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Water Intake Calculator

Estimate how much water you should drink each day based on your body weight and exercise.

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How to use the Water Intake

Fill in each input field with your own numbers.
Results calculate automatically and update as you change any value.
Read the result cards below the inputs for the full breakdown.
Adjust any field to explore different scenarios instantly.

Privacy: this tool runs entirely in your browser. Your input is never sent to, received by, or stored on any server — there are no uploads and no tracking of what you enter.

About Water Intake

Why hydration matters

Water supports nearly every function in your body. A common guideline is around 33 ml per kilogram of body weight, with extra to replace fluid lost during exercise.

How to use it

Choose metric or imperial, enter your weight and your daily exercise minutes, and the tool estimates your intake in liters, cups and fluid ounces.

A guide, not a rule

Needs vary with climate, altitude, health conditions, pregnancy and diet (food provides water too). Use this as a starting point and listen to your body.

Frequently asked questions

How much water should I drink a day?

Roughly 33 ml per kg of body weight, plus more for exercise — this tool estimates it for you.

Does coffee or tea count?

They contribute to fluid intake, though water is best for consistent hydration.

Can I drink too much water?

Rarely, but excessive intake can be harmful; the estimate here is a sensible everyday guide.