The Boston Marathon is 26 miles 385 yards long, which is 42.195 kilometers.

Quick Scoop: How long is the Boston Marathon?

  • Official distance: 26 miles 385 yards.
  • Metric distance: 42.195 km.
  • This matches the standard marathon distance used worldwide, originally set after the 1908 London Olympic marathon and officially adopted in 1921.

So if you’re training or just curious, you can think of the Boston Marathon as the classic “26.2-mile” race from Hopkinton to the finish line at Copley Square in Boston.

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