8 glasses a day? Some percentage of your body weight? 1.5 bottles every hour when the temperature is over 80 degrees? 2 bottles when you're at altitude and it's hot? About 1 bottle/hour when it's cold. It's hard to keep it all straight. So now the folks at Camelbak are doing it for you. Before you head out for a run, ride, hike, ski or whatever, use their simple calculator to help you fill up those bottles. Here's a preview of how simple The Camelbak Hydration Calculator is: Step 1:

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Step 2: Screen Shot 2014-01-16 at 8.39.31 AM

Step 3:

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Step 4:

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Results!

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Need some hydration to put in those bottles? Shop our Camelbak products, here.