Here are some links to sites with great calculators of all sorts:

Fat Burn ~ Click on 'Free Tools' in the left-hand column

Hydration Calculator  ~ Check this out to see if you are getting enough water each day!

Fitness Testing ~ Pretty much any calculator you would want is here



And here are a couple you can play with here:

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Try this Calorie Burning Calculator...simple to use!! 
(New browser will open when you click 'GO!')

Calorie Burning Calculator

Your weight (in lbs.):

Duration of activity (in min.):

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