List every ingredient in the recipe
Record the exact amount of each ingredient used
Find the calories per serving for each ingredient from a nutrition label or database
Convert each ingredient amount to the same unit used in the calorie source
Calculate calories for each ingredient based on the amount used
Add the calories from all ingredients together
Include calories from oils, sauces, toppings, and garnishes
Divide total calories by the number of servings to get calories per serving
Adjust for any substitutions or changes in portion size
Round the final number if needed