Health & Fitness
Water Intake Calculator - Daily Hydration
Estimate daily water intake based on weight and activity level.
Formulas and edge cases are reviewed against authoritative references before publication. For methodology, editorial standards, or corrections, use the links below.
Frequently asked questions
How is water intake estimated?
This calculator uses a simple weight-based formula plus activity time.
Does this include drinks like coffee?
You can include any fluids, but plain water is best for hydration.
Is this a medical recommendation?
No. It is a general estimate and not medical advice.
Related tools
About this tool
This Water Intake Calculator turns your inputs into practical results. Provide Weight and Daily activity to calculate Water intake and Equivalent.
Adjust values to compare scenarios and see how sensitive the result is. The calculation uses the numbers as entered, so double-check units and expect small differences from rounding in the displayed totals.