As a result, naihosei (the way of measuring based upon the inner size of pillar) was created and tatami mat was standardized as the longer side was 1.909 m and the shorter side was 0.93 m.
このため内法制（柱の内がわの寸法を基準とする）が生まれ、長手が六尺三寸、短手が三尺一寸と規格化されていった。