yes, you are doing the math totally wrong. while it's possible for your weight and your your bmr to be just one added zero away, it's a rare enough occurrence that you should not be relying on it. it's kind of like if your shoe size is the same number as the circumference [in inches] of your wrist. sure it's a happy coincidence, but it doesn't really have anything to do with anything.
use the link jen provided you with to use an actual formula [yep, you actually have to do math, not just add a zero here or there] to get where you are. because your height and age factor in in addition to your weight.
in other words, if you are 5'6" and 30, then your bmr is 1654. if you were 20, your bmr would be 1704. if you were 50, you're down to 1556.
if you are 5' tall and 30, your bmr would be 1559. at 20 you'd be around 1608 and at 50 you'd be 1461.
if you were 6' tall you would be 1750 at 30, 1799 at 20 and 1651 at 50.
if you really don't like math, just head to your start page, make sure your goals are accurate for where you are and save. then head in to your calories burned, make sure that number is accurate for what you do in a week and save. your calorie ranges will be tailored to where you are with no math required.
-google first. ask questions later.