Iron Intake Calculator 2026 | Daily Iron Requirement & Deficiency Risk — Daily Health Tools
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Find your personalised daily iron requirement based on your age, gender, life stage, and diet type. Get your deficiency risk score, top food sources, absorption tips, and a shareable result card.
How Much Iron Do You Actually Need?
Iron deficiency is the most common nutritional deficiency in the world. The World Health Organization estimates that around 2 billion people globally are affected. It is particularly prevalent among women of childbearing age, pregnant women, infants, teenagers, and people following plant-based diets.
Heme vs Non-Heme Iron — Why the Source Matters
Not all dietary iron is equal. There are two types and your body treats them very differently.
Heme iron comes from animal sources — red meat, poultry, and fish. It is absorbed directly by the intestinal cells at a rate of around 15–35%. Nothing you eat alongside it significantly reduces this absorption. It is the most bioavailable form of iron available.
Non-heme iron comes from plant foods — legumes, leafy greens, nuts, seeds, and grains. It is absorbed at only 2–20%, and crucially, several common foods and drinks can dramatically reduce even that low absorption rate. Tea, coffee, calcium, and high-fibre foods all inhibit non-heme iron absorption when consumed at the same time.
This is why vegetarians and vegans are advised to consume significantly more iron — not because plant foods lack iron, but because the body absorbs a much smaller fraction of what they provide.
Iron During Pregnancy
Pregnancy increases iron needs from 18mg to 27mg per day — a 50% increase. This is one of the largest nutritional increases required during pregnancy. The reasons are substantial: blood volume increases by nearly 50% during pregnancy, the growing baby builds its own iron stores in the third trimester, and the placenta has significant iron requirements of its own.
Iron deficiency during pregnancy is associated with premature birth, low birth weight, and increased risk of maternal mortality. Most prenatal vitamins contain iron, but women with heavy pre-pregnancy periods or low dietary iron often need additional supplementation. A blood test at your first antenatal appointment will check your iron stores.
Signs You May Be Iron Deficient
- Fatigue and weakness — the most common symptom; iron is needed to make haemoglobin that carries oxygen to muscles and tissues
- Pale skin, pale inner eyelids, or pale gums — reflects reduced haemoglobin in the blood
- Shortness of breath on exertion — less oxygen delivery means harder breathing during activity
- Dizziness and headaches — reduced oxygen to the brain
- Cold hands and feet — poor circulation from reduced red blood cell production
- Brittle nails or spoon-shaped nails (koilonychia)
- Pica — unusual cravings for ice, dirt, or non-food items; strongly associated with iron deficiency
- Restless legs syndrome — iron is involved in dopamine pathways that regulate leg movement during sleep
How to Maximise Iron Absorption
Pair iron with Vitamin C. Consuming Vitamin C alongside non-heme iron can increase absorption by up to 67%. A glass of orange juice with lentil soup, or bell pepper strips with hummus, makes a meaningful difference.
Avoid tea, coffee, and red wine near iron-rich meals. Tannins in these drinks bind to iron and prevent absorption. Wait at least one hour after an iron-rich meal before drinking tea or coffee.
Separate iron from calcium. Calcium directly competes with iron for absorption. If you take calcium supplements, take them at a different time of day from your iron-rich meals or supplements.
Cook in a cast iron pan. Particularly when cooking acidic foods like tomato sauce, small amounts of iron leach from the pan into the food — a simple and effective way to add modest amounts of iron.
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