Based on data collected at the NIDDK (National Institute of Diabetes and Digestive and Kidney Diseases) and the NIH (National Institutes of Health), this weight loss calculator factors in how your metabolism really works to predict how long it’ll take to reach a particular weight loss goal.
Experts say that healthy weightloss can be achieved by reducing your intake (or increasing your expenditure) by 500 calories a day should lead to about 1 pound of fat loss per week (500 calories a day x 7 days = 3500 calories a week = 1 pound).
But don’t forget that the metabolism is adaptive. As you eat less, your metabolism slows! So you have to find out what is ypur current metabolic rate and how hard you’ll have to work (and how long it may take) to reach your goals. The best way to loseweight is to eat carefully and work out all your life!