Historians estimate that roughly 50,000–60,000 lobotomies were performed worldwide , with about 40,000–50,000 in the United States alone , mostly between the late 1930s and mid‑1950s.

Quick Scoop: Key Numbers

  • In the United States , estimates cluster around 40,000–50,000 lobotomies , with the peak year 1949 seeing over 5,000 procedures.
  • In Europe , particularly the UK and Nordic countries , at least 25,000+ lobotomies were carried out (about 17,000 in England and around 9,300 across Denmark, Norway, and Sweden).
  • One of the most notorious practitioners, Walter Freeman , personally performed or supervised more than 3,500 lobotomies, including his transorbital “ice‑pick” variant.

These numbers are estimates , because record‑keeping was inconsistent, many operations were done in closed institutions, and some were never formally reported.

Why The Numbers Are Fuzzy

  • Early psychosurgery often happened in overcrowded asylums, where documentation was incomplete or later lost.
  • Different countries used different diagnostic labels and coding, so not every brain operation was clearly tagged as a “lobotomy.”
  • Some modern historical reviews revise counts upward as new archival material is studied, which is why figures are usually given as approximate ranges.

Context: When And Why They Were Done

  • Lobotomies spread rapidly in the 1940s–early 1950s as a desperate response to severe mental illness and institutional overcrowding, before effective psychiatric medications were widely available.
  • Conditions ranged from what would now be diagnosed as schizophrenia or bipolar disorder to depression, anxiety, and even “behavioral problems,” often without true informed consent.

How History Judges Lobotomies Today

  • Today, lobotomy is widely regarded as a grave ethical failure : many patients were left with serious cognitive and personality changes, lifelong disability, or died from the surgery.
  • Modern psychiatry relies on medication, psychotherapy, and, in rare cases, tightly regulated neurosurgical procedures that are very different from the old lobotomy operations.

TL;DR: When people ask “how many lobotomies were performed?” the best supported answer is on the order of tens of thousands globally, with around 40,000–50,000 in the U.S. alone , mostly in the 1940s–1950s.

Information gathered from public forums or data available on the internet and portrayed here.