That question is as vague as "How much is a car worth?" a car can be worth $500 or $300,000. Same for an acre. A rural acre is worth much less than an acre residential lot in a gated community. An acre with no access to municipal water or sewer services may be worth less than one with roadside access. An acre which has had a septic installed and has electrical access is worth more than one without.location also dictates price and some variances in location can change the desirability and price by 10's of thousands of dollars.