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 178 cm
Daily hydration target for a 178 cm tall adult.
OpenWater Intake for Height 180 cm
Daily hydration target for a 180 cm tall adult.
OpenWater Intake for Height 181 cm
Daily hydration target for a 181 cm tall adult.
OpenWater Intake for Height 183 cm
Daily hydration target for a 183 cm tall adult.
OpenWater Intake for Height 184 cm
Daily hydration target for a 184 cm tall adult.
OpenWater Intake for Height 186 cm
Daily hydration target for a 186 cm tall adult.
OpenWater Intake for Height 187 cm
Daily hydration target for a 187 cm tall adult.
OpenWater Intake for Height 189 cm
Daily hydration target for a 189 cm tall adult.
OpenWater Intake for Height 190 cm
Daily hydration target for a 190 cm tall adult.
OpenWater Intake for Height 192 cm
Daily hydration target for a 192 cm tall adult.
OpenWater Intake for Height 193 cm
Daily hydration target for a 193 cm tall adult.
OpenWater Intake for Height 195 cm
Daily hydration target for a 195 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.