Bikini Calculator
Find bikini top size from bust and underbust.
Estimate bikini top size from bust and underbust in inches.
How the Math Works
The Bikini Calculator uses standard bra sizing methodology to determine your ideal bikini top size. It calculates your band size by rounding your underbust measurement to the nearest whole number, then determines your cup size by measuring the difference between your bust and underbust measurements. This difference in inches corresponds to specific cup letters (A, B, C, D, etc.), following established sizing conventions that account for body proportions and comfort standards used by lingerie manufacturers worldwide.
Practical Applications
To use this calculator effectively, simply wrap a measuring tape snugly around your ribcage just below your bust to get your underbust measurement, then measure across the fullest part of your breasts for your bust measurement. Enter these two numbers into the calculator, and it will instantly provide your recommended band size and cup size combination. For best results, have someone else take your measurements or use a mirror to ensure the tape is level and properly positioned, then compare the calculated size with your current favorite bikini top to validate the recommendation.
Day-to-Day Use
Having the correct bikini size ensures confidence and comfort at the beach or pool, eliminating the stress of ill-fitting swimwear that can shift, dig in, or create unwanted gaps. Proper sizing also extends beyond vacations - knowing your accurate measurements helps when shopping for sports bras, nursing bras, or any fitted tops, saving time and return costs while improving overall wearing experience. This knowledge empowers you to make informed purchasing decisions and advocate for your comfort needs in fitting rooms, leading to better satisfaction with every purchase.
FAQ
Bikini vs bra?
Similar sizing — bands usually a bit looser in swimwear.