Water Intake Calculator
Water Intake Calculator
How Much Water Should I Drink?
Get your exact daily water intake based on your weight, activity level, and climate. Includes hourly schedule and hydration tips.
✅ WHO Based Formula
✅ Hourly Schedule
✅ 100% Free
Your Details
Your Daily Water Target
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Cups (250ml)
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Fluid Ounces
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500ml Bottles
Daily Water Cups Visual
Each 💧 = 250ml (1 cup)
Hourly Drinking Schedule
💧 Urine Color Hydration Guide
Clear (over-hydrated)Pale Yellow (ideal)Dark (dehydrated)
🎯 Aim for pale yellow urine (levels 1-3) — this is the best real-time hydration indicator
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How Much Water Should I Drink Per Day?
The National Academies of Sciences recommends 3.7 liters (125 oz) per day for men and 2.7 liters (91 oz) for women from all beverages and food. A simple formula is 35ml per kg of body weight per day, adjusted for activity level and climate.
The commonly cited "8 glasses a day" rule is a rough guideline, not a scientific standard. Your actual needs depend on your weight, how active you are, the temperature of your environment, and whether you are pregnant or breastfeeding.
How is Daily Water Need Calculated?
This calculator uses the 35ml per kg body weight formula as a baseline, then multiplies by your activity factor (1.0-1.8) and climate factor (1.0-1.3). Extra water is added for pregnancy (+300ml) and breastfeeding (+700ml) based on WHO guidelines.
For example, a 70kg moderately active person in moderate climate would need: 70 × 35ml × 1.4 × 1.1 = approximately 3.77 liters per day.
Signs of Dehydration
- Dark yellow or amber urine — Most reliable early indicator
- Thirst — You are already mildly dehydrated when you feel thirsty
- Fatigue and low energy — Even 1-2% dehydration reduces physical performance by up to 10%
- Headache — One of the most common dehydration symptoms
- Dry mouth and lips — Reduced saliva production
- Difficulty concentrating — Brain function declines with mild dehydration
- Dizziness — Occurs with moderate to severe dehydration
Tips to Drink More Water Daily
- Start your day with water — Drink 500ml immediately after waking up
- Carry a reusable water bottle — People who carry bottles drink 25% more water
- Set hourly reminders — Use this calculator's schedule as a guide
- Drink before every meal — 500ml before meals also reduces calorie intake
- Flavor your water — Add lemon, cucumber, or mint if plain water is boring
- Eat water-rich foods — Cucumber (96% water), watermelon (92%), strawberries (91%)
- Track your intake — Use a marked water bottle or a hydration app
Frequently Asked Questions
The National Academies of Sciences recommends about 3.7 liters (125 oz) per day for men and 2.7 liters (91 oz) for women from all beverages and food. A simple formula is 35ml per kg of body weight per day, adjusted for activity and climate.
No. The 8x8 rule is a general guideline but does not account for individual differences in body weight, activity level, climate, or health conditions. Heavier people, athletes, and those in hot climates need significantly more water.
Early signs include dark yellow urine, thirst, dry mouth, fatigue, and headache. Moderate dehydration causes decreased urine output, dizziness, and reduced performance. Check your urine color — pale yellow is ideal.
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