DrinkWaterUSA links to source material so readers can distinguish source guidance from the site’s own tool calculations. A citation provides context for the specific statement beside it; it does not automatically validate a calculator formula.
Water intake and total water
- National Academies, Dietary Reference Intakes for Water: overview and summary — total water reference values and the distinction between an Adequate Intake and an individual requirement.
- National Academies, Dietary Reference Intakes for Water: life-stage tables — reference values by age and life stage.
- CDC, About Water and Healthier Drinks — water, beverages, food, and circumstances that may affect needs.
Exercise and sweat-rate measurement
- National Athletic Trainers’ Association, Fluid Replacement for the Physically Active — individualized fluid replacement, variation, and a sweat-rate equation.
Conversions
- NIST Guide to the SI, Appendix B.8 — selected conversion factors.
How to read a citation here
We link close to the claim the source supports. Some pages include both official guidance and a separate site heuristic. Those must not be confused: the sources above provide evidence and context, while the site explains its own arithmetic in the Methodology.
Sources can be revised by their publishers. If a link is broken or a quotation appears inconsistent with the source, please report it.