Water Intake Calculator for Weight Loss
Drinking 500ml of water 30 minutes before each meal has been shown in clinical trials to reduce meal calorie intake by about 13% and increase weight loss by 44% over 12 weeks compared to the control group. For a 70kg person aiming to lose weight, target 2.5-3 litres per day total.
Total per Day
2,950 ml
In Litres
2.95 L
Glasses (250ml)
12 glasses
Hourly Schedule
Spread 2.95L across 16 waking hours = 184ml/hour
About 1 glass every hour
| Component | ml/day |
|---|---|
| Base (35ml × 70kg) | 2450 |
| Activity add-on | +500 |
| Climate add-on | +0 |
| Total | 2950 |
Base recommendation: 35ml per kg of body weight. Additional needs for exercise and heat. Coffee and tea count but alcohol does not. Spread intake throughout the day — avoid drinking large amounts at once.
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Common questions about Water Intake Calculator for Weight Loss
How does water help with weight loss?
Water increases thermogenesis (calorie burning) by about 30% for 40-60 minutes after drinking 500ml. It fills stomach volume, reducing hunger. It replaces high-calorie drinks. And it is required for fat metabolism - every fat molecule needs water molecules to break down via lipolysis. Dehydration literally slows fat burning.
Should I drink cold or warm water?
Cold water (around 4 degrees C) burns about 8 extra calories per 500ml as your body warms it - negligible for weight loss. Warm water may slightly improve digestion and circulation. Temperature does not matter much for weight loss. Drink whatever temperature keeps you drinking enough total volume.
Can I drink too much water?
Yes. Hyponatremia (water intoxication) occurs when sodium is diluted below 135 mmol/L, usually from drinking more than 1 litre per hour over several hours. This is rare in normal life but has happened to marathon runners. For most people, 4-5 litres per day is the practical upper limit - above that, consult a doctor.