Daily Iron Requirements by Sex & Age
Daily iron requirements are based on population studies (NHANES, WHO) and reviewed regularly to keep you current. These reference values provide a framework for understanding your results, but your personal health context always takes priority. Men need 8mg, women need 18mg, and pregnant women need 27mg of iron per day. Values are current as of 2026 and reviewed periodically.
When to use this calculator
- Technical calculations related to daily iron requirements by sex and age
- Students and healthcare professionals
- Validate theoretical results before applying them
- Teaching and learning the concept
- Quick reference in healthcare projects
Calculation Example
- Typical values
- Result
How it works
1 min readNormal health reference values come from large population studies (NHANES, WHO, CDC). They vary by age, sex, ethnicity, and region. These are guidelines; your personal medical history always takes priority.
How It's Calculated
Men: 8mg, Women: 18mg, Pregnant women: 27mg per day.
This calculator applies the formula with your entered values, checking typical ranges and alerting you to values outside normal recommendations.
Normal Reference Values
| Parameter | Normal Adult Range |
|---|---|
| Blood Pressure | <120/80 mmHg |
| Resting Heart Rate | 60-100 bpm |
| Body Temperature | 36.1-37.2°C |
| Oxygen Saturation (SpO2) | 95-100% |
| Fasting Blood Glucose | 70-100 mg/dL |
| HbA1c | <5.7% |
| Total Cholesterol | <200 mg/dL |
| LDL Cholesterol | <100 mg/dL |
| HDL Cholesterol | >40 (Men) / >50 (Women) |
Final Notes
This calculation is a reference guide only. For critical decisions (financial, medical, legal), consult a qualified healthcare professional. Values are current as of 2026 and reviewed periodically.
Frequently asked questions
How much iron do I need daily?
Adult men need 8mg per day, adult women need 18mg per day, and pregnant women need 27mg per day according to WHO guidelines.
Why do women need more iron than men?
Women of reproductive age require more iron due to menstrual blood loss. Iron needs decrease after menopause.
How much iron do pregnant women need?
Pregnant women need 27mg of iron daily to support fetal development and increased blood volume during pregnancy.
What are signs of iron deficiency?
Symptoms include fatigue, weakness, shortness of breath, dizziness, pale skin, headaches, and difficulty concentrating.
What are good sources of dietary iron?
Red meat, poultry, fish, legumes, fortified cereals, dark leafy greens, and nuts are excellent sources. Pairing with vitamin C increases absorption.
Is this calculator accurate for medical diagnosis?
This is a reference guide only. For medical diagnosis or treatment decisions, consult a healthcare professional and get a blood test.
Can you take too much iron?
Yes. Excess iron can damage organs over time. Never exceed recommended amounts without medical supervision, and always take supplements as directed by a doctor.
How is iron deficiency diagnosed?
Through blood tests measuring serum iron, ferritin, and hemoglobin levels. Your doctor will interpret results in your specific health context.
Do medications affect iron absorption?
Yes. Many medications including antacids and certain antibiotics can interfere with iron absorption. Inform your healthcare provider about all medications you take.