Water Intake Calculator

Calculate optimal daily water consumption

Calculate Your Water Needs

Hydration Guidelines

Base Formula

35ml per kg of body weight

Starting point for daily hydration

Activity Adjustments

+10-50% based on exercise intensity

More active = more water needed

Climate Factors

+200-1000ml for hot weather

Hot, humid conditions require most

Special Conditions

Pregnancy: +300ml, Breastfeeding: +700ml

Illness may require adjustments

Hydration Signs

Well Hydrated: Pale yellow urine
Mildly Dehydrated: Dark yellow urine
Dehydrated: Very dark urine, thirst

Quick Tips

  • • Carry a reusable water bottle
  • • Drink water with each meal
  • • Set hourly hydration reminders
  • • Monitor urine color regularly
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How this is calculated

A rule of thumb of 35 ml per kg of body weight, adjusted for activity, climate, age, pregnancy and illness. For comparison, the National Academies' adequate intake from all drinks and food is about 3.7 liters a day for men and 2.7 for women.

Sources

Estimates for planning, not professional advice. What changed and when →

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