Weigh the food
Check the nutrition label for calories per serving
Measure the serving size you ate
Multiply calories per serving by the number of servings consumed
Use a food scale for more accuracy
Use a calorie tracking app or database for foods without labels
Add calories from all ingredients in a recipe
Divide total recipe calories by the number of portions
Include drinks, sauces, oils, and condiments
Sum all calories eaten in a day to get total daily calories