How much is an acre in US dollars?

Could you please explain to me how one would determine the value of an acre in US dollars? I understand that the price can vary greatly depending on factors such as location, soil quality, and zoning restrictions, but I'm curious about a general approach to estimating this value. Is there a standard formula or method that real estate professionals or investors typically use to arrive at a fair market value for an acre of land? Additionally, how might this value change over time and what factors could potentially influence these fluctuations?