I echo Sharrelle's advice. You are smack dab in the middle range for your height and censored.
You may have come across a height/weight chart with a lower number...those charts (which are basis for those internet calulators as well) are out of date according to the latest research. They continued to be preferred by the weight loss money making industry because it defines more people as protential customers. The best charts to use are those that don't just have one number attached to your height. People vary from each other (for example, if you have more muscle than average - you will weight more than average...as you see heavier doesn't always mean fatter!), so a chart that deals in a range of weight is a better guide. Besides nobody stays at a exact weight all the time. Indeed your body at any given time of day will weight differently than another time of that same day.
If you have issues with the way your body looks then I suggest that firstly you get a reality check on what "normal" looks like. Clue - supermodels are not normal! They are underweight and unhealthy (and assisted by Photoshop). Secondly, if its a case of feeling a bit flabby why not commit to some exercise to tone up. You may put on a few kilos of muscle but you will look healthy and terrific.
Now: keeping it off for life!