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Iron Store Estimator (Ferritin)

Written by the Elysia Tools team · Last updated：2026-08-08

This tool is for informational purposes only and does not constitute medical, financial, or legal advice; consult a qualified professional for advice.

Estimate total body iron stores from serum ferritin. Size-independent rule: stored iron (mg) ≈ ferritin (µg/L) × 10. Body-weight estimate (better across body habitus): stored iron (mg) ≈ ferritin × weight(kg) × 0.0024 (Walters 1973). Adult ferritin reference: men ~30–300 µg/L, women ~15–150 µg/L. Ferritin < 30 µg/L (men) or < 15 µg/L (women) strongly indicates iron deficiency; < 100 µg/L in an inflammatory state does not exclude it. Ferritin > 300 µg/L (men) / > 200 µg/L (women) with TSAT > 45–50% suggests iron overload (hereditary hemochromatosis, dysmetabolic iron overload, iron-loading anemias, transfusions, chronic liver disease); > 1000 µg/L warrants evaluation of hemochromatosis, iron-loading anemias, or hyperferritinemic syndromes. Ferritin is an acute-phase reactant — interpret with TSAT and CRP. Derived from Camaschella 2019, Adams NEJM 2005, and WHO 2020. Not medical advice.

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Tool usage guide

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Key facts

Category
Health
Input types
number, select
Output type
json
Sample coverage
4
API ready
Yes

Overview

The Iron Store Estimator uses serum ferritin to estimate stored body iron in milligrams. Choose a size-independent calculation or an optional body-weight method, and review the ferritin category using sex-specific adult reference thresholds. This tool is for estimation only and is not medical advice.

When to use

  • Estimate stored iron from a measured serum ferritin value.

© 2026 Elysia Tools. All rights reserved.

Compare the size-independent and body-weight estimation methods when body weight is available.
  • Review whether ferritin is low, within the stated adult reference range, or elevated based on the selected sex.

    • How it works

    1. 1Enter serum ferritin in µg/L; this unit is equivalent to ng/mL.
    2. 2Optionally enter body weight, select sex for reference thresholds, and choose an estimation method.
    3. 3The size-independent method calculates stored iron as ferritin × 10.
    4. 4The body-weight method calculates stored iron as ferritin × weight × 0.0024 and rounds the result to the selected decimal places.

    Use cases

    • Estimate depleted iron stores when ferritin is below the stated adult reference threshold.
    • Calculate an approximate stored-iron value for tracking ferritin results over time.
    • Flag elevated ferritin for further interpretation alongside TSAT, CRP, and relevant clinical information.

    Examples

    1. Estimating depleted iron stores

    Adult woman with heavy menstrual bleeding

    Background

    A 35-year-old woman has a serum ferritin result of 12 µg/L, below the stated female threshold of 15 µg/L.

    Problem

    Estimate the approximate stored iron and identify the ferritin category.

    How to use

    Enter ferritin as 12, select Female, choose the Size-independent method, and set decimal places to 1.

    ferritin: 12; sex: female; method: size; decimalPlaces: 1

    Outcome

    The tool estimates stored iron at approximately 120 mg and categorizes the result as Iron deficiency.

    2. Reviewing markedly elevated ferritin

    Adult man being evaluated for possible iron overload

    Background

    A man has ferritin of 900 µg/L and weighs 80 kg. The example context also includes TSAT above 50%, which may suggest iron overload.

    Problem

    Calculate a body-weight-based estimate while recognizing that high ferritin requires clinical evaluation.

    How to use

    Enter ferritin as 900, weight as 80 kg, select Male, choose the Body-weight method, and set decimal places to 1.

    ferritin: 900; weight: 80; sex: male; method: weight; decimalPlaces: 1

    Outcome

    The tool estimates stored iron at approximately 172.8 mg and categorizes the result as Elevated ferritin — consider iron overload or inflammation.

    FAQ

    What does this calculator estimate?

    It estimates stored body iron in milligrams from a serum ferritin result.

    Which ferritin unit should I enter?

    Enter serum ferritin in µg/L, which is numerically equivalent to ng/mL.

    Do I need to enter body weight?

    No. Weight is optional and is required only for the body-weight estimation method.

    How are ferritin results categorized?

    The tool uses sex-specific thresholds: deficiency is strongly indicated below 30 µg/L in men or 15 µg/L in women; higher values may be categorized as elevated.

    Can ferritin alone diagnose iron overload or deficiency?

    No. Ferritin is an acute-phase reactant, so results should be interpreted with clinical context and tests such as TSAT and CRP.

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