Previous Page...   Printer Version Science Constants - Acre Symbol: Value: 4046.85642240 m2 Category: - Units of Area Description: The acre is a British unit of area, now obsolete. It is reputed to be the area a yoke of oxen could plough in one day. Introduced in England around AD1300.   [ H O M E ] [ S C I E N C E ] [ M A T H S ] [ A S T R O N O M Y ] [ Download ] [ Shop ] [ Contact ] [ About ]