尼史密夫定律

尼史密夫定律（）是一种用於估算山地行程时间的方法及定律。该定律得名于苏格兰登山家 William Wilson Naismith（1856－1935）。

計算方法
尼史密夫定律：

平路時間+爬升時間=預計所需時間

• 平路每小時可走4公里
• 每爬升600公尺加1小時

外部連結

• [http://www.informaworld.com/smpp/content~db=all~content=a773450587 Route choice in mountain navigation, Naismith's rule, and the equivalence of distance and climb, Journal of Sports Sciences vol. 25, pages 719 - 726.]
• [http://www.sigmadewe.com/fileadmin/user_upload/pdf-Dateien/Bergaufgehen_engl.pdf About walking uphill: time required, energy consumption and the zigzag transition]
• [http://www.geog.leeds.ac.uk/papers/98-7/Modelling Naismith's Rule]
• [https://web.archive.org/web/20101003155107/http://www.wildwalks.com/bushcraft/technical-stuff/naismith-s-rule-estimate-walking-time.html An online calculator and Nomogram]
• [https://web.archive.org/web/20150610204527/http://www.mudandroutes.com/archives/24538 Naismith's Rule and Route Timing]
• [http://www.mudandroutes.com/archives/24547 Tranter's Correction - is it still relevant?]