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Water Tracker & Hydration Log

Calculate your ideal daily water intake and get a personalized drinking schedule to help you build a consistent hydration habit.

Settings

Achievements

Current Streak
0 Days
0% Daily Goal
Completed 0 ml
Target 2500 ml

Log Water

Click to quickly add to your daily intake.

Smart Schedule

Auto-generated based on wake/sleep times

Hydration Science

Understand why tracking your water intake is crucial for long-term health.

Cognitive Performance

The brain is ~73% water. Even a 2% drop in hydration causes noticeable reductions in focus, memory, and cognitive speed, often mistaking thirst for afternoon fatigue.

Physical Endurance

Proper hydration lubricates joints, reducing friction and pain. Muscles deprived of adequate electrolytes and water are far more prone to cramping and fatigue.

Sipping vs. Chugging

Your kidneys can only process about 800-1000ml of water per hour. Sucking small, steady sips throughout the day is significantly more effective than chugging large amounts at once.

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Education

How Your Hydration Target and Schedule Are Built

01

The Daily Target Formula

Your baseline target starts at weight in kilograms multiplied by 35 ml, then is adjusted by gender (+300 ml for men, −100 ml for women), activity level (+400 ml moderate, +800 ml active), and climate (−200 ml cold, +300 ml warm, +600 ml hot). The final number is clamped between 1,500 ml and 8,000 ml per day to keep results within a sensible range.

02

Building the Drinking Schedule

Using your wake-up and sleep times, the tracker divides that window into 6 roughly even milestones, from morning wake-up hydration through a light pre-sleep glass, each targeting about one-sixth of your daily goal. This spacing helps you hydrate steadily throughout the day instead of drinking large amounts at once.

03

Worked Example

A 70 kg man with a moderately active lifestyle in a warm climate gets a baseline of 70 × 35 = 2,450 ml, plus 300 ml (male) plus 400 ml (moderate activity) plus 300 ml (warm climate), totaling 3,450 ml per day. Spread across 6 milestones, that is about 575 ml per checkpoint.

04

Logging and Related Tools

Your logged intake, streaks, and milestones are saved locally in your browser so you can track hydration day to day. For a more detailed breakdown that factors in exercise duration, pregnancy, or breastfeeding, use the Water Intake Calculator, or pair your hydration habits with the TDEE Calculator for full daily energy planning.

Good to know

Questions, answered

Quick answers about how this tool works.

Your baseline is calculated using your weight (roughly 35ml per kg or half your weight in ounces). Adjustments are made based on your gender, activity level, climate, and fitness goals to provide a personalized daily target.

By entering your wake-up and sleep times, the tracker spaces out your daily target into manageable hourly or milestone-based drinking intervals, ensuring you hydrate steadily without overloading your kidneys.

Yes! Your hydration logs, daily streaks, and milestones are saved securely in your browser's local storage. No data is sent to or stored on external servers.

The standard recommendation is about 2.5 to 3 liters (8-10 glasses) per day, but individual needs vary based on weight, activity, and climate.

Yes, consuming excessive water in a short time can cause water intoxication (hyponatremia). Consume water steadily throughout the day.

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