Calculating Calories and Fat Grams 

To maintain your current weight, follow this formula:

To determine the number of calories and fat grams you need to consume each day in order to lose or gain weight, consult your physician or a registered dietitian. To maintain your current weight, use the following calculator.

Remember, saturated fats should account for only 10 percent of the total fat grams consumed.

http://medicalcenter.osu.edu/patientcare/healthcare_services/weight_management/general/diet/calculate_calories_fat/index.cfm