If you intake 1000 calories a day how many calories do you need to burn?

In every case to lose weight, we need to burn more calories actually what we had consumed. If you want to lose 3kg in a month, you need to burn more than 1000calories. Any ways 1000 calories is not at all healthy to consume, by taking 1000 calories you can lose weight very fast in earlier days. But the weight all you are reducing from your muscle and water levels in your body. By consuming 1500-1700 calories also you can lose 3 kgs in a month. Try to add some more calories to your daily meals.