Bikini Size Calculator | Find Your Perfect Swimwear Fit
Calculate your bikini size with our accurate measurement tool. Convert between US, UK, EU sizes and get perfect fit recommendations.
The Bikini Size Calculator is your perfect companion for finding the ideal bikini fit based on your body measurements. This tool helps you determine the correct bikini top, bottom, and one-piece sizes across different international sizing systems, ensuring comfort, support, and confidence.
What is a Bikini Size Calculator?
A Bikini Size Calculator is a specialized measurement tool that converts your body measurements into appropriate bikini sizes according to various international standards. It considers bust, underbust, waist, hip measurements, and cup size to recommend the perfect fit for bikini tops, bottoms, and one-piece swimsuits.
Measurement Guidelines
Essential Measurements:
Bust: Measure around the fullest part of your bust
Underbust: Measure directly under your bust
Waist: Measure at the narrowest part of your torso
Hips: Measure around the fullest part of your hips
Cup Size: Calculate from bust and underbust difference
Key Features
- Multi-System Support: Convert between US, UK, EU, AU, and International sizes.
- Complete Measurement Analysis: Get separate recommendations for top, bottom, and one-piece.
- Visual Size Comparison: See how sizes compare across different regions.
- Body Type Recommendations: Get personalized suggestions based on your measurements.
- Store Size Finder: Find your size in popular swimwear brands.
- Measurement History: Save your measurements for future reference.
- Mobile Responsive: Works perfectly on all devices including desktops, tablets, and smartphones.
International Size Conversion
Top Size Systems
Bra sizes differ significantly between countries. US uses 34B, UK uses 34B, EU uses 75B, and AU uses 12B for similar measurements.
Bottom Size Systems
Bikini bottoms use dress sizing or specific swimwear sizing. Our calculator converts between all major systems.
One-Piece Sizing
One-piece swimsuits often follow dress sizing but with specific fit considerations for length and torso measurements.
Automatic Conversion
Enter your measurements once and get instant conversions to all major sizing systems worldwide.
How Bikini Sizing Works
Calculation Process
- Enter Measurements: Input bust, underbust, waist, and hip measurements
- Select Units: Choose between inches or centimeters
- Calculate Cup Size: Automatically determine cup size from bust-underbust difference
- Get Recommendations: Receive size suggestions for top, bottom, and one-piece
- Compare Systems: View your size across different international standards
- Save Results: Store your measurements for future shopping
Common Size Chart Reference
| US Size | Bust (in) | Waist (in) | Hips (in) | EU Size |
|---|---|---|---|---|
| XS | 32-33 | 24-25 | 34-35 | 34 |
| S | 34-35 | 26-27 | 36-37 | 36-38 |
| M | 36-37 | 28-29 | 38-39 | 40 |
| L | 38-39 | 30-31 | 40-41 | 42 |
| XL | 40-41 | 32-33 | 42-43 | 44 |
Cup Size Determination
Cup Size Chart
- AA: Less than 1 inch difference
- A: 1 inch difference
- B: 2 inch difference
- C: 3 inch difference
- D: 4 inch difference
- DD/E: 5 inch difference
- DDD/F: 6 inch difference
- G: 7 inch difference
Band Size Calculation
- Underbust: Measure snugly under bust
- Even Number: Add 4 inches (US/UK)
- Odd Number: Add 5 inches (US/UK)
- EU Band: Underbust in cm rounded to nearest 5
- AU Band: Different calculation system
Swimwear Fit Tips
Top Fit Guidelines
Bikini tops should provide support without digging. Straps shouldn't slip, and underwire should sit flat against your chest. For larger busts, look for wider straps and stronger support.
Bottom Fit Guidelines
Bottoms should stay in place without riding up or digging. Consider coverage preference: Brazilian, cheeky, moderate, or full coverage. Seam placement affects appearance under clothing.
One-Piece Guidelines
Consider torso length when choosing one-pieces. Look for ruching or shirring for flattering fit. Test range of motion to ensure comfort during swimming and activities.
Important Considerations
- Measure without clothing for most accurate results
- Use a flexible measuring tape at correct tension
- Different brands may have different sizing standards
- Consider fabric stretch when selecting sizes
- Body measurements can change over time - remeasure periodically
- When in between sizes, consider your fit preference (tight vs relaxed)
Frequently Asked Questions
How often should I remeasure for swimwear?
Remeasure every 6-12 months or after any significant weight change (5+ lbs). Body composition can change due to exercise, diet, age, or hormonal factors.
Why do sizes vary between brands?
Each brand uses its own fit models, sizing standards, and design philosophies. Some brands run small, others run large. Always check brand-specific size charts when shopping.
What if my measurements indicate different sizes for top and bottom?
This is common! Many women wear different sizes for top and bottom. Look for brands that offer separates or mix-and-match options. Our calculator provides both sizes separately.
How do I measure myself accurately?
Stand straight, breathe normally. Keep tape parallel to floor, snug but not tight. Have someone help for most accurate bust and back measurements. Use a mirror to ensure proper positioning.
This bikini size calculator provides general size recommendations based on standard sizing charts. Individual fit may vary based on body shape, brand sizing, fabric stretch, and personal preference. Always refer to specific brand size charts when making purchases. For the best fit, consider trying on multiple sizes or consulting with professional fitters.