Stop guessing your hydration.
Generic "eight glasses a day" advice fails active bodies. Track fluid balance, calculate exact sweat losses, and dial in your electrolytes with clinical precision.
The Baseline Shift
In a 2023 cohort study, 72% of endurance athletes drastically underestimated fluid loss in mild climates (15°C/59°F).
Telemetry for your fluid intake.
View all 15 tools →Sweat Rate Calculator
Determine exactly how much fluid you lose per hour of activity based on pre/post-workout weigh-ins.
Calculate →Alcohol Offset Engine
Calculate the precise water volume required to neutralize the diuretic effect of different alcoholic beverages.
Calculate →Urine Color Assessor
Compare your output against the clinical 8-point hydration scale to instantly gauge your current status.
Assess →Thirst is a lagging indicator.
By the time you feel thirsty, you are already operating at a 1-2% body weight deficit. At a 2% deficit, cognitive function declines. At 4%, muscular endurance drops precipitously.
We built WaterTrackLog because existing apps abstract hydration into cute animations of filling cups. We treat it as physiological telemetry.
- > Strict no-JS fallback calculators
- > Citations for all physiological claims
- > No account required, data lives locally
- > Absolute transparency on methodology
The Hyponatremia Risk
Over-hydrating is just as dangerous as dehydrating. In long-duration events (marathons, ultras), aggressive water intake without sodium replacement leads to Exercise-Associated Hyponatremia (EAH).
Read the safety protocol →