The US size is first and UK is second the cups are the same F is E, G is F, H is FF, I is G, J is GG, K is H,L is HH, M is J, O is JJ FREYA 4101 JOLIE UP TO G CUP UK SIZING FREYA ELEANOR 5732 BALCONY UP TO J CUP UK SIZING FANTASIE BALCONEY MARIETTE 6103 UP TO G UP UK SIZING FREYA POLLYANNA 5932 BALCONY UP TO J CUP UK SIZING FREYA RIO 3510 BALCONY UP TO H CUP UK SIZING FANTASIE MARIETTE BALCONY 6102 UP TO J CUP UK SIZING FREYA ANTOINETTE 3925 UP TP G CUP UK SIZING FREYA ANTOINETTE 3935 UP TO J CUP UK SIZING FREYA RETRO 3411 PADDED PLUNGE UP TO G CUP UK SIZING FREYA CLARISSA 3936 UP TO J CUP UK SIZING FRAYA ARABELLA PLUNGE 5721 UP TO G CUP UK SIZING FRYA ARABELLA BALCONY 5731 UP TO J CUP UK SIZING NEW FANTASIE GABRIELLE 6323 BALCONY UP G CUP UK SIZING FRYA POLLYANNA BALCONY 5932 UP TO J CUP UK SIZING FREYA ELEANOR PLUNGE 5722 UP TO G UK SIZING FREYA LAYLA 4352 BALCONY UP TO J CUP UK SIZING FREYA DAISY PLUNGE 4122 UP TO G CUP UK SIZING FREYA MIMI BALCONY 2731 UP TO J CUP UK SIZING FREYA MIMI BALCONY 2721 UP TO G CUP UK SIZING FREYA MILLIE BALCONY 5930 UP TO J CUP UK SIZING FREYA CLARISSA 3926 BALCONY UP TO G CUP UK SIZING FREYA CLAUDIA 4112 BALCONY UP TO J CUP UK SIZING FREYA CLAUDIA 4111 BALCONY UP TO G CUP UK SIZING FREYA 4192 ESTELLE BALCONY UP TO J CUP UK SIZING FREYA ESTELLE 4191 PLUNGE BALCONY UP TO G CUP UK SIZING FREYA JESSICA 4151 PLUNGE UP TO G CUP UK SIZING FREYA LAYLA 4351 BALCONY UP TO G CUP UK SIZING FREYA DECO 4234 MOULDED PLUNGE CUP TO GG CUP UK SIZING FREYA POLLYANNA 5922 PLUNGE BALCONY UP TO G CUP UK SIZING FREYA ELEANOR 5722 UP TO G CUP UK SIZING FREYA MISCHA 4011 BALCONY CUP TO GG CUP UK SIZING FREYA LUCY BALCONY 4281 UP TO G CUP UK SIZING Any questions? Please call us at 1-800-858-3887.