One haba is equivalent of one shaku (Japanese measure) of Kujirajaku (measuring stick used in kimono-making), which is 37.8 cm (which is 1.25 shaku of carpenter's square used commonly).
1幅は鯨尺1尺（一般的に使われる曲尺の1.25尺・メートル法では37.8センチメートル）に相当する。