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 189 kg
Precise daily target for a 189 kg adult.
OpenWater Intake for 190 kg
Precise daily target for a 190 kg adult.
OpenWater Intake for 191 kg
Precise daily target for a 191 kg adult.
OpenWater Intake for 192 kg
Precise daily target for a 192 kg adult.
OpenWater Intake for 193 kg
Precise daily target for a 193 kg adult.
OpenWater Intake for 194 kg
Precise daily target for a 194 kg adult.
OpenWater Intake for 195 kg
Precise daily target for a 195 kg adult.
OpenWater Intake for 196 kg
Precise daily target for a 196 kg adult.
OpenWater Intake for 197 kg
Precise daily target for a 197 kg adult.
OpenWater Intake for 198 kg
Precise daily target for a 198 kg adult.
OpenWater Intake for 199 kg
Precise daily target for a 199 kg adult.
OpenWater Intake for 200 kg
Precise daily target for a 200 kg adult.
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.