https://jeltsch.org/en/tags/toni-nett/Recent content in Toni Nett on Michael’s DomainHugoen-usCopyright © 2002 - 2026 Michael Jeltsch.Fri, 24 Jul 2026 00:18:18 +0300https://jeltsch.org/en/toni_nett_s_rules/Sat, 16 Sep 2017 00:00:00 +0000https://jeltsch.org/en/toni_nett_s_rules/<p>More than 50 years ago <a href="https://de.wikipedia.org/wiki/Toni_Nett" target="_blank" rel="noopener noreferrer nofollow">Toni Nett&nbsp; <svg class="svg-inline--fa fas fa-up-right-from-square fa-2xs" fill="currentColor" aria-hidden="true" role="img" viewBox="0 0 512 512" overflow="visible"><use href="#fas-up-right-from-square"></use></svg></a> published his book <em>Der Lauf</em>. In the book, he presented thumb rules to calculate possible personal running records for common distances for middle and long distances. The possible personal bests are calculated based on known performances on the next shorter distance. <a href="https://en.wikipedia.org/wiki/Manfred_Steffny" target="_blank" rel="noopener noreferrer nofollow">Manfred Steffny&nbsp; <svg class="svg-inline--fa fas fa-up-right-from-square fa-2xs" fill="currentColor" aria-hidden="true" role="img" viewBox="0 0 512 512" overflow="visible"><use href="#fas-up-right-from-square"></use></svg></a> extended Toni Nett&rsquo;s rules to cover the marathon and the 100 km. He found these rules surprisingly accurate when comparing personal bests of hundreds of runners of different levels from beginner to world champion. I have been writing about these thumb rules previously <a href="https://jeltsch.org/en/tags/running/">here</a> . Now I made a small php script that does the calculation for you.</p>