answer:2000 calories per day is seen as a general rule, but of course it varies by weight, your goals, and activity level. The only rules of thumb I know are all related in pounds, but it’s an easy conversion over to kilos. 10 calories per pound daily is about as low as you want to go to lose weight and stay healthy while doing so and 15 per pound is considered a good intake to maintain your current. So in kilos your looking at about 22 and 33 respectively. All said you probably want somewhere between about 1600 and 2000 a day depending on what your goals are. That said, your 16 and still growing, when you’re hungry, eat. Hope it helps.