Nutrition
Body Mass Sweat Loss Formula
The body mass sweat loss formula converts pre/post weigh-ins and fluids into liters lost per hour—retest in race heat, not only cool training.
The body mass sweat loss formula is: sweat rate (L/h) equals pre-exercise weight minus post-exercise weight plus fluids consumed, divided by session hours, with weights in kilograms. A two-kilogram drop in a two-hour run without drinking is about one liter per hour.
Convert pounds by dividing by 2. 2 before the same math.
Repeat in race-like heat.
Common questions
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Can you use pounds in the sweat loss formula?
Yes—convert net pound loss to kilograms (divide by 2.2) before dividing by hours, or use pounds per hour then convert liters (1 kg ≈ 1 L).
Related terms
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