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.
If you want to lose weight, let's find out how many calories you need per day. Since there are 3,500 calories in one pound of body weight, you have to reduce your daily intake by 500 to lose one pound per week.