Health & FitnessFree
Water Intake Calculator
Find out how much water you should drink daily based on your weight and activity.
How it works
Enter your body weight (in kg or lbs) and activity level (sedentary, moderate, active). The water intake calculator uses the standard formula (30-35 ml per kg of body weight) to recommend your ideal daily water intake in litres and glasses.
Why use this tool?
Staying properly hydrated improves energy, skin health, digestion, and cognitive performance. Most people underestimate how much water they need — this free hydration calculator gives a science-backed daily target.