Formula changelog

WDG-2026.06 - Current baseline

The current model starts with body weight at about 33 ml/kg, adds an activity adjustment, applies a climate multiplier, and enforces floors for pregnancy, breastfeeding, and GLP-1 medication. It also displays food-fluid context, a sip schedule, overhydration safety, and an electrolyte verdict.

Sources and assumptions are documented on the methodology page. The formula remains a practical wellness estimate for generally healthy adults, not a prescription.

2026-06 trust update

Added visible formula versioning, a no-fake-reviewer editorial policy, WHO and NHS context, noindex handling for non-indexable utilities, and a dedicated share/API layer so result pages, OG cards, and JSON output all use the same calculation.

When this page changes

We update this changelog when calculation logic changes, source assumptions change, safety wording materially changes, or a new output channel such as the public API or share-card route begins using the formula.