I use myfitnesspal.com pretty religiously
+1 and it works great, just don’t let the defaults go without tweaking them to your specific needs (that is to say, for some people it overestimates things, like cycling calories burned, for others it under estimates things, like running calories burned).
I am slowly transitioning away from the former fat kid mentality that I need to constantly be at a large deficit, to a more realistic mindset that proper fueling equates to better performance.
+1 on this too. When I had more weight to lose, I found that I could really put myself into a pretty big deficit and survive for quite a while. I dropped from 185 to about 146 doing this without even really tracking anything and it only took somewhere less than a year. Going from 146 to 140 took a much more choreographed effort of small deficits over extended time; when I screwed up and went to deep into the tank, training sucked, I would binge, training would come back up, I wouldn’t lose any weight.
I have since learned how to manage this stuff a little better and am now in the 134 range, which is pretty darn close to what I would estimate is my ideal racing weight (I would like to try 130 to see how it goes, but as you would expect it is not easy to get there).
To get this low, I have had to manage all the details, I am creeping lower as planned, but it is a creep (less than a pound every couple weeks).
Keep in mind a few other things that affect your weight unrelated to your eating: heat acclimatization, I gained 2 pounds once it got real hot and since I was tracking my eating and training, I know that I didn’t add 2 pounds from food. It is blood plasma increase. I think this will basically last until it cools off for an extended period.
Another is inflammation. After particularly hard or long workouts, it is easy for me to gain a pound or two that is unexplained and sticks around for a couple days.
Another is edema from traveling for an extended period (like seated in one position on a plane for an extended duration). That can throw a really crazy number onto the scale for 1 maybe 2 days.
I was on a plane for about 3 hours one day last month. The scale said I gained 5 lbs from the morning before to the morning after. Next morning, I was halfway back to baseline, next day I was back to baseline.
When you record your weight in the same condition everyday (wake up, take a leak, weigh yourself), you see some really crazy stuff some time. Weigh every day, at the end of the week, look at the average over last 7 days and track that, it should remove much of the phenomenon noted above.