Water Intake Calculator
Estimate daily hydration needs from body weight, exercise, and caffeine intake
Unit: kg
Unit: min
Unit: cups
Daily Water Target
3.31 L
500ml Bottles Needed
6.6
250ml Glasses Needed
13.3
How this calculator works
Hydration calculator for daily water intake planning based on weight and activity.
Daily Water = Base Need + Exercise Adjustment + Caffeine Offset
Quick tips
- •Hot weather, altitude, illness, and intense training can increase hydration needs.
- •Use this as a planning baseline and adjust according to thirst and urine color.
- •If advised by a doctor to limit fluids, follow medical guidance instead.
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Water Intake Calculator
This water intake calculator gives you a simple hydration target you can translate into bottles or glasses across the day.
Formula: Daily Water = Base Need + Exercise Adjustment + Caffeine Offset
- Hot weather, altitude, illness, and intense training can increase hydration needs.
- Use this as a planning baseline and adjust according to thirst and urine color.
- If advised by a doctor to limit fluids, follow medical guidance instead.
Frequently Asked Questions
Do coffee and tea count toward hydration?
They can contribute to fluid intake, but this calculator adds a small offset to encourage balanced hydration.
Is everyone supposed to drink the same amount of water?
No. Hydration needs vary with size, activity, weather, and health status.