{ "name": "International Bra Size Conversion Reference", "reviewed": "2026-07-10", "license": "CC BY 4.0", "source": "https://shapefinder.app/bra-size-conversion-reference/", "methodology": "Deterministic arithmetic per published industry sizing conventions; verifiable against any retailer size chart; consistent with the site's own calculator methodology. Nothing is measured, sampled or estimated.", "columns": [ "record_type", "uk_band", "us_band", "eu_band", "fr_es_be_band", "bust_minus_band_in", "us_cup", "uk_cup" ], "rows": [ { "record_type": "band_conversion", "uk_band": 28, "us_band": 28, "eu_band": 60, "fr_es_be_band": 75, "bust_minus_band_in": "", "us_cup": "", "uk_cup": "" }, { "record_type": "band_conversion", "uk_band": 30, "us_band": 30, "eu_band": 65, "fr_es_be_band": 80, "bust_minus_band_in": "", "us_cup": "", "uk_cup": "" }, { "record_type": "band_conversion", "uk_band": 32, "us_band": 32, "eu_band": 70, "fr_es_be_band": 85, "bust_minus_band_in": "", "us_cup": "", "uk_cup": "" }, { "record_type": "band_conversion", "uk_band": 34, "us_band": 34, "eu_band": 75, "fr_es_be_band": 90, "bust_minus_band_in": "", "us_cup": "", "uk_cup": "" }, { "record_type": "band_conversion", "uk_band": 36, "us_band": 36, "eu_band": 80, "fr_es_be_band": 95, "bust_minus_band_in": "", "us_cup": "", "uk_cup": "" }, { "record_type": "band_conversion", "uk_band": 38, "us_band": 38, "eu_band": 85, "fr_es_be_band": 100, "bust_minus_band_in": "", "us_cup": "", "uk_cup": "" }, { "record_type": "band_conversion", "uk_band": 40, "us_band": 40, "eu_band": 90, "fr_es_be_band": 105, "bust_minus_band_in": "", "us_cup": "", "uk_cup": "" }, { "record_type": "band_conversion", "uk_band": 42, "us_band": 42, "eu_band": 95, "fr_es_be_band": 110, "bust_minus_band_in": "", "us_cup": "", "uk_cup": "" }, { "record_type": "band_conversion", "uk_band": 44, "us_band": 44, "eu_band": 100, "fr_es_be_band": 115, "bust_minus_band_in": "", "us_cup": "", "uk_cup": "" }, { "record_type": "cup_rule", "uk_band": "", "us_band": "", "eu_band": "", "fr_es_be_band": "", "bust_minus_band_in": "<1", "us_cup": "AA", "uk_cup": "AA" }, { "record_type": "cup_rule", "uk_band": "", "us_band": "", "eu_band": "", "fr_es_be_band": "", "bust_minus_band_in": "1", "us_cup": "A", "uk_cup": "A" }, { "record_type": "cup_rule", "uk_band": "", "us_band": "", "eu_band": "", "fr_es_be_band": "", "bust_minus_band_in": "2", "us_cup": "B", "uk_cup": "B" }, { "record_type": "cup_rule", "uk_band": "", "us_band": "", "eu_band": "", "fr_es_be_band": "", "bust_minus_band_in": "3", "us_cup": "C", "uk_cup": "C" }, { "record_type": "cup_rule", "uk_band": "", "us_band": "", "eu_band": "", "fr_es_be_band": "", "bust_minus_band_in": "4", "us_cup": "D", "uk_cup": "D" }, { "record_type": "cup_rule", "uk_band": "", "us_band": "", "eu_band": "", "fr_es_be_band": "", "bust_minus_band_in": "5", "us_cup": "DD (some brands: E)", "uk_cup": "DD" }, { "record_type": "cup_rule", "uk_band": "", "us_band": "", "eu_band": "", "fr_es_be_band": "", "bust_minus_band_in": "6", "us_cup": "DDD / F", "uk_cup": "E" }, { "record_type": "cup_rule", "uk_band": "", "us_band": "", "eu_band": "", "fr_es_be_band": "", "bust_minus_band_in": "7", "us_cup": "G", "uk_cup": "F" }, { "record_type": "cup_rule", "uk_band": "", "us_band": "", "eu_band": "", "fr_es_be_band": "", "bust_minus_band_in": "8", "us_cup": "H", "uk_cup": "FF" } ], "band_conversion": [ { "uk_band": 28, "us_band": 28, "eu_band": 60, "fr_es_be_band": 75 }, { "uk_band": 30, "us_band": 30, "eu_band": 65, "fr_es_be_band": 80 }, { "uk_band": 32, "us_band": 32, "eu_band": 70, "fr_es_be_band": 85 }, { "uk_band": 34, "us_band": 34, "eu_band": 75, "fr_es_be_band": 90 }, { "uk_band": 36, "us_band": 36, "eu_band": 80, "fr_es_be_band": 95 }, { "uk_band": 38, "us_band": 38, "eu_band": 85, "fr_es_be_band": 100 }, { "uk_band": 40, "us_band": 40, "eu_band": 90, "fr_es_be_band": 105 }, { "uk_band": 42, "us_band": 42, "eu_band": 95, "fr_es_be_band": 110 }, { "uk_band": 44, "us_band": 44, "eu_band": 100, "fr_es_be_band": 115 } ], "cup_rules": [ { "diff_in": "<1", "us_cup": "AA", "uk_cup": "AA" }, { "diff_in": "1", "us_cup": "A", "uk_cup": "A" }, { "diff_in": "2", "us_cup": "B", "uk_cup": "B" }, { "diff_in": "3", "us_cup": "C", "uk_cup": "C" }, { "diff_in": "4", "us_cup": "D", "uk_cup": "D" }, { "diff_in": "5", "us_cup": "DD (some brands: E)", "uk_cup": "DD" }, { "diff_in": "6", "us_cup": "DDD / F", "uk_cup": "E" }, { "diff_in": "7", "us_cup": "G", "uk_cup": "F" }, { "diff_in": "8", "us_cup": "H", "uk_cup": "FF" } ], "sister_size_examples": [ { "size": "32B", "band_down": "30C", "band_up": "34A" }, { "size": "32C", "band_down": "30D", "band_up": "34B" }, { "size": "34B", "band_down": "32C", "band_up": "36A" }, { "size": "34C", "band_down": "32D", "band_up": "36B" }, { "size": "34D", "band_down": "32DD", "band_up": "36C" }, { "size": "36C", "band_down": "34D", "band_up": "38B" }, { "size": "36D", "band_down": "34DD", "band_up": "38C" }, { "size": "38C", "band_down": "36D", "band_up": "40B" } ], "shapewear_dress_size_map": { "note": "typical mapping only — varies by brand; always defer to the brand's own chart", "rows": [ { "shapewear_size": "XS", "typical_us_dress": "0-2" }, { "shapewear_size": "S", "typical_us_dress": "4-6" }, { "shapewear_size": "M", "typical_us_dress": "8-10" }, { "shapewear_size": "L", "typical_us_dress": "12-14" }, { "shapewear_size": "XL", "typical_us_dress": "16-18" }, { "shapewear_size": "2XL", "typical_us_dress": "20-22" }, { "shapewear_size": "3XL", "typical_us_dress": "24-26" } ] }, "formulas": { "us_band": "US band = UK band", "eu_band": "EU band = 60 + 5 * (UK band - 28) / 2", "fr_es_be_band": "FR/ES/BE band = EU band + 15", "cup": "one cup letter per inch of bust minus band; <1in = AA; UK/US ladders diverge after DD (UK: DD,E,F,FF,G / US: DD,DDD/F,G,H)", "sister_size": "band -1 step with cup +1 letter (or the reverse) keeps cup volume constant" } }