How Much Water Should You Drink Each Day

There is no single amount of water that is right for every person on every day. The familiar idea of eight glasses can be a useful reminder, but hydration needs change with the person, the weather and what the day involves.

What the UK guidance says

The NHS says that people should generally aim for 6 to 8 cups or glasses of fluid a day. It also makes clear that this is a guide rather than a precise target for everybody.

Water is a healthy and inexpensive choice, but it is not the only fluid that counts. Lower fat milk and sugar free drinks, including tea and coffee, can also contribute. Food supplies some fluid too.

Why individual needs vary

You may need more fluid when you are physically active for long periods, in a hot environment, pregnant, breastfeeding, ill or recovering from illness. Body size, diet and personal circumstances can also affect requirements.

This is why a fixed number should be treated as a starting point rather than a rule.

Practical signs to monitor

The NHS recommends drinking enough during the day for your urine to remain a clear, pale yellow colour. Thirst, dark yellow strong smelling urine, passing urine less often, dizziness, tiredness and a dry mouth can be signs of dehydration, although these symptoms can have other causes.

Persistent symptoms, symptoms during illness or signs of serious dehydration need appropriate medical advice. Babies, children and older adults can be at greater risk.

Does every drink need electrolytes

No. Plain water is an effective everyday hydration choice, and most people obtain electrolytes from a varied diet. Electrolyte products can offer a convenient option for people who enjoy them or want a measured product as part of their routine, but they do not replace water or a balanced diet.