Water Intake Calculator
Calculate your recommended daily water intake based on body weight and activity level.
—
Daily Water
—
In Liters
—
In Cups
—
Water Bottles (16.9 oz)
Recent Calculations
What Is Water Intake?
Adequate water intake is essential for metabolism, temperature regulation, joint lubrication, and cognitive function.
Formula
Water (oz) = Body Weight (lbs) × Activity FactorExample
A 170 lb moderately active person needs about 111 oz (3.3 L) of water per day.
Frequently Asked Questions
Is 8 glasses of water enough?
8 glasses (64 oz) is a general guideline. Actual needs depend on body size, activity, climate, and diet.
Does coffee count toward water intake?
Yes, moderate coffee and tea intake counts. Caffeine is a mild diuretic but the fluid content more than compensates.