Convert 6.4 Acres to Square meters (acre to m2) with our conversion calculator and conversion tables. To convert 6.4 acre to m2 use direct conversion formula below. 6.4 acre = 25900.8 m2. You also can convert 6.4 Acres to other Area (popular) units. 6.4 acres to square meters. How many square meters in 6.4 acres? 6.4 acres is equal to 25899.881103 square meters. This page provides you how to convert between acres and square meters with conversion factor. 6.4 ac = 25899.881103 m2; How many acres in 6.4 square meters? — 6.4 m2 = 0.0015814744 ac; How to convert 6.4 ac to m2? 4cfGF.