The definition of injustice is something that is not fair or just. An example of injustice is when an innocent person is sent to jail for a crime he did not commit. the quality of being unjust or unfair; lack of justice. an unjust act; injury.
That means that you don't exercise on a regular basis. The calorie calculator may say that you need to eat 1,200 calories per day to lose weight. But you don't think that you can cut enough food from your diet to reach that number. That's okay.
Once you figure out how many calories you need to sustain your current weight, subtract 250 to 500 calories per day to figure out what you need to lose weight. For instance, if you are underweight with a low activity level, multiply your weight by 16 to see how many calories you need to sustain your weight.