Prenatal Vitamin Needs Calculator Formula

Understand the math behind the prenatal vitamin needs calculator. Each variable explained with a worked example.

Use the Prenatal Vitamin Needs Calculator

Formulas Used

Folate / Folic Acid

folate_mcg = 600

Iron

iron_mg = 27

Calcium

calcium_mg = age <= 18 ? 1300 : 1000

Vitamin D

vitamin_d_iu = 600

DHA (Omega-3)

dha_mg = 200

Extra Daily Calories

extra_calories = trimester == 1 ? 0 : (trimester == 2 ? 340 : 450)

Variables

VariableDescriptionDefault
trimesterTrimester2
ageAge(years)28

How It Works

Key Prenatal Nutrient Needs

| Nutrient | Daily Amount | Why | |---|---|---| | Folic Acid | 600 mcg | Prevents neural tube defects | | Iron | 27 mg | Supports increased blood volume | | Calcium | 1,000 mg | Builds baby's bones and teeth | | Vitamin D | 600 IU | Aids calcium absorption | | DHA | 200 mg | Brain and eye development |

Extra Calories by Trimester

  • First: No extra needed
  • Second: +340 kcal/day
  • Third: +450 kcal/day

    • Worked Example

    A 28-year-old in her second trimester.

    trimester = 2age = 28
    1. 01Folic acid = 600 mcg DFE
    2. 02Iron = 27 mg
    3. 03Calcium = 1,000 mg (age > 18)
    4. 04Extra calories = 340 kcal/day (2nd trimester)

    Ready to run the numbers?

    Open Prenatal Vitamin Needs Calculator