Women's Fashion

Swimwear Size Calculator: Swimsuit, Bikini and Full-Coverage Swimwear Size

Free tool · Updated October 2, 2026 · By CouponTalk

Your result

Enter your measurements to see your result.

Quick answer

A one-piece swimsuit has to fit bust, waist and hips at once, so take the largest of the three sizes. Bikinis and tankinis come in separates: size the top by bust and the bottom by hips. Swimwear should feel snug when dry, because fabric loosens in water. If you have a long torso, choose a one-piece marked "long torso" or size up one.

How to measure

Measure bust, waist and hips over light underwear.
Pick the style you want to buy.
For separates, order the top and bottom sizes shown, which may differ.

Swimwear Size Chart

Swimwear size chart
Size	Bust up to	Waist up to	Hips up to	UK
XS	32"	26"	35"	6
S	34"	28"	37"	8
M	36"	30"	39"	10
L	38"	32"	41"	12
XL	40"	34"	43"	14
XXL	42"	36"	45"	16
3XL	44"	38"	47"	18

Fit varies by brand and fabric. Check the brand chart when buying.

Frequently asked questions

Should swimwear be tight?

Snug, not tight. It should not dig in, but it should not sag either, since it stretches when wet.

Can I buy a different top and bottom size?

Yes. Many bikinis are sold as separates because bust and hips often differ by a size.

What is a burkini size based on?

Full-coverage swimwear fits like a relaxed tunic and leggings, so take the largest size from your measurements.

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