How many calories I should eat a day when I am a female / 64 kg /171 CM tall but like to be 58 kg? Thank you

BMI is normal now! At 5 foot 7 inches ; 141 pounds, your body mass index (bmi) is 22. That's absolutely normal! your goal of 127 pounds is at the borderline of underweight. Strive for healthy eating, balanced with moderate exercise, plenty of sleep, ; avoidance of empty junk food calories, tobacco, or excessive alcohol. Be well, ; don't hurt yourself!