The area measure commonly used in Great Britain and the USA. The dimensions of the English and American acre are slightly different. Both are approximately 4,047 m², which is 40.47 ares (just under 63.5 x 63.5 metres). One hectare thus consists of almost 2.5 acres. In terms of importance and size, the old European acre, yoke and acres are quite similar. See also under acreage and tons.