Illustration of glasses and bottles of water and other liquids.

Water Intake

Daily fluid estimate

A simple guide: about 35 ml per kg body weight, plus extra for activity. Includes water and other fluids — adjust for climate, health, and thirst.

Whole stones and pounds (LB)
Daily fluid (ml)
Daily fluid (litres)
250 ml glasses (approx.)

ml ≈ (kg × 35) + activity bonus. Glasses assume 250 ml each. Hot weather, pregnancy, and illness may need more.

Not medical advice. Drink when thirsty and follow clinician guidance if you have fluid restrictions.