👙 Swimsuit Size Calculator 2026
Find Your Perfect Bikini & One-Piece Size
Calculate your ideal swimsuit size using bust, waist, hip, and torso measurements
How to Measure Your Swimsuit Size
Bust Measurement
Using a soft measuring tape, measure your bust at the widest part (fullest point of your chest).
Waist Measurement
Measure your waist at the narrowest part, usually around belly button height. Keep the tape comfortable, not too tight.
Hip Measurement
Measure your hips at the widest part, approximately 8 inches below your waist.
Circular Torso
For one-piece swimsuits: measure from crotch to shoulder, going over the breast, around your body. This accounts for body length and depth.
👙 Your Swimsuit Size
📋 Size Breakdown by Measurement
| Measurement | Your Value | Suggested Size |
|---|
Size Calculation Formula
Best Fit Determination
- Measure your bust at the widest part with a soft tape measure.
- Measure your waist at the narrowest point, keeping the tape comfortable.
- Measure your hips at the widest part, about 8" below waist.
- For one-piece: Measure circular torso from crotch to shoulder over breast.
- Enter measurements and get your perfect size instantly.
Swimsuit Size Chart (Standard)
| Size | US | Bust (in) | Waist (in) | Hip (in) | Torso (in) |
|---|---|---|---|---|---|
| XS | 2-4 | 32-33" | 26-27" | 35-36" | 58" |
| S | 6-8 | 34-35" | 28-29" | 37-38" | 60" |
| M | 10 | 36-37" | 30-31" | 39-40" | 62" |
| L | 12 | 38-40" | 32-34" | 41-43" | 65" |
| XL | 14 | 41-42" | 35-36" | 44-46" | 68" |
| XXL | 16 | 43-45" | 37-39" | 47-49" | 71" |
D+ Cup Size Chart
| Size | Bust (in) | Description |
|---|---|---|
| XS/D | 37-38" | Extra Small with D+ Cup support |
| S/D | 39-40" | Small with D+ Cup support |
| M/D | 41-42" | Medium with D+ Cup support |
| L/D | 44-45" | Large with D+ Cup support |
| XL/D | 46-47" | Extra Large with D+ Cup support |
| XXL/D | 48-49" | XXL with D+ Cup support |
International Size Conversion
| US | Alpha | UK | EU | AU | FR |
|---|---|---|---|---|---|
| 2-4 | XS | 6 | 34 | 6 | 34 |
| 6-8 | S | 8-10 | 36-38 | 8-10 | 36-38 |
| 10 | M | 12 | 40 | 12 | 40 |
| 12 | L | 14 | 42 | 14 | 42 |
| 14 | XL | 16 | 44 | 16 | 44 |
| 16 | XXL | 18 | 46 | 18 | 46 |
Swimsuit Fitting Tips
💡 Pro Tips for the Perfect Fit
- Between sizes? Choose the larger size for comfort in the water.
- Top and bottom differ? Many brands sell separates — mix and match!
- One-piece feels short? The circular torso measurement is key. Size up if needed.
- D+ cup? Look for styles with underwire or built-in support.
- For swimming laps: Choose snug fit; swimsuits stretch when wet.
Official Resources
Frequently Asked Questions
A well-fitting swimsuit should feel snug but not tight. Straps shouldn't dig in, the bust should be fully covered without spillage, and the bottom should cover without riding up. Move around to test the fit!
It's a measurement from your crotch, up over your shoulder (going over the bust), and back down to the crotch. This accounts for your body's length and depth, essential for one-piece swimsuits to avoid them being too short or long.
Swimsuits typically stretch when wet, so a snug fit is ideal. If between sizes, size up for lounging/fashion swimwear, but stay true to size or size down for athletic/performance swimwear.
Many brands sell bikini tops and bottoms separately! Buy the top based on your bust measurement and the bottom based on your hip measurement. This is very common.
Generally: US 2-4 = EU 34, US 6-8 = EU 36-38, US 10 = EU 40, US 12 = EU 42, US 14 = EU 44, US 16 = EU 46. Check our conversion table above for exact matches.
D+ sizing is designed for fuller busts (D cup and above). These swimsuits have more bust room, better support, often with underwire or molded cups. The body stays the same size, but bust area is roomier.
You should be able to fit two fingers under the strap comfortably. Straps should stay in place without digging in or leaving marks. Adjustable straps are best for a custom fit.
Yes! Chlorine, salt water, and sun exposure cause swimsuits to stretch and fade. To extend life: rinse after each use, hand wash with mild soap, and lay flat to dry away from direct sun.
The circular torso measurement is most important for one-pieces. It ensures the suit isn't too short (uncomfortable) or too long (saggy). If you have a longer torso, look for "long torso" styles.
This calculator is designed for women's swimwear. Men's swim trunks typically use waist measurement only. For men: XS=28-30", S=30-32", M=32-34", L=34-36", XL=36-38", XXL=38-40".
Created by OmniCalculator.space — Your trusted source for sizing calculators.
Last Updated: January 2026