Free tool

Sweat Loss Calculator

Weigh your athlete before practice and again straight after. The difference is fluid they sweated out, not body weight - and it tells you exactly how much to put back.

Enter both numbers and we will tell you what to drink and what to eat to recover.

Nothing you type here is saved or sent anywhere - it is worked out in your browser and disappears when you close the page. This is general guidance for healthy athletes, not medical advice. Anything specific to your child belongs with your pediatrician, a registered dietitian or a certified athletic trainer.