I want to know what is the formula to get the proper calories intake that a person need..?

just type in BMR in your search engine and that will give you the formula and will also give you a chance to enter in details such as weight and activity level which make it more accurate.

This is a good link to try

http://www.bmi-calculator.net/bmr-calculator/

Heres the one I always use and tell my friends to use.

BMR = 655 + (9.6 X weight in kilos) + (1.8 X height in cm) - (4.7 X age in years).

Notes:

1 inch = 2.54 cm.

1 kilogram = 2.2 lbs.

Example of BMR

You are 32 years old

You are 5 feet 4 inches tall (162.5 cm)

Your weight is 185 pounds (84 kilos)

Your BMR is 655 + (806) + (291) - (150) = 1602 calories

To determine your total daily calorie needs, now multiply your BMR by the appropriate activity factor, as follows:

If you are Sedentary - little or no exercise

Calorie-Calculation = BMR X 1.2

If you are Lightly Active (light exercise/sports 1-3 days/week)

Calorie-Calculation = BMR X 1.375

If you are Moderately Active (moderate exercise/sports 3-5 days/week)

Calorie-Calculation = BMR X 1.55

If you are Very Active = BMR X 1.725 (hard exercise/sports 6-7 days/week)

Calorie-Calculation = BMR X 1.725

If you are Extra Active (very hard daily exercise/sports & physical job or 2X day training)

Calorie-Calculation = BMR X 1.9

take into acount your body type and weight

id say 2300 calories

diet?

1800 calories