Which do I use??

I use www.mapmyrun.com to track my runs (miles, pace, mph, etc.)

I use www.nutridiary.com to track my food, log my workouts, etc. which gives me a good idea where I am at with my expenditure vs. intake. I've used it since two weeks  pre-op, and swear by it.

Here is my dilema:  Logged todays workout, which equated to about 1000 cal. in "the bank" on my nutridiary. HOWEVER, when I logged my run on my mapmyrun training log...it shows a 713 calorie expenditure.  NO CLUE AS TO WHY THE DIFFERENCE! 

Is it because my pace got quicker? I don't get it.  This was my fastest pace to date 9:13.  I have always thought the rule was basically 100 calories per one mile if you were in your upper heart rate zone.

*sigh*  Not sure which one to go with!  Your thoughts?

Kathy

Do both use your age, height, weight, gender??? If not, I would trust the one that DOES...

I wouldn't trust either of them. If they aren't using your HR in the calculations, then they are just guessing based on averages and both could be wrong.

I use a number of sources that I calibrate against my HRM when I remember to wear it. Then I put in the amount that seems reasonable based on all the sources and what I've seen from my HRM in the past.

It's all just a guessing game unless you have tested resting metabolic rate
Here is some info on that: http://www.caloriesperhour.com/help_burn_accurate.php
It talks about how things vary and what is more accurate etc.

I look at several of them, then generally I take the one that is the lowest as long as it isn't too far off.
So I would probably have chosen the 713 calorie one.

I think most of the machines or programs over estimate the burn.

Scott

I have heard to take 70% of your body weight and multiply that per mile. That has always made sence to me. It factors in size and intensity.