A low-calorie diet is a diet where you consume fewer calories than your body uses.
That is, if your body burns 2500Kcal and eats only 2000Kcal, you are following a hypocaloric regimen.
What a low-calorie diet is for you may not be for your colleague next door.
It is important to know the calories you use daily, since person A can spend 2000Kcal daily and person B 3000Kcal daily, a diet of 2500Kcal will be hypercaloric to person A and hypocaloric person B.
Low-calorie diets are used to lose fat/weight.
A hypercaloric diet is the opposite of a low-calorie diet, meaning you'll consume more calories than your body uses.
If your body burns 2500Kcal daily and consumes 3000Kcal, you are following a hypercaloric approach.
The same example of low-calorie feeding can be applied here, individual A spends 2000Kcal per day and individual B spends 3000Kcal per day on a 2500Kcal diet, individual A will be following a hypercaloric regimen and individual B spends a hypocaloric regimen.
Hypercaloric diets are used to gain muscle mass/weight.
To calculate an average of the calories your body uses daily, use this formula.