256 Tools

Water Intake Calculator

Per day
2.7 L
Milliliters
2,660 ml
Cups (250 ml)
11

This is a general estimate, not medical advice. Needs vary by person, health and conditions.

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Estimate how much water to drink each day based on your weight, daily exercise and climate. The result is shown in liters, milliliters and 250 ml cups. It is a general guide, not medical advice, and runs entirely in your browser.

How to use

  1. Choose units and enter your weight.
  2. Add your typical daily exercise in minutes and pick your climate.
  3. Read your estimated daily water target.

How it works

The base estimate is about 33 ml of water per kilogram of body weight. Exercise adds roughly 350 ml for every 30 minutes of activity, since you lose fluid through sweat. A hot climate increases the total a little and a cold one slightly less. The result is a starting point, not a strict rule.

A glass of water partly filled.

Features

Weight-based

Scales the baseline to your body weight.

Activity adjustment

Adds water for the exercise you do each day.

Climate factor

Nudges the total up in hot weather and down in cold.

Metric & imperial

Enter weight in kilograms or pounds.

When to use it

Daily goal

Set a sensible hydration target to aim for.

Workout days

See how much more to drink on active days.

Hot weather

Adjust your intake when it is hot outside.

Healthy habits

Build a steady drinking habit through the day.

Notes

  • This is a general guide; individual needs vary widely.
  • It does not count water from food and other drinks.
  • People with kidney or heart conditions should follow medical guidance.
  • Everything runs on your device; nothing is uploaded.

Not medical advice

This calculator gives a general estimate for information only and is not medical advice. Your actual needs depend on health, medication and activity. Consult a healthcare professional for guidance.

FAQ

How much water should I drink a day?
A common guide is about 33 ml per kg of body weight, adjusted for exercise and climate. This tool estimates that for you, but needs vary.
Does exercise change it?
Yes. You lose fluid through sweat, so the estimate adds roughly 350 ml for each 30 minutes of activity.
Does food count toward water?
Food and other drinks do contribute fluid, but this calculator estimates plain water intake only.
Can you drink too much water?
Yes, in rare cases excessive intake is harmful. Use the estimate as a guide and listen to your body.
Is my data sent to a server?
No. The calculation happens entirely in your browser.

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