Excellent. Thanks! 
ETA: Wait, one more question. Mine, for example, says that I should take in 1900 cals. I know I don't eat 1900 calories a day. Maybe once a week I might, but on average, I probably eat more like 1200 calories or at the most 1500. If I shave off 500 from my number, that puts me at 1400 but that's still about the same or more than I currently eat, so I wouldn't lose weight in that case, right?
Don't I have to do 500 minutes what I currently take in and not 500 minus what I should be taking in?
The number that you got from the calorie calculator represents how many calories someone of your age (?), height, and weight should consume to maintain their current weight.
Unfortunately it doesn't account for the fact that different people have different metabolisms, so it isn't perfect. If you know that you almost never consume 1900 cals, yet your weight hasn't changed, you probably have a slow metabolism. As we age our metabolisms naturally slow down (which really stinks).
Excercise is a great way to speed up your metabolsim. Also, eat regulary. If you only eat 3 times per day (or less

) that must change! Have healthy snacks. Grab some fruit between meals, or some almonds. When you eat your metabolism speeds up to digest the food.
Be sure to eat breakfast. When you sleep you're going several hours without eating so your metabolism slows down. A healthy breakfast helps to kick start your metabolism.
I'd try incorporating some of
these tips on boosting your metabolism while deducting 500 cals from the quote you got in the calorie calculator.
If you don't lose anything, deduct more. You don't want your cals to go TOO low though. Then your metabolism crashes and you won't lose anything.