How Much Water Should You Drink Per Day? Personalized Hydration Guide

Many hydration recommendations are too generic to be useful. Your ideal water intake changes based on body size, physical activity, climate, sodium intake, and sweat rate.

Start With a Practical Baseline

A useful baseline is 30-35 ml of water per kilogram of body weight per day, then adjust up for exercise and hot weather.

Personal Hydration Formula

• Body Weight Baseline: 30-35 ml per kg.
• Exercise Adjustment: Add 500-1000 ml per hour of training.
• Heat Adjustment: Increase intake when humidity and temperature are high.
• Electrolyte Balance: Add sodium and potassium after heavy sweating.

Signs You Are Underhydrated

Low energy, headaches, reduced workout output, and unusually dark urine are common signals. Hydration should support daily performance, not just a target number.

Better Habit Design

Anchor water intake to existing routines: after waking, before meals, and after workouts. Tracking these anchors is easier than forcing random hourly reminders. Find your exact water requirement using our free Hydration Calculator, then make it a habit by building an automated tracking setup right inside the Health Tractal app.

Hydrate smarter, not harder

Automate your daily hydration routines with Health Tractal → Start Free

Your Action Plan

Stop guessing your hydration. Start with the 30–35 ml per kilogram formula, then adjust upward based on your activity and climate. Use our free Daily Water Intake Calculator to get your personalised baseline in under a minute.

Once you have your target, anchor it to meals and workouts. The Health Tractal hydration tracker makes it frictionless — log your intake directly from the Android home-screen widget without opening the app. See how it works →