Daily Hydration Calculator
How much water
should I drink today?
Enter your weight, activity level, and the weather to get a recommended daily water intake.
🔒 Your inputs never leave your browser — nothing is sent to a server
Water Intake Ledger
Results update instantly as you type
Recommended Daily Intake
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In 500ml Bottles
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How is this calculated?
We use roughly 33ml per kg of body weight as a baseline, then add more for higher activity levels and hot weather. This includes water from food and other beverages, not just plain water.
A note of caution
If you have kidney issues or another condition requiring fluid restriction, don't follow this recommendation — talk to your doctor instead.
Frequently Asked Questions
How accurate is this result?
This is a general reference estimate, not personalized medical advice.
Is my data stored or sent anywhere?
No. All calculations happen entirely in your browser.
Does this work on mobile?
Yes, the layout automatically adapts to your screen size.