Using a calorie estimator can be extremely helpful when losing weight. The science of calories will help you target the exact amount for you to eat in order to lose a safe amount of weight. As long as you're sticking to your target numbers it's just a matter of time until you arrive at your goal or at a comfortable weight. Let's get started!

The first step is to determine how many calories will sustain your current weight. This number is important to determine because if you're overweight you may be used to eating too many calories. The first step is to determine the amount of calories that will allow you to hold steady, or your basal metabolic rate (BMR). This number will be different for everyone.

Step 1: Calculate your BMR number

Men: 66 + (6.3 x weight in pounds) + (12.9 x height in inches) - (6.8 x age in years)
Women: 655 + (4.3 x weight in pounds) + (4.7 x height in inches) - (4.7 x age in years)

Step 2: Calculate your modifier number
-If you not very active or are sedentary, use your BMR number x 20%
-If you have a light level of activity, use your BMR x 30%

-If you are fairly active and exercise most days during the week, use your BMR x 40%

-If you have a high level of activity, which means strong activity every day, use your BMR x 50%