Water Intake Calculator
Estimate how much water to drink each day.
How to use the Water Intake Calculator
Based on body weight with adjustments for exercise and climate.
Formula
Litres ≈ 0.033 × kg + 0.35 per 30 min exercise
Worked example
A 70 kg person exercising 30 minutes needs about 2.7 L.
Frequently asked questions
Does coffee count?
Yes, most beverages and water-rich foods contribute to daily fluid intake.
Results are estimates for educational and planning purposes. Always confirm important financial, health or legal decisions with a qualified professional. Last reviewed 2026-09-27.