Find your ideal daily water intake based on your age, gender, weight, and activity level.
Looking for a reliable Water Intake Calculator? This tool helps you determine exactly how much water your body requires each day. A healthy adult typically needs between 2 to 4 liters daily, but your personal number depends on age, gender, weight, and how often you exercise. Simply enter your details below to get a personalized hydration plan in seconds.
Type your age (1-120) into the "Age" field and select your gender (Male/Female) from the dropdown. These values adjust the core hydration formula.
Input your weight in kilograms using the "Weight" field, then choose your activity level from five options: Sedentary, Light, Moderate (default), Active, or Highly Active.
Click the purple "Calculate" button to instantly see your daily water needs. The main display shows liters, while three stat cards reveal glasses, bottles, and hourly intake. Use the "↺ Reset" button to clear all fields and start over.
Age & Gender Inputs: Adjusts baseline hydration using age-based ml/kg formulas (35 for under 30, 32 for 31-55, 30 for over 55) plus a -150ml adjustment for females.
Weight & Activity Fields: Calculates base needs from weight (kg) then adds activity bonuses from 0ml (sedentary) up to 1000ml (highly active).
Multiple Result Formats: Displays total daily water in liters, plus converted values showing glasses (250ml) , bottles (500ml) , and recommended ml per waking hour.
Hydration suggestions are incorporated: Four realistic advice (morning water, pre-meal drinking, workout add-ons, and hourly reminders) are provided to assist users in meeting their everyday objective.
Start with 500ml of water before breakfast—this tool’s tip section reminds you to hydrate early.
Drink one glass 30 minutes before each meal to improve digestion and reach your calculated target.
For every 30 minutes of intense exercise, manually add 500ml beyond what the activity level already provides.
Set hourly reminders to ensure consistent intake across 16 waking hours, corresponding to the per-hour stat value.
Uses age-adjusted ml/kg ratios (35/32/30) plus gender modifiers to provide realistic daily water intake estimates.
Adds precise hydration needs for exercise: +150ml (light), +350ml (moderate), +650ml (active), or +1000ml (highly active).
Results appear inside a gradient purple card showing liters large, followed by glasses, bottles, and hourly stats—no page reload needed.
The tool adapts perfectly to mobile screens (under 720px and 480px) with stacked grids and smaller padding for easy use on phones.
This hydration calculator doesn’t just give you one number. It answers three real-world questions at once: “How many glasses is that?” (250ml each), “How many water bottles should I drink?” (500ml each), and “How much per hour if I’m awake for 16 hours?” The stat cards update live whenever you change age, weight, gender, or activity level. For example, a 30-year-old guy who is 70 kg and moderately active may view the total liters, number of glasses, number of bottles, and hourly ml in a single, small grid.
Multiply your weight in kg by 30-35ml depending on age, then add activity bonuses. This calculator does it automatically.
Yes. This tool reduces the baseline by 150ml for females compared to males with the same age and weight.
This tool includes a “Highly Active” option adding 1000ml (1 liter) to your base for heavy training sessions.
Yes. Select “Moderate” (exercise 2-4x/week) as the default, or choose “Sedentary” for no exercise.
Eight glasses. Each glass equals 250ml, so 2 liters = 8 glasses. This calculator shows the exact number.
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