Bikini Calculator

Calculating accurate swimwear dimensions mitigates the risk of structural failure, inadequate tissue support, and accelerated elastic degradation. Standardized apparel sizing matrices often fail to account for the volumetric differential between the thorax and the bust, leading to improper tension distribution across bikini tops. This calculator utilizes anthropometric differentials to compute standard international band and cup sizes, translating raw geometric data into exact localized manufacturing sizes.

By quantifying the ratio of underbust to overbust circumference, the algorithm determines the specific cup volume required. Furthermore, bottom sizing logic evaluates both iliac crest (waist) and trochanteric (hip) circumferences. To prevent compressive restriction and poor fit, the algorithm automatically defaults to the larger size index whenever a sizing discrepancy exists between the waist and hips. Computations assume standard elastane/spandex textile stretch thresholds of 15% to 20%.

The cup volume differential is calculated using the linear equation:

Where V represents the volumetric index, B is the maximum bust circumference, and U is the underbust circumference measured at peak expiration. The EU band size is derived by applying mathematical rounding to the nearest standard anchor point:

Sister sizing logic relies on inverse proportions: increasing the band anchor by 1 step requires decreasing the cup volume index by 1 step to maintain static structural volume.