Osvian
Osvian
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Water Intake Calculator

Daily water target by body weight and activity level, with climate adjustment. US ounces or metric milliliters.

Your inputs

Add 12 oz per 30 minutes of moderate exercise.

Climate
Life stage
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How this is calculated

oz/day = 0.5 × lb + 12 × (activity_min ÷ 30) + climate_adjustment + life_stage_adjustment

  • Climate: hot-humid +16 oz, hot-dry +12 oz, temperate / cold 0.
  • Life stage: pregnant +8 oz, breastfeeding +24 oz.
  • Conversions: 1 fl oz = 29.5735 mL; 1 cup = 8 fl oz; 1 bottle ≈ 16.9 fl oz.

How we choose and check our formulas