Water Intake Calculator

Calculate your recommended daily water intake based on weight, activity level, and climate.

What is the Water Intake Calculator?

Calculates how much water you should drink each day based on your weight, activity level, and climate.

Get personalized recommendations in multiple units (milliliters, ounces, cups, bottles).

How to Calculate Your Water Intake

Follow these steps:

  • Choose your preferred unit system.
  • Enter your weight.
  • Select your activity level.
  • Select your climate.
  • Click Calculate to see your daily water needs.

Tips

  • Drink water gradually throughout the day rather than all at once.
  • Increase your intake when exercising or in hot weather.
  • Monitor your urine color as a hydration indicator.

Frequently Asked Questions

How much water should I drink per day?+
A general guideline is about 35 ml per kilogram of body weight (roughly half your weight in ounces). Active people and those in hot climates need more. The '8 glasses of water a day' rule is a rough estimate.
Does coffee count toward my water intake?+
Mostly yes. Although caffeine is a mild diuretic, the water in coffee and tea still contributes to hydration. However, plain water remains the best source.
How do I know if I'm well hydrated?+
Check your urine color — pale yellow indicates good hydration. Dark yellow means you need to drink more water. Other signs of dehydration: thirst, dry mouth, headache, and fatigue.

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Water Intake Calculator — free online water intake calculator, daily water intake, hydration calculator, how much water to drink, water needs. No signup required. Works in your browser.