How much calorie deficit a day to burn 5 pounds in a week?

I'm a male, 17 years old, 5 ft 8, and weigh 188lbs/86kg/13 stone 6lbs with a BMR of around 1800. Body fat percentage is 21% and my body has 32 pounds of fat.

I usually eat 1200-1600 odd calories a day and go to the gym 4-5 times a week and burn 500-1000. Judging by that, how much should I be losing a week?

I want to lose 5 lbs or more a week, I know it's deemed not to be healthy but how much calorie deficit is that for me a day?

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