How do I know my bikini top size?

Your bikini top size is typically the same as your bra size. Measure your underbust and bust, calculate the difference for cup size, and use your bra size (e.g., 34C) for bikini tops with cup sizing. For S/M/L tops, use our calculator to convert from your bra size.

Should I size up or down in swimwear?

For bikini tops, stay true to your bra size or size down if between sizes - swimwear stretches when wet and a snug fit provides better support. For bottoms, size up if you prefer more coverage. One-pieces should fit snugly as they stretch in water.

How do I measure for a one-piece swimsuit?

Measure your torso by placing the tape at your shoulder, running it down through your legs and back up to the same shoulder. Also measure your bust, waist, and hips. Most one-pieces are sized by dress size (6, 8, 10) or alpha size (S, M, L).

What bikini bottom size should I get?

Bikini bottom size is based on your hip measurement. Measure around the fullest part of your hips. Use our calculator to convert hip measurements to standard sizes (XS-XL or numeric sizes). If between sizes, size up for more coverage or down for a Brazilian cut.

Are bikini sizes the same as bra sizes?

Bikini tops with cup sizing (32C, 34D) use the same sizing as bras. However, many bikinis use S/M/L sizing which corresponds to a range of bra sizes. Bikini bottoms use dress sizing or S/M/L and are based on hip measurements, not bra size.

Swimwear Size Calculator – Find Your Bikini & Swimsuit Size

Calculate your perfect swimwear size for bikini tops, bottoms, and one-piece swimsuits. Get results in multiple sizing systems with style recommendations.

How would you like to calculate?

Band Size

Cup Size

Underbust

Bust

Enter your measurements

Hip Measurement

Measure around fullest part of hips

Waist (optional)

For high-waisted styles

Coverage Preference

Minimal Brazilian, cheeky Moderate Classic, hipster Full High-waist, boy short

Enter your measurements

Bust

Waist

Hips

Torso Length (optional)

Measure from shoulder, through legs, back to same shoulder

Height

Swimwear Sizing Tips

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Swimwear Stretches When Wet

Choose a snug fit - swimwear stretches and gets heavier in water. If between sizes, size down for support.

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Bikini Tops = Bra Size

Cup-sized bikini tops use bra sizing (32C, 34D). For better support, look for underwire or built-in bra styles.

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Mix & Match Sizes

Many women need different sizes for top and bottom. Buy separates when possible for the best fit.

Frequently Asked Questions

Your bikini top size is typically the same as your bra size for cup-sized tops. For S/M/L sizing, use our calculator to convert. A 32B-34A typically wears Small, 34B-36B wears Medium, and 36C-38C wears Large.

For tops: if between sizes, size down - swim fabric stretches when wet. For bottoms: size up if you want more coverage, size down for a Brazilian/cheeky fit. For one-pieces: a snug fit is better as they stretch in water.

Hourglass: most styles work, try high-waisted. Pear: bright tops, dark bottoms, high-leg cuts. Apple: tankinis, one-pieces with ruching. Athletic: ruffles, push-up tops, side-tie bottoms. Busty: underwire tops, halter necks, wide straps.

A well-fitting bikini top should: fit snugly around the band (it will stretch in water), fully contain your breasts without spillage, have straps that stay in place without digging, feel secure enough to swim without adjusting.