Australian Flags come in many sizes.
600 x 300 (2ft) is the size flown on boats up to 10 mtrs in length and also used as a Courtesy Flag on boats when visiting other countries. (Australian Made)
900 x 450 (1yd) is the size flown on boats between 10 and 14 mtrs (Australian Made)
1500 x 750mm (1.8yd) a little smaller than the 'standard flag pole flag' (Made in China)
1800 x 900mm (2yd) is standard flag size for a 6mtr flag pole at homes and schools (Australian Made)