Hi dearchristina!! OK, as with any guy, attempting to calculate a dress size is a risky area indeed. I'll be sure to put you in one the wrong size. Calculating your dress size is better served knowing your hip, waist and bust. Don't tell me though..... I'd feel like that is too much information... I blush easy :-) Go out on Google and type in "Dress Size Calculator" in your web browser. There are a million dress size tools that will help you calculate the size you want.
Height and weight are a good start for a great guess, but plugging the rest into one of those calculators will get you the exact size (though even then there is some difference depending on personal choice, tight fit, more loose fit, etc)