title: 5 Metre
text: # 5 Metre
  
  5 Metre is a development sailing class of French origin.
  
  ## History
  
  The 5 Metre rule was created in France in 1929 and not a according of the International rule in contrast to other Metre yachts.
  
  ### The formula
  
  The measurement formula is given in the 2021 International Five Metre Rating Rules:
  
      $5.000{\mbox{ metres}}={\frac {L+{\sqrt[{2}]{S}}-F-{\frac {B}{2}}}{2}}$
  
  where
  
  * $L$ = length for rating (as defined by rule 3.4)
  * $S$ = measured sail area
  * $F$ = freeboard in metres (as defined by rule 3.5)
  * $B$ = width in metres (as defined by rule 3.6)
  