I have been using daily plate religously lately and logging my exercise and food. Do you find that the calories burned for exercise on there is accurate? I have an issue with the biking general one... They say you burn 800+ per hour for my weight. I don't see that happening. I ride my bike 39 minutes each way for work to get exercise.

They are assuming you're biking is at your optimal exercise heart rate, which I doubt happens on your commute.

Riding the bike is great for the environment and it certainly helps a little in weight loss, but unless you get off the bike feeling "beat" at least 2-3 times a week, then you are doing little to improve your overall fitness. Your body will adjust to an exercise load that becomes too routine. Shock your body and you will notice results.

I would be wary to just accept what one of these calculators says as fact. Take it as a rule of thumb and nothing more. I use fit tools at FitFiend.com and I just use them to gauge myself but not as an absolute. Maybe you should get a heart rate monitor...it would be way more accurate.