Bikini Size Calculator
Translate your bust, waist, and hip measurements into bikini top and bottom recommendations, plus coverage advice tailored to your shape.
Measure at the fullest part of your bust while wearing a supportive bra.
Measure at the narrowest point of your natural waist.
Measure around the fullest part of your hips and seat.
Top Size
M (Medium support with balanced coverage)
Bottom Size
L (Larger bust/hips, opt for supportive tops)
Fit Tips
Look for supportive cup sizing and adjustable ties with fuller coverage bottoms.
How to Use This Calculator
Take accurate measurements
Use a soft tape measure and note bust, waist, and hip circumference while standing straight.
Enter the numbers in inches
If you measure in centimeters, divide by 2.54 to convert to inches.
Review top and bottom recommendations
The calculator suggests a starting point. Always try on different styles for best comfort and support.
Formula
Size Category = measurement → nearest range in size chart
Curve ratio: max(Bust ÷ Waist, Hips ÷ Waist)
Coverage tip: Based on curve ratio ranges (less than 1.1, 1.1–1.2, 1.2+ etc.)
Example: Bust 35", Waist 28", Hips 38" → Top size M, Bottom size M/L, ratio 38 ÷ 28 = 1.36 → Recommendation: supportive tops, mid-rise bottoms.
About the Bikini Size Calculator
Swimwear sizing varies widely. This tool standardizes your measurements against general size bands, giving you a reliable starting point and coverage suggestions before you shop or sew.
When to Use This Calculator
- Online shopping: Compare retailer size charts with your measurements.
- Custom sewing: Select pattern sizes and adjust grading between top and bottom.
- Beach trips: Plan multiple suits with different coverages.
- Body changes: Track measurement updates between seasons.
Why Use Our Calculator?
- ✅ Measurement-driven: Avoid guessing based on clothing size alone.
- ✅ Top & bottom suggestions: Handles mixed sizing if bust and hips differ.
- ✅ Coverage ideas: Tailored recommendations based on proportions.
- ✅ Mobile friendly: Use on your phone while shopping.
Common Applications
Personal shoppers: Recommend styles that match clients’ proportions.
Pattern makers: Create graded bikini patterns referencing measurement ratios.
Retail associates: Guide customers to the right starting size in fitting rooms.
Tips for Best Results
- Take measurements while wearing minimal clothing for accuracy.
- Consider adjustable tops/bottoms if bust and hip recommendations differ widely.
- Use curve ratio insight to choose supportive styles when needed.
- Always consult the brand’s specific size chart—ranges vary by manufacturer.
Frequently Asked Questions
Why are my top and bottom sizes different?
Many people have different bust and hip proportions. Mix-and-match bikini sets let you choose separate top and bottom sizes.
Can I convert to European or UK sizes?
Use the suggested letter size or bust/hip measurement to reference the brand’s international chart. This calculator provides a US-style starting point.
How often should I re-measure?
Measure at the start of each swim season or after weight changes to keep your fit accurate.
Does this work for one-piece suits?
Yes—the top/bottom recommendations help you choose sizes for one-piece suits with built-in bust support and hip coverage.