SIZE CONVERSION SIMPLIFIED: Wrap a tape measure around your torso just below the bust to find your band size. If you get an odd measurement, round it up to the next even number. Next, measure the fullest area of your bust to find your bust size. To calculate your cup size, subtract your band size from your bust size. Did you know that Freya is available in UK sizes as well? Be sure to consult the brand's size chart for converting from US to UK sizes.