Daily water intake calculator

Find out how many liters of water to drink per day based on your weight and activity.

Water per day

2.5 L

In milliliters2,450 ml

Glasses of 250 ml10

General reference (35–45 ml per kg). Hot weather, pregnancy and some conditions increase the need.

How the calculation works

A common reference is 35 ml of water per kg of body weight per day, rising to 40–45 ml/kg with more intense activity.

Do coffee and tea count?

They contribute to hydration, but plain water should be the base.

Calculate your basal metabolic rate (BMR) and how many calories you burn per day (TDEE).

Calculate your Body Mass Index (BMI) and see the WHO classification.

Updated on June 18, 2026 · by Rafael Rossi · Methodology & sources