A simple daily check-in
Daily Water Goal Calculator
Turn a general fluid guide into glasses and liters, then see what remains today. No guilt, no fake precision.
Set your guide
The NHS suggests 6–8 cups or glasses of fluid a day as a general guide.
What this calculator does—and does not do
It multiplies your selected number of glasses by your glass size, then subtracts what you have logged. It is a planning tool for generally healthy adults, not a diagnosis or a personalized medical prescription.
If a clinician has told you to limit fluids, or you have kidney, heart, liver, electrolyte, or other medical concerns, follow their advice. Drinking excessive water can also be harmful.
Hydration FAQ
Does everyone need exactly 8 glasses?
No. Six to eight glasses is a general guide. CDC guidance says needs vary with age, sex, pregnancy or breastfeeding, activity, weather, and health.
What counts toward fluid intake?
According to the NHS, water, lower-fat milk, and sugar-free drinks—including tea and coffee—can count. Food also provides some water.
How can I tell whether I am drinking enough?
The NHS suggests aiming for clear, pale-yellow urine as a practical general sign. Persistent thirst, very dark urine, dizziness, illness, or concerns about hydration deserve professional advice.
Sources
- CDC: About Water and Healthier Drinks — reviewed for this page July 2026.
- NHS: Water, drinks and hydration — 6–8 glass general guide and higher-need factors.