HEALTH & EVERYDAY
Water intake calculator
Estimate daily fluid from body weight and an adjustable factor.
Estimated result
2.3 litres/day
- Millilitres
- 2250 ml
Needs vary with weather, activity, pregnancy, illness and diet.
SOURCES & REVIEW
Checked against official guidance
Last checked 14 July 2026 · Rule version GB-2026.27.1
NHS: Healthy weight ↗COMMON QUESTIONS
Frequently asked questions
Is this an exact quote or tax return?
No. It is an estimate based on the inputs and assumptions shown.
When was this checked?
The method and linked official guidance were reviewed for the current UK release.