Hydration toolkit
Calculators, checks, and reference tools
Quick answer
Use the main water intake calculator for your daily goal, then jump to specialty tools for sweat rate, urine color, weight tables, drink counting, and unit conversions.
Toolkit map
27tool-first calculators
10live languages
0accounts required
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Find the right hydration tool
Water Intake CalculatorOpenThe full calculator with every option: units, activity, climate, life stage, and GLP-1.Hydration Plan GeneratorOpenTurn your daily water goal into a bottle plan, sip schedule, stop time, and calendar reminders.Water Bottle Refill CalculatorOpenTurn your daily water goal into full bottle fills, partial refills, remaining water, and a pacing schedule.Bottle TrackerOpenTrack a daily or 7-day bottle plan with local storage, URL state, print, and CSV export.By Body WeightOpenHow much water to drink based on your weight, in pounds or kilograms.Urine Color Hydration CheckOpenUse urine color as a quick hydration clue, with safety notes for dark, unusual, or persistent changes.Sweat Rate CalculatorOpenMeasure sweat rate and plan pre, during, post, heat, and sodium-loss cues.Electrolyte Sodium CalculatorOpenEstimate whether electrolytes are worth it today from sweat rate, duration, heat, and intensity.
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ToolWater Intake CalculatorThe full calculator with every option: units, activity, climate, life stage, and GLP-1.Open toolToolHydration Plan GeneratorTurn your daily water goal into a bottle plan, sip schedule, stop time, and calendar reminders.Open toolBottleWater Bottle Refill CalculatorTurn your daily water goal into full bottle fills, partial refills, remaining water, and a pacing schedule.Open toolBottleBottle TrackerTrack a daily or 7-day bottle plan with local storage, URL state, print, and CSV export.Open toolBody sizeBy Body WeightHow much water to drink based on your weight, in pounds or kilograms.Open toolSafetyUrine Color Hydration CheckUse urine color as a quick hydration clue, with safety notes for dark, unusual, or persistent changes.Open toolPerformanceSweat Rate CalculatorMeasure sweat rate and plan pre, during, post, heat, and sodium-loss cues.Open toolSafetyElectrolyte Sodium CalculatorEstimate whether electrolytes are worth it today from sweat rate, duration, heat, and intensity.Open toolSafetyElectrolyte Decision TreeDecide whether plain water, electrolytes, or a sports drink fits today's duration, heat, effort, sweat, and food.Open toolPerformanceAthlete Hydration CalculatorDaily hydration for athletes, with sweat-rate and electrolyte guidance.Open toolReferenceWater for Weight LossAn ordinary beverage plan and the limits of pre-meal water research. No automatic weight-loss supplement.Open toolConvertWater ConversionsGlasses, cups, ounces, bottles, gallons, and litres — converted and tied to your goal.Open tool
Specialty calculators
PersonaGLP-1 Water CalculatorMedication symptom context and an ordinary planning estimate. No universal GLP-1 water dose.Open toolToolKeto Water CalculatorLow-carb diet changes, beverage planning and electrolyte cautions.Open toolPerformanceBodybuilding Water CalculatorEveryday beverage planning, measured sweat losses and overdrinking cautions.Open toolPerformanceMarathon Hydration CalculatorBuild a marathon fluid plan from sweat rate, heat, pace, and sodium needs.Open toolPersonaPregnancy Water CalculatorPregnancy total-water references, practical access to drinks, and individual clinical guidance.Open toolPersonaBreastfeeding Water CalculatorLactation total-water context and drinking routines without an automatic beverage floor.Open toolPersonaWater for Older AdultsHydration guidance for older adults with thirst-signal and medication cautions.Open toolHeatHeat Hydration CalculatorHeat hydration calculator. Enter your own amount; this tool does not calculate a medical needOpen toolHeatHeat Shift Hydration PlannerBuild a printable hot-work shift card with water pace, bottle refills, breaks, and an electrolyte cue.Open toolToolTeam Hydration Supply CalculatorEstimate litres, gallons, bottles, cases, reserve, and break-by-break water staging for a team, crew, class, or event.Open toolHeatSauna Hydration CalculatorSauna hydration calculator. Enter your own amount; this tool does not calculate a medical needOpen toolToolAltitude Hydration CalculatorAltitude hydration calculator. Enter your own amount; this tool does not calculate a medical needOpen toolToolFlight Hydration CalculatorFlight hydration calculator. Enter your own amount; this tool does not calculate a medical needOpen toolToolHangover Hydration CalculatorHangover hydration calculator. Enter your own amount; this tool does not calculate a medical needOpen tool
Reference and guides
DownloadHydration DownloadsPrintable hydration charts, urine color chart, sweat-rate worksheet, and shareable stat cards.Open toolReferenceHydration Evidence ExplorerBrowse the source-backed claims, scope, safety notes, and formula uses behind WaterDailyGoal tools and guides.Open toolToolDrink Hydration IndexCompare water, milk, coffee, tea, ORS, soda, and beer with a simplified hydration-retention calculator.Open toolReferenceExact-Weight LookupBrowse exact-weight water goals from 100–300 lb and 40–130 kg.Open toolReferenceStatic Water ChartA full static table of daily water goals by weight in pounds and kilograms.Open toolGuideWhat Counts as Water?Does coffee, tea, milk, soda, juice, or beer count toward your water? Clear verdicts with the science.Open toolBody sizeWater Per Pound FormulaUS-unit formula guide for the 0.5–0.75 oz per pound rule.Open toolBody sizeWater Per kg FormulaMetric formula guide for the 30–40 ml per kg rule.Open toolBody sizeCalculate by WeightA step-by-step method for calculating daily water intake from weight.Open tool
Guides and situations
GuideHydration GuidesBrowse hydration guides for body size, heat work, fasting, hot yoga, winter, urine color, medications, and safety.Open toolGuideWater Intake by AgeHow age changes hydration habits, thirst cues, and safe daily water planning.Open toolReferenceWater Intake for MenA practical men's hydration guide using body weight, training, heat, and bottle planning.Open toolReferenceWater Intake for WomenA practical women's hydration guide for daily goals, pregnancy, breastfeeding, heat, and training.Open toolBody sizeWater by Height and WeightHow to use height and weight together without pretending height alone predicts hydration needs.Open toolHeatWorkplace Heat ToolkitSupervisor-ready heat hydration toolkit with shift cards, refill access, electrolyte cues, printables, and escalation prompts.Open toolGuideOutdoor Worker HydrationHydration guidance for outdoor workers, heat exposure, breaks, electrolytes, and pacing.Open toolGuideConstruction Worker HydrationA heat-aware hydration plan for construction work, PPE, breaks, electrolytes, and safe pacing.Open toolGuideWarehouse Worker HydrationHydration guidance for warehouses, loading docks, picking shifts, fans, heat pockets, and breaks.Open toolGuideDelivery Driver HydrationA practical hydration routine for delivery routes, hot vehicles, restroom planning, and long shifts.Open toolHeatCoach and Teacher Heat HydrationHydration planning for coaches, PE teachers, recess duty, field days, and youth sports in heat.Open toolGuideFasting and Ramadan HydrationA cautious hydration routine for fasting windows, Ramadan, suhoor, iftar, heat, caffeine, and sleep.Open toolGuideHot Yoga HydrationHydration before and after hot yoga, sweat loss, electrolytes, dizziness, and safe pacing.Open toolHeatHeat Wave Hydration ChecklistHeat-wave checklist for water access, pacing, cooling, electrolytes, and urgent symptom escalation.Open toolGuideWinter HydrationWhy hydration still matters in winter: dry air, indoor heating, skiing, altitude, and low thirst.Open toolGuideGallon a Day Water SafetyWhen a gallon of water a day makes sense, when it is too much, and how to pace it safely.Open toolGuideHydration and HeadachesA safe, non-diagnostic guide to hydration habits when headaches may overlap with low fluid intake.Open toolGuideHydration and MedicationsA cautious guide to hydration habits around medications, thirst changes, and fluid restrictions.Open toolSafetyHydration and Kidney StonesGeneral wellness hydration context for kidney-stone prevention discussions, without diagnosis or treatment claims.Open toolSafetyHydration and UTIA cautious wellness guide to hydration habits around possible urinary tract symptoms.Open toolSafetyDark Urine and HydrationWhat dark urine can and cannot tell you about hydration, with safety signs that need care.Open tool
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