Daily Water Intake Calculator

Find out how many litres of water you should drink per day based on your weight and activity level.

Runs in browser
Daily water intake
—
litres / day

How Is It Calculated?

W = kg × 35 ml × factor

Base: 35 ml per kg of body weight. +15% for medium activity, +30% for high activity.

How to use?

  1. 1
    Enter body weightType your weight in kilograms.
  2. 2
    Select activity levelChoose low, medium, or high based on your daily physical activity.
  3. 3
    Read the resultYour recommended daily water intake in litres is shown.

FAQ

How much water should I drink per day?
The general guideline is 35 ml per kg of body weight. A 70 kg person needs about 2.5 litres per day. Activity, climate and health conditions can increase this.
Does coffee or tea count?
Moderate amounts of coffee and tea contribute to hydration. However, they have mild diuretic effects, so pure water remains the best source.
What happens if I drink too little?
Dehydration causes fatigue, headaches, difficulty concentrating and reduced physical performance. Even mild dehydration (1–2%) affects cognitive function.

How Much Water Should You Drink?

Water makes up about 60% of the adult body. Staying hydrated supports digestion, circulation, temperature regulation and cognitive function.

Comments