Add the requested inputs
Use the labelled fields in the workspace above. If example values are provided, try them first or replace them with your own.
Health & wellbeing · Free online tool
Water intake calculator
Turn a general daily hydration target into manageable drinks and checkpoints.
3 guest runs per rolling 24 hours10 with a free accountPrivate inputsMobile-friendly
Water intake calculator workspace
Runs locally in your browser
This is a general planning estimate, not a medical recommendation. Follow individual clinical advice.
Result
Rough daily target—
Bottles—
250 ml cups—
Per waking hour—
Important context
Use it with confidence
How to use the water intake calculator.
Calculate and review
Use the main action when needed. A user-editable target is divided by container size and waking hours; no medical requirement is inferred.
Try a worked example
Divide the target by your usual glass or bottle size to see a practical number of servings.
Check the assumptions
Needs vary with health, medication, pregnancy, climate, exercise and food. Follow clinician advice where applicable.
Checked sources
Official guidance behind this tool.
Water, drinks and hydration
NHS guidance says 6 to 8 cups or glasses of fluid a day is a general guide and that needs can rise with pregnancy, heat, prolonged activity or illness. Clinical advice takes priority.
Reference checked 25 July 2026. The source takes priority if guidance changes.
Helpful answers
Water intake calculator FAQs.
Is the water intake calculator free?
Yes. Guests receive 3 runs per rolling 24 hours, verified free accounts receive 10, and Premium subscribers receive unlimited normal use.
Does UtilHub upload or save my inputs?
No. This tool runs in your browser and UtilHub does not receive or store the values you enter. Your browser or device may still retain normal local history or form data.
How does this water intake calculator work?
A user-editable target is divided by container size and waking hours; no medical requirement is inferred.
What should I check before using the result?
Needs vary with health, medication, pregnancy, climate, exercise and food. Follow clinician advice where applicable.