Swimwear Size Guide & Converter
Finding the perfect swimsuit fit is essential for comfort and confidence. Use our comprehensive size chart to convert between US, UK, EU, and Australian sizing for bikinis, one-pieces, and all swimwear styles.
Women’s Swimwear Size Chart
Covers one-piece swimsuits, bikini tops, and bikini bottoms. Bikini bottoms typically follow hip measurement; tops follow bust measurement.
Quick Converter
| US | UK | EU | AU | Bust (in) | Waist (in) | Hip (in) |
|---|---|---|---|---|---|---|
| 0 (XS) | 4 | 30 | 4 | 30-31 | 23-24 | 33-34 |
| 2 (XS) | 6 | 32 | 6 | 32 | 25 | 35 |
| 4 (S) | 8 | 34 | 8 | 33-34 | 26-27 | 36-37 |
| 6 (S) | 10 | 36 | 10 | 35 | 28 | 38 |
| 8 (M) | 12 | 38 | 12 | 36-37 | 29-30 | 39-40 |
| 10 (M) | 14 | 40 | 14 | 38 | 31 | 41 |
| 12 (L) | 16 | 42 | 16 | 39-40 | 32-33 | 42-43 |
| 14 (L) | 18 | 44 | 18 | 41-42 | 34-35 | 44-45 |
| 16 (XL) | 20 | 46 | 20 | 43-44 | 36-37 | 46-47 |
| 18 (XXL) | 22 | 48 | 22 | 45-46 | 38-40 | 48-49 |
Click any row to highlight it. Sizes are approximate and may vary by brand.
How to Measure for Swimwear
Bust
Wrap a measuring tape around the fullest part of your bust, keeping it level across your back. Do not pull the tape too tight — it should sit comfortably against your skin.
Waist
Measure around your natural waistline, the narrowest part of your torso, usually just above the navel. Keep the tape snug but not compressing your skin.
Hips
Stand with your feet together and measure around the fullest part of your hips and buttocks. This measurement is especially important for bikini bottoms and one-piece suits.
Swimwear Fit Tips by Style
One-Piece Swimsuits
One-piece suits need to accommodate your full torso length. If you have a longer torso, look for brands that offer “long” sizing. The suit should lie flat against your body without pulling at the shoulders or riding up at the hips.
Check that the leg openings sit comfortably without digging in. Adjustable straps are helpful for fine-tuning the fit after ordering.
Bikinis & Two-Pieces
The advantage of separates is the ability to mix top and bottom sizes. For the top, your band size (underbust measurement) and cup size matter most. Triangle tops are more forgiving; underwire styles require a precise fit.
For bottoms, hip measurement is the key. High-waisted bottoms may also require checking your waist measurement to avoid gapping at the waistband.
Frequently Asked Questions
Should I size up or down in swimwear?
If you are between sizes, most stylists recommend sizing up for one-piece swimsuits for comfort and sizing down for bikini tops if you prefer more support. Fabric with higher spandex content tends to stretch over time, so a snug initial fit often works best.
Are bikini top and bottom sizes always the same?
Not necessarily. Many brands sell bikini tops and bottoms separately so you can mix sizes. Your top size is driven by your bust measurement while the bottom follows your hip measurement.
How does swimwear sizing differ from regular clothing?
Swimwear is designed to fit closer to the body, so some brands cut slightly smaller than everyday clothing. Always check the specific brand size chart, and use body measurements rather than your usual dress size when ordering online.
Do Australian and UK swimwear sizes match?
Australian and UK sizing are very close and often identical for swimwear. However, there can be slight differences between brands, so cross-reference with body measurements for the most accurate fit.
See How Swimwear Looks on You Before You Buy
Use our AI-powered virtual try-on to visualize swimsuits on a model that matches your body type. No more guessing, no more returns.
