Water Intake Calculator

Estimate daily water needs from body weight, activity, climate, and lifestyle factors.

Daily water target

3.8 L

3,790 ml

Base need

2,450 ml

35 ml per kg

Exercise add-on

540 ml

12 ml per exercise minute

Climate add-on

500 ml

Editable assumption

Hydration inputs

Estimate daily water needs from weight, activity, climate, and caffeine.

Related calculators

Hydration estimate

Water needs vary with climate, food, sweat rate, health conditions, and medication. Treat this as a planning estimate, not medical advice.