How to use Water Intake Calculator
Enter the required values, choose the relevant options, and read the instant result. Use Reset to restore the default example and Copy result when you need to save the output.
Free online calculator
Water Intake Calculator
Estimate daily water intake.
Health
Water Intake Calculator
Estimate daily water intake.
Web app
Water Intake Calculator
Runs locally. Works on mobile and desktop.
Result
Table of contents
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About this calculator
Estimate daily water intake. The calculation runs entirely in your browser, so the page stays fast and does not require uploads.
Good checks
Review units before comparing results, keep inputs positive when the formula requires it, and round only after the final answer when precision matters.