Southern Upland Way Walking Holidays Bramble Cottage, Midtown, Dallry, Castle Douglas, Scotland, DG7 3UT, GB
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    Naismith's Rule is a rule of thumb that helps in the planning of a walking or hiking expedition by calculating how long it will take to walk the route, including ascents. The rule was devised by William W. Naismith, a Scottish mountaineer, in 1892. The basic rule is as follows:

    Allow 1 hour for every 3 miles (5 km) forward, plus ½ hour for every 1000 feet (300 metres) of ascent.

    When walking in groups, calculate for the speed of the slowest person.
    The basic rule assumes hikers of reasonable fitness, on typical terrain, under normal conditions. It does not account for delays, such as extended breaks for rest or sight-seeing, or for navigational obstacles.