MONDAY WEIGH IN

On Monday June 23, I weighed in at

147.0

Today Monday June 30, I weighed in at

147.4

WHAT?!

Just in case you're wondering, here's a recap of last weeks calories in and burned:

Mon - 30 minutes cardio, 200 calories burned, 1300 calories in
Tue - 90 minutes cardio, 579 calories burned, 1200 calories in
Wed - 74 minutes cardio, 518 calories burned, 1350 calories in
Thu - 60 minutes cardio, 415 calories burned, 1188 calories in
Fri - 0 minutes cardio, 0 calories burned, 1190 calories in
Sat - 60 minutes cardio, 412 calories burned, 1309 calories in
Sun - rest day, 1629 calories in

So my weekly total take in was: 9166.
My weekly total burned through cardio was: 2124.

I found some websites (my favorite) that calculate a rough estimate of how many calories your body needs daily to maintain normal bodily functions (called your BMR or basal metabolic rate) based on your height, weight, age and gender and they averaged around 1450 give or take a few. They then tell you a number to multiply that by to factor in your daily activity caloric needs. I factored mine at sedentary(1.2) because I sit at a desk for 8 to 10 hours a day. 1450 x 1.2 = 1740. So my body needs roughly 1740 calories daily to maintain my present body weight. That would put my weekly calorie needs at 12,180.

My body "needs" 12,180 calories. I took in 9,166. I burned, through cardio, 2124. That gives me a deficit of 5138. Since 1 pound of fat = 3500 calories, I should have lost at least a pound if not more.

Now don't get me wrong, I realize that these are all estimates and can be slightly off one way or the other but even if my deficit is off by 1500 calories I still should have lost some weight. I worked my butt off (I thought)

Can someone please explain to me why I didn't lose any weight and in fact gained some?!