📌 Overview

Estimate how much water you should drink per day based on body weight, activity level and climate. A simple nudge toward better hydration.

💧 Daily Water Intake Calculator

Estimate how much water you should drink per day based on body weight, activity level and climate. A simple nudge toward better hydration.

Weight (kg)

Activity

Hot / humid climate

Enter weight to estimate water needs.

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Is this a strict medical rule?

No. It is a general guideline based on weight and lifestyle. Individual needs vary with health, diet and environment.

Does coffee or tea count?

Roughly yes, though caffeinated drinks have a mild diuretic effect. Most of your intake should be plain water.

Why does activity increase needs?

Exercise and heat increase fluid loss through sweat, so the body needs more water to stay balanced.

Is this a strict medical standard?

No - it is a general recommendation based on weight and lifestyle; individual needs vary with health, diet, and environment.

Do coffee and tea count?

Roughly yes, but caffeine has a mild diuretic effect, so most intake should still come from plain water.

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Hydrate around workouts.

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Adjust for summer heat.

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Build a daily habit.

Many people are chronically under-hydrated, and thirst lags behind the body's actual need. A weight-based estimate gives an actionable daily target.

A common baseline is weight in kg times 35ml, then add about 500ml each for activity level and hot climate, giving the daily recommended intake.

Weight 70kg, moderate activity, not hot: 70 times 35 equals 2450ml, plus 500ml for activity - about 3 liters per day.