Match the cover’s stated centimeter diameter to the inflated ball’s actual diameter — a 65 cm cover fits a correctly inflated 65 cm ball, not your height.
A cover that’s too big slides and bunches underfoot; one too small fights the seams and keeps the ball from seating right. The fix is a tape measure and the ball’s own label, not the height chart.
What Ball Sizes Do Covers Actually Come In?
Covers are sold in three standard diameters: 55 cm, 65 cm, and 75 cm. Each cover is cut for one ball size, so the cover’s label must match the ball’s.
A 55 cm ball is roughly 22 inches across, a 65 cm ball about 26 inches, and a 75 cm ball around 30 inches, per manufacturer sizing documentation. Inch conversions matter because U.S. listings quote either unit — but covers are cut in centimeters regardless. Covers do not stretch to fit a neighbor size; wedging a 55 cm cover onto a 65 cm ball strains the fabric and leaves the ball lumpy.
Does Height Tell You Which Cover to Buy?
Height gets you into a ball size, and only then does it point at a cover. Manufacturer guidance: a 55 cm ball suits users around 5 ft to 5 ft 6 in, a 65 cm ball about 5 ft 7 in to 6 ft, and a 75 cm ball 6 ft and taller. A second guide frames it metrically: 55 cm for 150–165 cm, 65 cm for 165–180 cm, and 75 cm for 180–195 cm.
Treat that as a starting point, not a measurement — two people of the same height may prefer different diameters. The cover choice follows whichever ball you actually inflate. Once you know the ball, a tested roundup of the best yoga ball covers can save you hunting through size listings.
How Do You Measure the Ball Before Buying?
Inflate the ball to the manufacturer’s specification, then measure straight across its widest point in centimeters and compare with the cover label.
- Find the ball’s nominal size (55, 65, or 75 cm) on the ball, box, or manual — don’t guess from looks.
- Inflate with the supplied pump, not an air compressor, stopping at the manual’s diameter. SKY-TOUCH’s manual warns overinflation can burst the ball and cause a fall.
- Measure across the widest point with a tape or the included inflation strap.
- Cross-check circumference with a soft tape: roughly 172 cm for 55 cm, 204 cm for 65 cm, and 235 cm for 75 cm, per a manufacturer sizing chart.
- Buy the cover in the matching centimeter size — not “medium” or “large,” which vary between brands.
Follow your specific ball’s manual rather than blending brands — the measurement you take is the measurement the cover must fit.
| Ball Size | Approximate Diameter | Typical Height Range |
|---|---|---|
| 55 cm | About 22 in (172 cm circumference) | 5 ft to 5 ft 6 in |
| 65 cm | About 26 in (204 cm circumference) | 5 ft 7 in to 6 ft |
| 75 cm | About 30 in (235 cm circumference) | 6 ft and taller |
What Should You Check on the Cover Itself?
Confirm the cover is built for an exercise ball and seats without covering the valve or bunching. A cover for a small Pilates ball or balance trainer won’t fit even if the numbers look close.
Before each use, set the covered ball on a level, clear floor and check that the cover sits fully over the ball, doesn’t slide when pressed, and leaves the inflation valve clear. Look for torn seams, stretching, or slipping. A cover does not raise the ball’s anti-burst rating or weight limit — it’s a comfort and grip layer, nothing more.
For sizing precision, the SKY-TOUCH anti-burst exercise ball manual details inflation and diameter checks.
Common Questions
Is it worth buying one size up to be safe?
No. A cover one size up wrinkles under your weight, slips on hard floors, and may ride up over the valve. Buy the size matching your measured diameter exactly; if the ball itself is wrong for you, replace the ball rather than forcing a mismatched cover.
My ball says 65 cm but I measure about 60 cm. What cover fits?
Buy for the ball you actually have. An underinflated ball measures smaller than nominal, so add air to the manufacturer’s spec and re-measure. If it still won’t reach 65 cm, that cover will be loose — fix the inflation problem first.
Do cover sizes match across different brands?
Usually in centimeters, rarely in words. “Medium” from one seller can mean 55 cm and from another 65 cm. Rely on the centimeter figure in the listing, not the size word in the title.
Sources
- SKY-TOUCH. “Anti-Burst Fitness Yoga Ball Manual” Inflation limits, the 90% diameter caveat, and overinflation warnings.
- Exercise Ball Sizing Chart. “Ball Sizing and Circumference Reference” Height ranges, inch conversions, and circumference figures for 55/65/75 cm balls.
- Greater Goods. “75 cm Yoga Ball User Guide” Manufacturer documentation supporting the 75 cm size designation.