Reference

Pace Calculator

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What is Ultra Running?

UltraRunning is devoted to covering the sport of long distance running, also known as ultramarathoning, or, as we prefer, ultrarunning. How far is “a long distance”? The standard definition is anything past the marathon, or 26.2 miles. However, the shortest standard distance that is considered an ultra is the 50 kilometer distance, or 31.07 miles. Other

National Records for 100km

National Records for 100km, complied by Franco Anichini as of December 1, 2009  

All-Time North American Best 100-km Performances

Below is a listing of the all-time top performances at 100-km for North American residents. Thanks to Franco Anichini for the compilation of most of this data. Updated April 23, 2012

All-Time North American Ultra Lists

Below we publish a list of the all-time best modern-day North American performers for various standard ultra distances. In a few cases the runners concerned are citizens of countries other than their country of residence; where we know that information we list their citizenship in parentheses. This list attempts to contain all residents of North