Ferritin-to-Iron Status Calculator

About this calculator

Serum ferritin is the standard blood marker used to gauge the body's stored iron, because ferritin is the protein that binds and stores iron inside cells, and its concentration in blood correlates closely with total-body iron reserves under normal (non-inflammatory) conditions. As a rough clinical rule of thumb, each 1 ng/mL of serum ferritin corresponds to roughly 8-10 mg of storage iron, which lets a single lab value be translated into an estimate of total iron stores rather than just a number on a report.

Clinicians and hematology labs use ferritin levels, interpreted against reference ranges, to categorize a patient's iron status — from depleted stores through normal range up to iron overload — as part of working up anemia, unexplained fatigue, or monitoring conditions like hemochromatosis. Because ferritin is also an acute-phase reactant that rises with inflammation and infection independent of iron levels, it is normally interpreted alongside other markers rather than in isolation, and its context matters as much as the raw number.

This calculator takes your serum ferritin level and returns an interpretation of where it falls relative to standard reference bands, along with an estimate of total storage iron.