Health & Fitness
Water Intake Calculator
Calculate your recommended daily water intake based on your body weight, activity level, and climate. Stay hydrated with a personalized goal.
Enter your details and click Calculate
Daily Water Intake
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Breakdown
How is this calculated?
Formula: Base water need adjusted by activity and climate.
Base = Weight(kg) × 0.033 L
Activity Multipliers:
Sedentary: ×1.0 | Light: ×1.2 | Moderate: ×1.4
Active: ×1.6 | Very Active: ×1.8
Climate Adjustment:
Hot: +0.5 L | Temperate: +0 L | Cold: -0.2 L
Daily Intake = (Base × Activity Multiplier) + Climate Adjustment
Glasses = Daily Intake / 0.25 L
Bottles = Daily Intake / 0.5 LCalculation history
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FAQ
Frequently asked questions
How is daily water intake calculated?
The base formula is weight (kg) × 0.033 litres. This gives a baseline, which is then adjusted by activity level (multiplier from 1.0× to 1.8×) and climate (+0.5L for hot climates, -0.2L for cold climates). The result is a personalized daily recommendation.
How much water should I drink per day?
The general guideline is about 2–3 litres (8–12 glasses) per day for adults. However, individual needs vary based on body weight, physical activity, climate, and health conditions. This calculator provides a personalized estimate based on your specific factors.
What are signs of dehydration?
Common signs include dark yellow urine, dry mouth, fatigue, headaches, dizziness, and reduced urine output. Mild dehydration can affect concentration and mood. Severe dehydration requires medical attention — symptoms include rapid heartbeat, sunken eyes, and confusion.
Can you drink too much water?
Yes. Over-hydration (hyponatremia) occurs when you drink so much water that blood sodium levels become dangerously low. This is rare but can happen during extreme exercise. Symptoms include nausea, headaches, and in severe cases, seizures. Aim for the recommended amount and listen to your body.
Does coffee or tea count towards water intake?
Yes, caffeinated beverages do contribute to hydration despite their mild diuretic effect. Studies show the hydrating effect outweighs the diuretic effect for moderate consumption. However, plain water remains the best choice for hydration as it has no calories or additives.