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 203 cm
Daily hydration target for a 203 cm tall adult.
OpenWater Intake for Height 4 ft 10 in
Daily hydration for a 4 ft 10 in adult.
OpenWater Intake for Height 4 ft 11 in
Daily hydration for a 4 ft 11 in adult.
OpenWater Intake for Height 5 ft 0 in
Daily hydration for a 5 ft 0 in adult.
OpenWater Intake for Height 5 ft 1 in
Daily hydration for a 5 ft 1 in adult.
OpenWater Intake for Height 5 ft 2 in
Daily hydration for a 5 ft 2 in adult.
OpenWater Intake for Height 5 ft 3 in
Daily hydration for a 5 ft 3 in adult.
OpenWater Intake for Height 5 ft 4 in
Daily hydration for a 5 ft 4 in adult.
OpenWater Intake for Height 5 ft 5 in
Daily hydration for a 5 ft 5 in adult.
OpenWater Intake for Height 5 ft 6 in
Daily hydration for a 5 ft 6 in adult.
OpenWater Intake for Height 5 ft 7 in
Daily hydration for a 5 ft 7 in adult.
OpenWater Intake for Height 5 ft 8 in
Daily hydration for a 5 ft 8 in adult.
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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.