WaterDailyGoal

Open evidence registry

Hydration evidence explorer

Inspect the claim, intended scope, calculator use, safety boundary, and named original sources behind the site.

Quick answer

WaterDailyGoal separates population reference values, peer-reviewed measurement guidance, safety boundaries, and transparent site formula choices. Each record shows what a claim supports and where it should not be stretched into diagnosis or treatment.

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19 source-backed recordsDataset version 2026-09-30Formula WDG-2026.09Latest dataset update 2026-09-30

Why water calculators give different answers

Compare what the number includes before comparing its size. More inputs or a larger result do not establish greater personal accuracy.

Why water calculators give different answers
ApproachInputsWhat it describesLimitations
NAM / EFSA population referencePopulation group and life stageTotal water from food and drinksPopulation adequate intake, not a personal daily beverage minimum.
WaterDailyGoal weight-based planWeight, selected activity and climateBeverages; food-water context is separate33 ml/kg and the adjustments are site assumptions, not measured need.
Energy-based estimate (TDEE)Estimated energy expenditure from age, body size and activityA water estimate linked to energy; food/beverage split depends on the toolGIGA describes this approach. Estimating energy does not itself validate a personal water prescription.

Reproduce our example

70 kg · moderate activity (+300 ml) · temperate climate (×1.0)

(70 × 33 + 300) × 1.0 = 2610 ml → 2.6 L

The headline rounds to 0.1 L. The two base scenarios use 30 and 40 ml/kg with the same adjustments. They are scenarios, not a measured healthy interval.

Food water is not subtracted again from our beverage headline. Clinical restrictions and clinician instructions override every estimate. No method here identifies a medically safe maximum.

Source and method descriptions: NAM · EFSA · GIGA (TDEE)

Showing 19 of 19 evidence records

formulareference-intakemethod-comparison

Comparing water estimates

Site assumption — not a clinical recommendation · Editorial check 2026-09-30

Population total-water references, the site's beverage planning assumptions and energy-based estimates describe different quantities. More inputs or a larger result do not establish greater personal accuracy.

Scope
Adult planning context. GIGA's page is evidence of its stated method, not clinical validation.
Used by
Explains why results differ without adding an energy-based dose or changing the site formula.
Safety note
Compare food versus beverage scope first. Clinical restrictions override tools; no approach establishes a medically safe maximum.

Applied on: methodology · hydration-evidence

Named sources

formulapublic-healthreference-intake

Adult reference intakes

Source summary · Editorial check 2026-09-05

NAM and EFSA adequate-intake values describe total water from drinks plus food, not a prescription for every individual day.

Scope
Healthy adults in temperate conditions; sex-specific reference values are population-level anchors.
Used by
Provides separate population context; it does not validate the site formula or set a mandatory drinking minimum.

Applied on: methodology · water-intake-calculator

Named sources

formulacalculator-baseline

Weight-scaled baseline

Site assumption — not a clinical recommendation · Editorial check 2026-09-05

The site uses 33 ml/kg for the beverage midpoint, 30–40 ml/kg for alternative scenarios, additive activity settings and climate multipliers. These numeric choices are not a validated personal prescription.

Scope
General wellness estimate for adults; the 33 ml/kg value is a site formula choice, not a diagnostic rule.
Used by
Transparent planning assumptions; the cited population references do not validate the coefficients.
Safety note
Medical fluid restrictions, kidney/heart/liver disease, and clinician instructions override the calculator.

Applied on: water-intake-calculator-by-weight · daily-water-intake-chart-by-weight

Named sources

formulafood-waterdrink-target

Food water accounting

Site assumption — not a clinical recommendation · Editorial check 2026-09-05

The calculator separates drinking water from total water because food and other beverages can contribute meaningfully to total intake.

Scope
Everyday mixed diets; food-water share varies by diet, climate, appetite, and illness.
Used by
Keeps the headline result actionable as a drinking target while methodology explains total-water context.

Applied on: methodology · what-drinks-count

Named sources

heatactivitysafety

Heat and activity

Site assumption — not a clinical recommendation · Editorial check 2026-09-05

Water needs rise with heat, humidity, physical activity, sweat, clothing, and illness, so flat glass-count advice is weak.

Scope
General wellness planning; heat illness symptoms require cooling and escalation, not only more drinking.
Used by
Explains why context matters, without attributing the site’s 0/0.3/0.6/1.0 L or 0.95/1.0/1.10 coefficients to these sources. Situational tools plan user-selected volumes.
Safety note
Confusion, fainting, seizures or worsening heat symptoms need cooling and urgent escalation, whether or not the person is still sweating.

Applied on: water-intake-calculator · heat-hydration-calculator

Named sources

sportssweat-rateheat

Sweat-rate measurement

Source summary · Editorial check 2026-09-05

Sweat rate varies widely, so pre/post body-weight checks are a practical way to individualize training and heat plans.

Scope
Exercise, sport, and hot-shift planning; repeat measurements are better than one-off guesses.
Used by
Supports the sweat-rate calculator, marathon page, electrolyte calculator, and heat-shift planner.

Applied on: sweat-rate-calculator

Named sources

electrolytessportsheat

Electrolyte context

Source summary · Editorial check 2026-09-05

Prolonged or heavy sweat loss can make electrolyte replacement relevant; meals, actual losses and clinical restrictions determine the context.

Scope
Sports and heat-work planning; sodium/potassium restrictions and blood-pressure concerns need clinician guidance.
Used by
Drives electrolyte decision-tree cues and sodium-loss wording without making electrolyte products a default.
Safety note
Electrolyte drinks should not be used to justify forced over-drinking.

Applied on: electrolyte-decision-tree · electrolyte-sodium-calculator

Named sources

life-stagepregnancybreastfeedingsafety

Pregnancy and breastfeeding

Source summary · Editorial check 2026-09-05

Pregnancy and breastfeeding can raise fluid needs, but individual medical guidance comes first.

Scope
General pregnancy and lactation wellness pages; not a replacement for prenatal or postpartum care.
Used by
Shows clinician-first context and total-water references. No automatic pregnancy or breastfeeding drinking floor or electrolyte recommendation.
Safety note
Symptoms, high-risk pregnancy, vomiting, swelling, or medical restrictions should be handled with a clinician.

Applied on: water-intake-calculator-pregnancy · water-intake-while-breastfeeding-calculator

Named sources

medication-adjacentglp-1safety

GLP-1 medication support

Source summary · Editorial check 2026-09-05

GLP-1 medication labels and patient information warn that nausea, vomiting, diarrhea, and low appetite can raise dehydration concerns.

Scope
Medication-adjacent wellness support; the site does not advise dose changes or treatment decisions.
Used by
Triggers clinical warnings. Does not add litres, set a 2.7 L floor, or recommend daily salt.
Safety note
Persistent vomiting, diarrhea, kidney symptoms, or inability to drink should be discussed with a healthcare provider.

Applied on: glp-1-water-intake-calculator

Named sources

drink-countingcaffeinebeverage-hydration-index

What counts as water

Source summary · Editorial check 2026-09-05

Moderate coffee, tea, milk, and many water-rich drinks can contribute to fluid intake, while caffeine, sugar, and stimulants still matter.

Scope
General drink-counting guidance for healthy adults; sensitive groups should follow product and clinician guidance.
Used by
Counts actual beverage volume. The short-term BHI experiment is described with its population and endpoint; it is not used to generate effective millilitres.

Applied on: drink-hydration-index-calculator · what-drinks-count

Named sources

older-adultshabit-loopsafety

Older-adult hydration routines

Source summary · Editorial check 2026-09-05

Older adults may need more deliberate hydration prompts because heat and illness raise risk faster, and fluid needs shift with age, health, activity, and weather.

Scope
General wellness routines for older adults; clinician-set fluid limits override any habit target.
Used by
Supports the older-adult calculator, age guide, heat-wave checklist, and caregiver-friendly pacing copy.
Safety note
Heart, kidney, liver, sodium, and fluid-restriction instructions should be set by a clinician.

Applied on: water-intake-for-elderly-calculator

Named sources

drink-countingcaffeinesafety

Caffeine and stimulant boundaries

Source summary · Editorial check 2026-09-05

Caffeinated drinks can count toward fluid intake in moderation, but caffeine dose, sugar, stimulants, sleep, and blood-pressure sensitivity still matter.

Scope
Healthy-adult drink counting; children, pregnancy, heart rhythm concerns, anxiety, and medication contexts need extra caution.
Used by
Supports coffee, tea, soda, energy-drink, and drink-index verdicts without presenting all drinks as equivalent to water.

Applied on: what-drinks-count/does-coffee-count-as-water

Named sources

safetysportselectrolytes

Overdrinking and pacing

Source summary · Editorial check 2026-09-05

Forcing large volumes of plain water, especially during long endurance or hot-work contexts, can be unsafe; pacing and sodium context matter.

Scope
General wellness and sport planning; symptoms of hyponatremia, heat illness, or worsening confusion require urgent escalation.
Used by
Supports high-goal warnings, hourly pacing copy, marathon guidance, electrolyte decision prompts, and the 'too much water' safety guide.
Safety note
The site’s 1 L/hour caution is not a universal safe ceiling. A clinician or measured sport-specific plan may require a different limit.

Applied on: how-much-water-is-too-much · blog/how-much-water-to-drink-while-exercising

Named sources

workplaceheatsafety

Workplace heat planning

Source summary · Editorial check 2026-09-05

Hydration plans for heat work should be paired with shade, cooling, breaks, workload changes, and escalation steps instead of relying on water alone.

Scope
Construction, warehouse, delivery, school, coaching, and outdoor-work guidance; it does not replace an employer heat-safety policy.
Used by
Supports the heat-shift planner, workplace toolkit, supervisor printables, and heat-wave checklist.
Safety note
Heat illness symptoms should trigger cooling and workplace or emergency procedures, not only extra fluids.

Applied on: hydration-guide/workplace-heat-hydration-toolkit · heat-shift-hydration-planner

Named sources

heatworkplaceurgent-caresafety

Heat illness escalation

Source summary · Editorial check 2026-09-05

Heat illness warning signs can overlap with dehydration, but confusion, fainting, severe weakness, seizures, or worsening symptoms require cooling and urgent escalation.

Scope
Heat-wave, outdoor-work, warehouse, delivery, coach, teacher, sauna, and exercise-in-heat guidance; not a diagnostic checklist.
Used by
Keeps heat tools and guides from framing every symptom as a drink-more-water problem.
Safety note
Escalation and cooling come before hydration math when symptoms are severe or worsening.

Applied on: heat-hydration-calculator · sauna-hydration-calculator

Named sources

kidney-stonesurinesafetymedical-adjacent

Kidney-stone hydration context

Source summary · Editorial check 2026-09-05

Fluid intake is commonly part of kidney-stone prevention guidance, but stone type, diet, medications, and clinician instructions change the right plan.

Scope
General educational context for kidney-stone and dark-urine pages; not diagnosis, treatment, or a substitute for stone-specific care.
Used by
Supports cautious kidney-stone and dark-urine copy without turning the water calculator into a treatment plan.
Safety note
Pain, fever, vomiting, blood in urine, or known kidney disease should be handled with medical care.

Applied on: hydration-guide/hydration-for-kidney-stones

Named sources

utiurinesafetymedical-adjacent

UTI and urinary symptom boundaries

Source summary · Editorial check 2026-09-05

Hydration can support urinary health, but UTI-like symptoms require medical judgment and should not be treated as a hydration-only issue.

Scope
General wellness guidance for UTI, urine-color, and dark-urine pages; not antibiotic advice or self-diagnosis.
Used by
Supports clinician-first warnings on urinary symptom pages and helps avoid overpromising water as a cure.
Safety note
Fever, chills, side or back pain, nausea, vomiting, blood in urine, pregnancy, or recurrent symptoms need prompt care.

Applied on: hydration-guide/hydration-for-uti · hydration-guide/dark-urine-hydration

Named sources

weight-lossresearch-limits

Water and weight loss

Source summary · Editorial check 2026-09-05

A small 12-week study in 48 adults aged 55–75 tested pre-meal water with a reduced-calorie diet. It does not justify adding 1.5 L to everyone’s beverage estimate. A later controlled thermogenesis study does not support a reliable metabolism-boost claim.

Scope
Specific study populations and outcomes; no guaranteed weight loss or universal dose.
Used by
The weight-loss page uses the standard calculator estimate. Meal water is included within it.

Applied on: water-intake-for-weight-loss-calculator

Named sources

travelhangoverheatsafety

Situational fluid planning

Site assumption — not a clinical recommendation · Editorial check 2026-09-05

Flight duration, hangover duration, sauna minutes and hours at altitude cannot establish an individual replacement dose. Water does not cure hangovers or altitude illness.

Scope
Container and timing planning with a user-selected volume, not prediction of losses or treatment.
Used by
No automatic hourly multiplier or electrolyte endorsement. The entered amount is divided into bottles and an average pace.

Applied on: flight-hydration-calculator · hangover-hydration-calculator · sauna-hydration-calculator · altitude-hydration-calculator · heat-hydration-calculator

Named sources

Maintained by the WaterDailyGoal TeamLast updated Editorial update; not a medical review.