1 acre equates to 4,046.85642 square meters.
1 acre is 4046.873 square metres
1/4 of an acre is about 1,011.7 square meters.
Strictly speaking, it has to be square metres as the units are different (it'd be like comparing seconds to grams). 4,046.85642 metres squared is equal to one acre. Hope this helps!
1m
1.64 m
430cm
400
1500 meters
3,000' is 914.4m
one kilometer
About 0.000247105381 acres are equal to 1 square meter. or ~4000 sqm in one acre