Water Intake Calculator
Calculate how much water you should drink daily based on your body weight, activity level, and climate. Proper hydration supports performance, recovery, and overall health.
How is this calculated?
Daily water intake is calculated using a base formula adjusted for activity level, climate, and caffeine consumption.
Base formula:
Base (oz) = body weight (lbs) × 0.5
Activity multiplier:
Sedentary: ×1.0 | Light: ×1.1 | Moderate: ×1.2 | Very Active: ×1.4 | Extreme: ×1.6
Climate adjustment:
Cool / Temperate: +0 oz | Warm: +16 oz | Hot / Humid: +32 oz
Caffeine adjustment:
+8 oz per caffeinated drink (up to 4 drinks counted). Caffeine is a mild diuretic, so extra water helps offset fluid loss.
Total (oz) = (base × activity) + climate + (caffeine × 8)
For metric users, kilograms are converted to pounds internally (1 kg = 2.205 lbs) and results are displayed in both ounces and milliliters (1 oz = 29.5735 ml).
These recommendations are general guidelines. Individual needs may vary based on health conditions, medications, and other factors. Consult a healthcare professional for personalised advice.