selecting the correct exercise ball size
Selecting the correct size exercise ball for you to use is determined by sitting in the correct exercise position: Sit on the exercise ball with your feet flat. Your hips and knees should form a 90-degree angle with each other. This is called the 90-degree rule for sitting. It is the correct exercise position for using your ball.

Guidelines for determining the appropriate exercise ball size for individuals who exercise in a sitting position: The ball size is determined by your height, weight and intended exercise position (sitting, lying on your back, standing, etc.). For example: if you are 56 tall and weigh 250 lbs. You would best use a 65 cm. ball. However, if you are 5 8 tall and have very short legs you would want to try a 55 cm. ball.

If you happened to purchase a ball bigger in diameter than these guidelines you can simply not inflate your ball as much. For example if you purchased a 65 cm. ball and are only 5 3 tall, fit the ball using the 90-degree rule in sitting. If your exercise ball is under-inflated, the ball will not be as firm, but you will continue to reap the benefits of the ball.
selecting the correct exercise ball size
How to Select the
Correct Exercise Ball Size
20-25 cm. ball (8-10 inches) For non-sitting exercises requiring a small ball
30 cm. ball (14 inches) Children 2-5 years old
42/45 cm. ball (16 inches) 4 ft. 10 in. tall person
55/52 cm. ball (21 inches) 4ft. 11in. to 5ft. 3in. tall person
65 cm. ball (25 inches) 5ft. 4in. to 5ft. 11in. tall person
75 cm. ball (29 inches) 6 ft. tall person & taller
Exercise Ball Sizing Chart

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Here is version of the chart for your consideration:

30cm ball - 12" good for people under 4' 6"
45cm ball - 18" good for people 4'6" to 4'8"
55cm ball - 22" good for people 4'8" to 5' 4"
65cm ball - 26" good for people 5'4" to 5'9"
75cm ball - 30"  good for people 5'9" - 6'4"
85cm ball - 34" good for people over 6'5"
95cm - 38"
105cm - 42"
120cm - 48"

*Often people choose 1 size larger if ball is used only for sitting.
Exercise Equipment