WaterIntakeCalculator
1036 calculators

Human Calculators

Daily water intake calculators for adults — men, women, elderly, weight-based, and weather-based.

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Top picks

Most popular in Human Calculators

#1 pick

Adult Daily Water Intake

Personalized daily water target for healthy adults, adjusted for weight, activity, and climate.

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#2 pick

Elderly Water Intake (65+)

Daily hydration target for older adults, with a safe minimum floor and climate adjustments.

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#3 pick

Water Intake for Weight Loss

Higher-end daily target with pre-meal water boost that supports satiety and weight loss.

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Water Intake on Losartan

Daily fluid target when taking losartan — side-effect adjusted.

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Water Intake on Amlodipine

Daily fluid target when taking amlodipine — side-effect adjusted.

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Water Intake on Hctz

Daily fluid target when taking hctz — side-effect adjusted.

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Water Intake on Furosemide

Daily fluid target when taking furosemide — side-effect adjusted.

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Water Intake on Warfarin

Daily fluid target when taking warfarin — side-effect adjusted.

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Water Intake on Statin

Daily fluid target when taking statin — side-effect adjusted.

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Water Intake on Prednisone

Daily fluid target when taking prednisone — side-effect adjusted.

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Water Intake on Adderall

Daily fluid target when taking adderall — side-effect adjusted.

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Water Intake on Ritalin

Daily fluid target when taking ritalin — side-effect adjusted.

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Water Intake on Ssri

Daily fluid target when taking ssri — side-effect adjusted.

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Water Intake on Snri

Daily fluid target when taking snri — side-effect adjusted.

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Water Intake on Lithium

Daily fluid target when taking lithium — side-effect adjusted.

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How it works

Simple, accurate, personalized

STEP 1

Pick your calculator

Choose the one that matches your situation from the grid above.

STEP 2

Enter a few details

Weight, activity, climate, species — takes under 30 seconds.

STEP 3

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.

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