Skip to content

Water Intake Calculator

Daily water needs by weight and activity.

Daily water intake

Daily water
105 oz
3,119 ml · 13.2 cups
Bottles (16.9 oz)
6.2
= 3.12 L
Per waking hour
6.6 oz
Spread evenly over a 16-hr awake day
What's next

Lock this in, share it, or take it further.

CompareSide-by-side scenariosRead the guidePlain-English deep-dive
Water Intake Calculator · Generated 5/2/2026 · calccenter.online/calculators/health/water-intake

Related fitness & health calculators

BMI Calculator
Body Mass Index and healthy weight range.
Calorie Calculator
Daily calorie needs for goals.
Body Fat Calculator
Body fat percentage (U.S. Navy method).
BMR Calculator
Basal metabolic rate at rest.
Macro Calculator
Protein / carb / fat split for your calories.
Ideal Weight Calculator
Several clinical formulas.

About the Water Intake Calculator

MethodologyHome

Daily water needs by weight and activity. Use this free water intake calculator to get instant results. All calculations run in your browser — nothing is sent to a server.

Frequently asked questions

What does this Water Intake Calculator do?

Daily water needs by weight and activity.

Is it free?

Yes — every calculator on Calc Center is free, with no sign-up or account required.

Does it work offline?

The site is a Progressive Web App — after your first visit, most pages work without an internet connection.