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How much water to drink a day

A daily water goal based on your weight.

How to use

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Your water goal.

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How much water to drink a day: what it is for

The calculator shows how much water to drink a day based on your weight (about 35 ml per kilo) and your activity level.

The result is shown in liters and in 250 ml (about 8 oz) glasses.

How to use

  1. Enter your weight.
  2. Choose your activity level.
  3. See how many liters and glasses to drink.

When to use it

  • Building a water-drinking habit.
  • Workout days and hot weather.
  • Keeping track of hydration.

Frequently asked questions

Is it really free?

Yes, 100% free. No sign-up, no subscription and no usage limits. All Tools123 tools are free and run right in your browser.

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