After estimating your BMR, a reduction of 20% is a good range.
Also, Yov is right about the calorie calculators/everyone being different. The main thing to remember with any rmr formula is that is in an estimate, and may not necessarily be right on the money for you.
The Harris-Benedict and Miftlin-St.Joer (sp) equations are both widely used, and can give you a decent starting point. Just don't live and die by the exact numbers.
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