The iceberg that hit the Titanic is estimated to have been roughly 15–30 meters (50–100 feet) high above the water and about 60–120 meters (200–400 feet) long at the time of the collision.

Quick Scoop

Basic size estimates

Most historians and researchers rely on survivor testimonies and later scientific reconstructions to estimate the iceberg’s dimensions.

  • Height above water: about 50–100 feet (15–30 meters).
  • Length: about 200–400 feet (60–120 meters).
  • Only about 1/10 of an iceberg is visible above water, so the bulk of this mass was hidden below the surface.

Underwater bulk and mass

Because most of the iceberg was underwater, its true size was much larger than what crew and passengers could see.

  • Depth below water is estimated at roughly 90–185 meters (295–607 feet), based on typical iceberg geometry and the reported visible height.
  • Modern reconstructions suggest a total mass on the order of 1.5–2 million tons by the time it struck Titanic.

How big was it originally?

Glaciologists think the iceberg started as part of a much larger ice mass calved from Greenland about a year or more before the disaster.

  • One estimate suggests the parent iceberg may have been close to a mile long when it first broke off, then shrank during its journey south.
  • By April 1912 it had already been melting for months but was still large enough to inflict a long, ragged gash along Titanic’s starboard side.

Why the numbers differ

Different contemporary reports and later analyses do not all agree, but they fall in the same general range.

  • Survivor accounts vary because of darkness, shock, and viewing angle, so modern studies combine those accounts with known iceberg physics.
  • Some media and popular sources quote larger headline figures (like 400 feet long and over 100 feet above the water), but they still describe essentially the same scale of iceberg.

In today’s discussion

The question “how big was the iceberg that hit the Titanic” remains a popular topic in documentaries, YouTube explainers, and Titanic forums, where people compare survivor descriptions, photographs, and scientific models.

Recent content often emphasizes how a combination of unusual 1912 ice conditions and the iceberg’s shape and orientation turned a large but not unprecedented iceberg into the trigger for one of history’s most infamous maritime disasters.

TL;DR: The iceberg that hit the Titanic was probably about 50–100 feet high above the water, 200–400 feet long, and weighed around a couple of million tons, with most of its bulk hidden beneath the surface.

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