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 142 cm
Daily hydration target for a 142 cm tall adult.
OpenWater Intake for Height 144 cm
Daily hydration target for a 144 cm tall adult.
OpenWater Intake for Height 145 cm
Daily hydration target for a 145 cm tall adult.
OpenWater Intake for Height 147 cm
Daily hydration target for a 147 cm tall adult.
OpenWater Intake for Height 148 cm
Daily hydration target for a 148 cm tall adult.
OpenWater Intake for Height 150 cm
Daily hydration target for a 150 cm tall adult.
OpenWater Intake for Height 151 cm
Daily hydration target for a 151 cm tall adult.
OpenWater Intake for Height 153 cm
Daily hydration target for a 153 cm tall adult.
OpenWater Intake for Height 154 cm
Daily hydration target for a 154 cm tall adult.
OpenWater Intake for Height 156 cm
Daily hydration target for a 156 cm tall adult.
OpenWater Intake for Height 157 cm
Daily hydration target for a 157 cm tall adult.
OpenWater Intake for Height 159 cm
Daily hydration target for a 159 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.