BMR for Men=66+(13.7 X wt in kg)+(5 X ht in cm)-(6.8X age in years)
BMR for women =655+(9.6 X wt in kg)+(1.8 X ht in cm)-(4.7 X age in years).
Now multiply your BMR with activity multiplier.
Sedentary = BMR X 1.2, Lightly active = BMR X 1.375,
Moderate Active = BMR X 1.55, Very active = BMR X 1.725, Extraordinary active = BMR X 1.9.
In this way you can calculate your daily calories requirements. If you want to reduce or increase weight then put your desired weight in the weight space of the BMR formula.