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Free toolWater Intake Calculator
Work out how much water to drink each day.
Suggested daily water
–
–Millilitres
–Cups (240ml)
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A general guide only. Needs rise in hot weather, illness, pregnancy and breastfeeding. Thirst and urine colour are useful signals too.
How much water do you need?
A common guideline is around 30–35 ml of water per kilogram of body weight, plus extra to replace what you lose during exercise (about 350 ml per 30 minutes).
Food counts too — crispy air-fried vegetables, fruit and soups all contribute to your daily fluids.