Free Hydration Calculator
Calculate your recommended daily water intake based on weight and activity level using the metric formula.
lbs
Daily Water (liters)
2.54 L
Daily Water (ounces)86 oz
Daily Water (cups)10.8 cups
Daily Water (liters) vs Body Weight
Weight-Based Hydration Formula
Base Water (liters) = Weight (kg) x 0.033
Adjusted Water = Base x Activity Multiplier
This formula is the standard metric approach. Active individuals need 20-60% more water than sedentary ones.
Example Calculation
A 170 lb moderately active person.
- 01Weight in kg = 170 x 0.4536 = 77.1 kg
- 02Base water = 77.1 x 0.033 = 2.54 liters
- 03Adjusted = 2.54 x 1.4 = 3.56 liters
- 04In ounces = 3.56 x 33.814 = 120 oz
Frequently Asked Questions
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