Swimwear Size Converter

Understanding Swimwear Sizing

Swimwear sizing is uniquely complex because swimsuits must fit snugly when wet, account for different body shapes, and provide adequate support and coverage. Unlike regular clothing, swimwear stretches when wet and must maintain its shape and coverage during swimming and other water activities. One-piece suits require additional measurements like torso length, while bikinis and two-piece suits allow for mix-and-match sizing. Our swimwear size converter helps you navigate international sizing differences, but understanding your body type and the specific style of swimsuit is equally important.

Key Tips for Swimwear Sizing

• Torso Length Matters for One-Pieces: The most overlooked measurement for one-piece swimsuits is torso length. Measure from the highest point of your shoulder, down through your legs, and back up to the starting point. A suit that's too short will be uncomfortable; too long will gap and sag.
• Buy Snug, Not Tight: Swimwear should fit snugly when dry because it will stretch when wet. If it feels loose in the fitting room, it will be too loose in the water. However, it shouldn't be so tight that it digs in or creates bulges.
• Consider Your Activity Level: Athletic swimwear (for lap swimming, water sports) should fit tighter and provide more support than fashion swimwear. Competition suits are designed to compress and may feel uncomfortably tight when dry—this is intentional.
• Mix and Match for Two-Pieces: Don't feel obligated to buy matching top and bottom sizes. Many women need different sizes for tops and bottoms. Look for brands that sell separates or offer mix-and-match options.
• Fabric Matters: Swimsuits with more spandex/lycra (15-20%) will have more stretch and recovery. Suits with less spandex may feel stiffer but hold their shape longer. Chlorine-resistant fabrics are essential for frequent pool swimmers.

Common Swimwear Sizing Mistakes

The biggest mistake is buying swimwear in your regular clothing size without trying it on or checking measurements. Swimwear sizing runs smaller than regular clothing—you might be a size 6 in dresses but need a size 8 or 10 in swimsuits. Another common error is not accounting for bust support in one-piece suits and bikini tops. If you're larger than a B cup, look for suits with underwire, adjustable straps, or built-in bras. Additionally, many people don't consider how swimwear will fit when wet. Lighter colors and thinner fabrics can become see-through when wet, and some materials lose elasticity after exposure to chlorine and saltwater. Finally, don't ignore the return policy—swimwear is notoriously difficult to fit, and you may need to try multiple sizes or styles.