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 — Jain Diet Diet
Daily fluid target on the jain diet diet.
OpenWater Intake — Sattvic Diet Diet
Daily fluid target on the sattvic diet diet.
OpenWater Intake — Ayurveda Vata Diet
Daily fluid target on the ayurveda vata diet.
OpenWater Intake — Ayurveda Pitta Diet
Daily fluid target on the ayurveda pitta diet.
OpenWater Intake — Ayurveda Kapha Diet
Daily fluid target on the ayurveda kapha diet.
OpenWater Intake — Raw Till 4 Diet
Daily fluid target on the raw till 4 diet.
OpenWater Intake — 80 10 10 Diet
Daily fluid target on the 80 10 10 diet.
OpenWater Intake — High Protein Diet
Daily fluid target on the high protein diet.
OpenWater Intake — Low Protein Diet
Daily fluid target on the low protein diet.
OpenWater Intake — High Fat Diet
Daily fluid target on the high fat diet.
OpenWater Intake — Low Fat Diet
Daily fluid target on the low fat diet.
OpenWater Intake — Low Sodium Diet
Daily fluid target on the low sodium diet.
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.