Daily Iron Intake Calculator
Determine your recommended dietary allowance (RDA) for elemental iron tailored to your biological sex, life stage, pregnancy status, and dietary choices.
| Life Stage | Age | Iron RDA (mg/day) | Upper Limit (mg/day) |
|---|---|---|---|
| Infants | 0-6 months | 0.27* (AI) | 40 |
| Infants | 7-12 months | 11 | 40 |
| Children | 1-3 years | 7 | 40 |
| Children | 4-8 years | 10 | 40 |
| Children | 9-13 years | 8 | 40 |
| Males | 14-18 years | 11 | 45 |
| Males | 19-50 years | 8 | 45 |
| Males | 51+ years | 8 | 45 |
| Females | 14-18 years | 15 | 45 |
| Females | 19-50 years | 18 | 45 |
| Females | 51+ years | 8 | 45 |
| Pregnancy | All ages | 27 | 45 |
| Lactation | 14-18 years | 10 | 45 |
| Lactation | 19-50 years | 9 | 45 |
*AI = Adequate Intake (no RDA established). Source: NIH ODS, 2024. Upper limit applies to supplemental iron only.
Iron Sources
Heme Iron (High Bioavailability: 15-35%)
- Red meat (beef, lamb, pork)
- Organ meats (liver, kidney)
- Poultry (chicken, turkey)
- Fish and shellfish (clams, oysters, sardines)
Non-Heme Iron (Lower Bioavailability: 2-20%)
- Legumes (lentils, beans, chickpeas)
- Tofu and tempeh
- Dark leafy greens (spinach, kale)
- Fortified cereals and grains
- Nuts and seeds (pumpkin seeds, cashews)
- Dried fruits (raisins, apricots)
Enhancers of Non-Heme Iron Absorption
- Vitamin C (citrus, bell peppers, tomatoes)
- Meat, fish, poultry (MPF factor)
- Fermented foods
Inhibitors of Non-Heme Iron Absorption
- Phytates (whole grains, legumes)
- Polyphenols (tea, coffee, wine)
- Calcium supplements with meals
- Egg whites
What Is a Daily Iron Intake Calculator?
A Daily Iron Intake Calculator is a hematologic and nutritional reference calculator designed to translate blood panel units and compute daily micronutrient requirements. It assists users in understanding normal laboratory ranges for red blood cell indices and elemental dietary intake to maintain optimal oxygen delivery and physiological energy metabolism.
How to Use This Calculator
- Select your biological sex, age group, and pregnancy status.
- Indicate your primary diet style (omnivore or strict vegetarian/vegan).
- Click 'Calculate Iron Intake' to receive your personalized daily elemental iron target in milligrams.
How This Calculator Works
Calculates dietary iron needs based on National Institutes of Health (NIH) Office of Dietary Supplements guidelines. Non-pregnant women aged 19–50 require 18 mg/day, men require 8 mg/day, and pregnant women require 27 mg/day. For strict vegetarians and vegans, the RDA is increased by 1.8x due to lower bioavailability of non-heme iron.
Understanding Your Results
Meeting your target helps sustain optimal erythropoiesis, cellular energy metabolism, and oxygen delivery. High-iron whole foods include lean beef, poultry, lentils, spinach, fortified cereals, and pumpkin seeds.
Frequently Asked Questions
What is the difference between heme and non-heme iron?
Heme iron comes from animal hemoglobin and myoglobin (meat, poultry, seafood) and has an absorption rate of 15–35%. Non-heme iron is found in plant foods and fortified products, with an absorption rate of 2–20%.
How can I enhance non-heme iron absorption?
Consume non-heme iron sources alongside foods rich in Vitamin C (ascorbic acid), like bell peppers, citrus fruits, or tomatoes. Avoid drinking coffee, tea, or consuming high-calcium supplements simultaneously, as they inhibit iron uptake.
What is the Tolerable Upper Intake Level (UL) for iron?
For adults aged 19 and older, the Tolerable Upper Intake Level (UL) for elemental iron from all sources is 45 mg per day, above which gastrointestinal distress and toxicity risks increase unless medically supervised.
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Important Limitations & Medical Disclaimer
Notice: Dietary recommendations are general nutritional benchmarks. Individuals with diagnosed iron deficiency anemia or hemochromatosis require specific physician guidance and targeted blood monitoring.