A centiare (symbol ca) is a unit of area, equal to 1 square meters, used in some countries for measuring small land areas, usually in combination with ares, e.g. 1a 16ca = 116 m². It is a "non-SI unit currently accepted for use with the International System", according to BIPM. A square metre (US spelling: square meter) is by definition the area enclosed by a square with sides each 1 metre long. ... Cover of brochure The International System of Units. ... The Bureau International des Poids et Mesures (International Bureau of Weights and Measures, or BIPM) is a standards organization, one of the three organizations established to maintain the SI system under the terms of the Metre Convention. ...

Definition

1 centiare = 0.01 ares = 1 square metre = 1 m² = 1 m × 1 m. A square metre (US spelling: square meter) is by definition the area enclosed by a square with sides each 1 metre long. ...

The name is a contraction of the SI prefix centi + are; a centiare is 0.01 ares. An SI prefix is a prefix that can be applied to an SI unit to form a decimal multiple or submultiple. ... Centi (symbol c) is a SI prefix in the SI system of units denoting a factor of 10-2, or 1/100. ... An are (symbol a) is a unit of area, equal to 100 square meters (10 m × 10 m), used for measuring land area. ...

One can write : 1a 16ca for an area of 116m² (ie 1 × 100 m² + 16 × 1 m²)