We get this from our neighbours the English who use this very old measure. Indeed, the foot is the unit of length corresponding to the length of a human foot. That's about 30 cm.
Since 1960, one foot has corresponded exactly to 30.48 cm.
1 foot = 30.48 cm
The foot is divided into 12 inches.
1 foot = 12 inches
The symbol is ' (apostrophe) or ft (for foot). The thumb symbol is" (quotation mark). That's why the length of a 21 feet 6 inches boat is 21'6" (or 6.55 m, single no?).
To find your way around and get an idea of the length of a boat, you can divide the length in feet by 3 to have approximately one length in meters. Thus a 21-foot boat is about 7 m long.
If the foot is used in water sports, it is also used in aeronautics. Indeed, the altitude in particular is always given in feet. The captain will say, "We are currently flying at 10,000 feet.
The yards continue to designate their production in feet. Thus the new Fountaine-Pajot will be a 47 feet (14.32 m) or the Sun Odyssey 550 is a 55 feet. Be careful, don't be fooled. The building sites do not always use the foot for their appellation. This is often the case in motor boats. Thus the Merry Fisher 750 measures 7.50 m, not 75 feet..
Conversion table from feet to meters
| 12 feet | 3,66 m |
| 15 feet | 4,57 m |
| 18 feet | 5,49 m |
| 20 feet | 6,10 m |
| 21 feet | 6,40 m |
| 22 feet | 6,70 m |
| 25 feet | 7,62 m |
| 28 feet | 8,53 m |
| 30 feet | 9,14 m |
| 35 feet | 10,67 m |
| 38 feet | 11,58 m |
| 40 feet | 12,19 m |
| 45 feet | 13,72 m |
| 50 feet | 15,24 m |
| 55 feet | 16,76 m |
| 60 feet | 18,29 m |
| 70 feet | 21,34 m |
| 80 feet | 24,38 m |
| 90 feet | 27,43 m |
| 100 feet | 30,48 m |
