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Water Intake Calculator for Weight Loss
Find how much water to drink while losing weight — using your body weight, activity and climate rather than a one-size-fits-all number. There is no special "weight-loss" water requirement: the same method applies. Start from about 33 mL of water per kilogram of body weight, add around 12 mL for each minute of exercise (useful when a diet includes more training), and add about 15% in hot, humid conditions. A 70 kg person training 45 minutes on a temperate day lands near 2.85 L, or roughly 96 fl oz of beverage water. Staying well hydrated helps you feel and perform better while dieting, and a glass of water before meals can modestly support appetite control — but water is not a fat-burner. Enter your weight in kilograms or pounds, your exercise minutes and your climate to get your target in mL, litres and fluid ounces, split into base, activity and climate. This is beverage water; NASEM totals (~3.7 L men / 2.7 L women) also include the ~20% from food. General hydration guidance, not medical advice — drink to thirst and aim for pale-straw urine rather than forcing an exact figure.
Same bodyweight method — no special weight-loss quota
- 70 kg + 45 min exercise, temperate → ≈ 2.85 L (~96 fl oz)
- Water supports dieting but is not a fat-burner
Frequently asked questions
How much water should I drink to lose weight?
Use the same target as anyone else: about 33 mL per kilogram of body weight, plus roughly 12 mL per exercise minute and about 15% more in hot weather. There is no separate weight-loss water requirement. A glass of water before meals may modestly help appetite control, but water itself does not burn fat.
Does drinking more water help you lose weight?
Only indirectly. Staying hydrated helps you feel and train better, and drinking water instead of sugary drinks cuts calories. Some studies suggest water before meals slightly reduces intake. But water is not a fat-burner — it supports a calorie deficit rather than creating one.