Metres above sea level

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Redirected here: feet above sea level; AMSL means "above mean sea level", and may be used for heights specified in any units.

Metres above mean sea level (MAMSL) or simply metres above sea level (MASL or m a.s.l.) is a standard[citation needed] metric measurement in metres of the elevation or altitude of a location in reference to a historic mean sea level. Mean sea levels are affected by climate change and other factors and change over time. For this and other reasons, recorded measurements of elevation above sea level might differ from the actual elevation of a given location over sea level at a given moment.


Metres above sea level is the standard measurement of the elevation or altitude of:

How it is determined[edit]

The elevation or altitude in metres above sea level of a location, object, or point can be determined in a number of ways. The most common include:

Accurate measurement of historical mean sea levels is complex. Land mass subsidence (as occurs naturally in some islands) can give the appearance of rising sea levels. Conversely, markings on land masses that are uplifted due to geological processes can suggest a lowering of mean sea level.

Other measurement systems[edit]

Feet above sea level is the most common analogue for metres above sea level in the American measurement system.


Metres above sea level is commonly abbreviated mamsl or MAMSL, based on the abbreviation AMSL for above mean sea level. Other abbreviations are m.a.s.l.[1] and MASL.[2]

See also[edit]


  1. ^ Ricardo Bressani, Ricardo; Carlos Chon (1996). "Effects of altitude above sea level on the cooking time and nutritional value of common beans" (PDF). Plant Foods for Human Nutrition (Formerly Qualitas Plantarum). 49 (1): 53–61. doi:10.1007/BF01092522. Retrieved 2007-05-06. 
  2. ^ "Meters above Sea Level - What does MSL stand for? Acronyms and abbreviations by The Free Online Dictionary.". Retrieved 2007-05-06.