100 000 B.‑Pengő

This note belongs to the most extreme hyperinflationary episode ever recorded. Hungary's postwar inflation peaked in July 1946 when the daily inflation rate exceeded 200 percent — the monthly rate for July alone was approximately 4.19 × 10¹⁶ percent. The B-pengő (bilpengő) was introduced as a denomination equal to one trillion pengő, meaning this 100,000 B-pengő note represented 10¹⁷ ordinary pengő.

Despite a print run of over twelve million, the notes were functionally obsolete almost immediately upon issue. The forint replaced the entire pengő series on 1 August 1946 at a conversion rate so extreme that no mathematical rounding could make it intuitive.