How accurate is the "calorie burned estimator"?

Curious because it came out with about a 200 calorie difference than the site I’m about to stop using (I didn’t think it was too accurate, which is why I found this one).

Also, my abs hurt so good. c:
AND – I’ve uploaded a progress photo. It’s embarrassing, yes..But I’ve come a long way. I’m not taking another progress picture till I am completely satisfied and that lower pooch (which is getting smaller, I promise) is gone.

No calorie burned calculator is very accurate. They are all, at best, a guess. There are so many variables – your metabolism, how much effort you put into it, your current level of fitness, etc.

If I’m given two numbers, I’d probably go with the lower one.

Thank you for answering~