Mineral Intake Calculator
See how much calcium, magnesium, sodium and potassium you actually get from your bottled water of choice — and what percentage of daily value that represents.
Gerolsteiner
Source: Volcanic Eifel · pH 5.9 · TDS 2500 mg/LCalcium
696 mg
70% DV
Magnesium
216 mg
54% DV
Sodium
236 mg
10% DV (vs upper limit)
Potassium
22 mg
1% DV
Bicarbonate (HCO₃⁻)
3632 mg
No formal daily value — supports alkaline buffering and digestion.
How the calculation works
Each value = brand's published mineral content (mg/L) × your daily volume in litres. Daily values follow FDA reference intakes for adults: calcium 1000 mg, magnesium 400 mg, potassium 3500 mg. Sodium uses the 2300 mg upper limit.
Mineral-rich waters like Gerolsteiner, Contrex and Borjomi can cover a meaningful share of daily calcium and magnesium needs at typical hydration volumes. Purified or very low TDS waters contribute almost nothing.
