What Bikini Size Am I? How to Choose Your Size Without Guessing

The best way to choose a bikini size is to use the specific product's size guide and evaluate the top and bottom separately. There is no reliable universal rule that converts your usual clothing size into the same bikini size across every brand.

Why is bikini sizing difficult?

Swimwear combines stretch fabric, different cuts and different coverage levels. Two bikinis with the same size label can fit differently because the pattern, fabric and construction are different.

Should bikini top and bottom be the same size?

No. Your upper and lower body proportions can be different, so choose each piece independently.

What measurements matter for a bikini top?

The relevant measurements depend on the design, but chest and underbust area are usually important reference points. For triangle tops, adjustability also matters.

What measurements matter for bikini bottoms?

Waist, hip and seat fit can all influence the result. Coverage preference also matters, because two people with similar measurements may prefer different fits.

Should I size up if I am between sizes?

Not automatically. Use the brand's size guide, consider the cut, and think about whether you prefer more security or more room. The correct choice depends on the product.

How do I know if a bikini top is too small?

Possible signs include discomfort, unwanted pressure or not getting the coverage you want even after adjustment.

How do I know if bikini bottoms are too small?

Possible signs include discomfort, excessive digging at the edges or the fit shifting in a way that does not feel right during movement.

How does EcoAGN sizing work?

EcoAGN's current triangle swimwear range is available from 2XS to 6XL. Tops and bottoms are sold separately, so your chosen sizes do not need to match.

Browse Bikini Tops, Bikini Bottoms or use Build Your Bikini.

Frequently asked questions

Is bikini sizing the same as underwear sizing?

Not necessarily. Use the product-specific size guide rather than assuming the same size.

Should swimwear be tight?

It should feel secure, but not uncomfortably restrictive.

Can I order two different sizes?

Yes, when the bikini is sold as separates.

Related guides

Read Triangle Bikini Fit Guide and How to Choose a Bikini Top and Bottom Separately.