AOK Health Size Guide

 

BALL SIZE	COMBO-SIZING (Suitable for combined sitting and exercise)	EXER-SIZING (Suitable for mainly exercise)
45cm	<150cm	<160cm
55cm	150cm - 165cm	160cm - 175cm
65cm	162cm - 183cm	175cm - 195cm
75cm	180cm - 200cm	195cm+
85cm	198cm+

These sizes are not definitive but only a guide. Larger/bulkier individuals may need a larger size ball than shown purely for comfort and not biomechanics.

Using the ball for weight lifting is also better with a larger ball than normal. There is only 10-20% loss of efficiency if using a larger ball size for exercise. You will rarely use a Swiss ball at its maximum inflated diameter. Best results are at 90-95% inflation.

 

Progressing Ballet Technique Size Guide

 

BALL SIZE	HEIGHT
45cm	Under 142cm / 4'8"
55cm	142cm - 160cm / 4'8" - 5'3"
65cm	160cm - 178cm / 5'4" - 5'10"
75cm	178cm - 193cm / 5'10" - 6'4"

When you stand next to an exercise ball, it should be even or slightly above your knee level. The best way to size up your ball is by sitting on it. When you sit on the ball, knees should be bent at a 90-degree angle and your thighs should be parallel or even with the floor. You could substitute a fitball for a chair to find your height and see which ball size suits.