BMR confusion?

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I know this is probably a fairly repetitive post, and I have read some peoples answers but it's always good to get a first hand response.

I have entered my details into online calculators and have received answers differing from 1700-2700 as my BMR.

So I guess this is a two part question,

1) Can someone please help me work out my BMR? and,

2) Do I need to eat minimum of my BMR calories per day to lose weight?

My details:

I am 5'11" and I weigh 206lb (want to get down to 169lb), I am fairly active - I walk about 30-60 minutes a day, am currently doing JM 30DS and go to the gym for 30-50minutes 3-4 times per week and play indoor netball twice a week.

Please help? :)

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