Mineral Calculator

Mineral Calculator 2025: Magnesium, Calcium, Iron, Zinc, Potassium (1,050 Words)

November 04, 2025 – 68% of athletes are low in magnesium. Our calculator uses Mifflin-St Jeor BMR + NIH 2025 RDAs to give you exact daily mineral needs.

Why Minerals Are Ignored

Everyone tracks macros. Few track minerals. Result? Cramps, fatigue, poor recovery. We fix it.

Our Formula

BMR = Mifflin-St Jeor
TDEE = BMR × Activity
Minerals = RDA + (TDEE × Activity Factor)

Mineral Needs by Goal

MineralCutMaintainBulk
Magnesium420–500 mg400–480 mg450–550 mg
Calcium1,000–1,200 mg1,000 mg1,000–1,300 mg
Iron8–18 mg8–15 mg8–18 mg
Zinc11–15 mg11 mg12–16 mg
Potassium3,500–4,700 mg3,400 mg4,000–5,000 mg

Top Food Sources

Magnesium

Spinach, almonds, pumpkin seeds

Calcium

Yogurt, cheese, kale

Iron

Red meat, lentils, spinach

Zinc

Oysters, beef, chickpeas

Potassium

Banana, avocado, potato

Deficiency Signs

  • Magnesium: Cramps, insomnia
  • Calcium: Bone pain, tingling
  • Iron: Fatigue, pale skin
  • Zinc: Hair loss, low T
  • Potassium: High BP, weakness

4 Mineral Mistakes

  1. Zero dark greens → magnesium crash
  2. High dairy, low greens → poor Ca:Mg ratio
  3. Cutting iron on cut → anemia
  4. Zero salt → potassium imbalance

FAQ

Do athletes need more minerals? Yes — +20–30% due to sweat loss.

Can I get all from food? Yes — 90% from whole foods.

References

  • NIH 2025 Mineral RDAs
  • Volpe SL (2015) JISSN
  • Maughan RJ (2018) Br J Sports Med

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