Water Intake Calculator
Calculate recommended daily water intake from weight and activity.
Activity
Suggested daily water
2.8 L
About 2,810 ml
Litres
2.8
Millilitres
2,810
US fl oz
95
Based on ~33 ml per kg plus an activity bump. Climate, pregnancy, and health conditions can change needs — not medical advice.
In-depth explanation
Estimate daily water intake from body weight (~33 ml/kg) with an extra allowance for higher activity levels. Everything runs locally in your browser — your inputs are not uploaded to produce the result.
About 33 ml per kilogram of body weight, plus an activity bump for more active lifestyles. Many people count all fluids toward hydration. This tool focuses on a total water-equivalent target.
Hot weather, illness, pregnancy, breastfeeding, and long workouts often increase needs — ask a clinician if unsure. Use Water Intake Calculator for quick planning; confirm important money, tax, or health decisions with an official source or professional when needed.
About 33 ml per kg is a simple heuristic, plus extra for higher activity. Climate, illness, pregnancy, and long endurance sessions change needs a lot. Urine colour and thirst are still useful signals.
Coffee and food contribute fluid for many people. This target is a water-equivalent, not a medical order. Ask a clinician if you have kidney, heart, or endocrine conditions.
Frequently asked questions
How is the amount calculated?
About 33 ml per kilogram of body weight, plus an activity bump for more active lifestyles.
Does coffee or tea count?
Many people count all fluids toward hydration. This tool focuses on a total water-equivalent target.
When should I drink more?
Hot weather, illness, pregnancy, breastfeeding, and long workouts often increase needs — ask a clinician if unsure.
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