner with poor balance, a larger ball will offer more strength and support, by making exercising easier. To keep away from being dissatisfied that your ball is smaller than you expected, test the ball size before ordering. The majority of people blow up a ball as it is so hard and overblown to its maximum diameter. To notice if a 55cm ball is perfect for you, leave a mark on a wall approx 20 inches high, and squat next to it. Go down a few inches depending on your weight and amount of inflation. Consider how tall the ball will be when you are sitting on it. Get a bigger size if you are not satisfied with this height!


  • Your Height Ball Size (max. height/diameter)
  • Less than 5′ 0″ 45 cm (18 in.)
  • 5′ 0″ to 5′ 5″ 55 cm (22 in.)  [purchase]
  • 5′ 6″- 6′ 1″ 65 cm (26 in.)  [purchase]
  • 6′ 2″ – 6′ 8″ 75 cm (30 in.)  [purchase]
  • 6′ 9″ and up 85 cm (34 in.)

A bigger BALL MAY BE required IF YOU:

  • have long legs for your height
  • suffer in back problems
  • are using the ball for stretching, yoga, or as an office chair

Using an Exercise Ball as an Office Chair

If the height of your desk is 29-30 inches and your height is average as well as weight, then the 65cm ball is perfect size. But, also consider the height of the chair seat that you will replace—remember the ball will sink when you sit down on it. The ball will not probably sink, when pump up closer to its maximum diameter. An exercise ball is hard at its maximum diameter. If you are doubtful, go with a larger ball that is one size bigger than the one shown in chart. It is advisable to get a ball with a max. Diameter that is at least 4 inches more than your chair height. If you are still not sure about the most suited size, talk with others who use the same ball as an office chair.