Water Intake Calculator
Estimate daily hydration volume needs based on body weight. Fast, free, and fully client-side.
Calculator Inputs
Weight (lbs)
Daily Exercise (minutes)
Hydration Target (Ounces)—
Hydration Target (Liters)—
How the Water Intake Calculator Works
Estimates recommended daily fluid intake in liters and fluid ounces based on body weight, daily physical activity duration, and hydration requirements.
Formula
Daily Intake (L) = (Body Weight in kg × 0.033) + (Exercise Minutes × 0.007)
Provides baseline metabolic hydration needs plus sweat replacement for physical activity.
Calculation Example
A 70 kg individual who exercises for 30 minutes daily should drink approximately (70 × 0.033) + 0.21 = ~2.52 liters (85 fl oz) of water.
Frequently Asked Questions
Does coffee or tea count toward daily water intake?
Yes, moderate consumption of caffeinated drinks contributes positively to total daily fluid hydration.
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