Water Intake Calculator
Estimate how much fluid you need each day.
Calculate water intake
Your result
About hydration
Why hydration matters
Water supports digestion, circulation, temperature regulation, joint lubrication and nutrient transport.How this is calculated
Your baseline is derived from body weight, then adjusted for how active you are and the climate you spend your day in. Results are capped at four litres per day.Where fluid comes from
Not all of it needs to be plain water. Above 2,800 ml a day, your result includes a suggested split between water, other drinks and fluid from food.Fluid needs change with illness, medication and kidney health. Seek advice if you have a medical condition.