If you can, find a place that will give you your RMR - which will be a similar number to your BMR but slightly less. Since even sedentary BMR accounts for
some movement like getting up to use the bathroom, going around the house a bit, or making meals. You might like the way I estimate how much I should have lost in a given week which is this: I create a deficit of 3500 calories a week from diet alone, without even factoring in exercise. If I did do any exercise that week then I add that to the 3500 deficit I already have and then divide the final number by 3500. I think it's nifty to see if the scale will reflect what I theoretically should have lost that week, but remember that there will be times when it won't be a 1:1 loss from the equation on paper and what the scale reads out