Human Calculators
Daily water intake calculators for adults — men, women, elderly, weight-based, and weather-based.
Most popular in Human Calculators
Adult Daily Water Intake
Personalized daily water target for healthy adults, adjusted for weight, activity, and climate.
Open calculatorElderly Water Intake (65+)
Daily hydration target for older adults, with a safe minimum floor and climate adjustments.
Open calculatorWater Intake for Weight Loss
Higher-end daily target with pre-meal water boost that supports satiety and weight loss.
Open calculatorExplore the full library
Liver Disease Water Intake
Liver hydration plan.
OpenCirrhosis Water Intake
Cirrhosis fluid balance.
OpenCOPD Water Intake
COPD hydration plan.
OpenAsthma Water Intake
Airway hydration plan.
OpenStroke Recovery Water
Post-stroke hydration.
OpenDementia Care Water Plan
Dementia patient hydration.
OpenAlzheimer's Water Intake
Alzheimer's care hydration.
OpenParkinson's Water Intake
Parkinson's hydration plan.
OpenOsteoporosis Water Intake
Bone-support hydration.
OpenAnemia Water Intake
Anemia-support hydration.
OpenEpilepsy Water Intake
Seizure-safe hydration.
OpenVertigo Water Intake
Inner-ear hydration.
OpenSimple, accurate, personalized
Pick your calculator
Choose the one that matches your situation from the grid above.
Enter a few details
Weight, activity, climate, species — takes under 30 seconds.
Get your target
A research-backed daily target plus an hourly schedule.
Learn the science behind human calculators
Read our in-depth guides for research-backed context on every calculator here.