Exercise Hydration Loss Calculator Required Data Entry Weight Before Exercise (No Clothing) pounds Weight After Exercise (No Clothing) pounds     Calculated Results Exercise Weight Loss pounds Exercise Water Loss fluid ounces Body Weight Loss percent 0% Normal heat regulation and performance 1% Thirst is noticed, thermoregulation during exercise is altered, performance degrades 2% Further decrease in thermoregulation, increased thirst, worsening performance 3% All factors negative increased, dry mouth thirst 4% Exercise performance cut by 25 to 40% 5% Headache, weakness, incoherent feeling, irritability, fatigue 6% Weakness, nausea, severe loss of thermoregulation 7% and above - Unhealthy and not suggested