There is a theory stating that the territorial value of his own land right before the Battle of Sekigahara, presented as 580,000 koku, had been calculated with the outdated measurement unit used before the scale and measurement revision, which was based on the unit of 1 tan (991.74m²) equal to 360 bu (1 bu was 3.3m²).
政宗の関ヶ原直前の所領58万石は度量衡改定以前の一反三百六十歩で計算されたものという説がある。