The Washington Monument is approximately 555 feet 5 1/8 inches (about 169.05 meters) tall. This measurement is based on the most recent official surveys and is widely accepted by sources including the U.S. National Park Service and the National Geodetic Survey

. The monument stands as the tallest predominantly stone structure and the tallest obelisk in the world. Its base measures about 55 feet (16.8 meters) wide

. The slight variations in reported height (e.g., 554 feet 7+11/32 inches vs. 555 feet 5 1/8 inches) come from different measurement standards and updates over time, but the commonly cited height is around 555 feet.