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
Water Intake for Height 160 cm
Daily hydration target for a 160 cm tall adult.
OpenWater Intake for Height 162 cm
Daily hydration target for a 162 cm tall adult.
OpenWater Intake for Height 163 cm
Daily hydration target for a 163 cm tall adult.
OpenWater Intake for Height 165 cm
Daily hydration target for a 165 cm tall adult.
OpenWater Intake for Height 166 cm
Daily hydration target for a 166 cm tall adult.
OpenWater Intake for Height 168 cm
Daily hydration target for a 168 cm tall adult.
OpenWater Intake for Height 169 cm
Daily hydration target for a 169 cm tall adult.
OpenWater Intake for Height 171 cm
Daily hydration target for a 171 cm tall adult.
OpenWater Intake for Height 172 cm
Daily hydration target for a 172 cm tall adult.
OpenWater Intake for Height 174 cm
Daily hydration target for a 174 cm tall adult.
OpenWater Intake for Height 175 cm
Daily hydration target for a 175 cm tall adult.
OpenWater Intake for Height 177 cm
Daily hydration target for a 177 cm tall adult.
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Weight, activity, climate, species — takes under 30 seconds.
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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.