With that is said, you should not be strictly tied to accurate calculations. If you find yourself feeling physically or emotionally unsatisfied, you may make them 3000-calories then make them 2500-calories towards our goal, 2000-calories/day.
To succeed to count 2000-calories/day, you should cut-down the digestible carbohydrate intake (e.g. sugar, bread, rice, pasta...etc.), so that you avoid the vicious circle of glucose/insulin/glucose..( the more glucose is in blood the more insulin is secreted and the more hungry you are, then the more you eat).
To start your journey on the way to count 2000-calories/day, you put for yourself a broad plan consisting of 2 big meals each produces 650-700-calories, and 3-4 snacks producing 150-200- calories each. Plan to eat 100 grams proteins, 50-60 grams healthy fats, and the rest of your calories ( about 1000 calories) may come from carbohydrates every day.
To succeed even better, you should deceive your body to lead to to where you want it to do, where it is satisfied and grateful with 2000-calories or less every day. You do that by increasing healthy fat intake admixed with a large amount of fibers (e.g. adding whipped cream to fruit salad, or olive oil to green salad....etc.), and then gradually decreasing the fat content, until your body is accustomed to the new calorie balance.You will be surprised with your body refusing any extras when you go with this plan persistently to its end.
The actual math calculations are not a problem at all nowadays, as almost all foods are labelled with calories and other contents, yet you can basically consider that 1 gram carbohydrate produces 4 Calories, 1 gram protein produces 5 Calories, and 1 gram fat produces 9 Calories.This plan is all about a continuous uninterrupted way of living.